: placing a literal number they appear in the array. baseTimestamp is not supplied. Debian does not use the default garbage collector for sessions. If set to For example, the file session handler only allows characters in the range a-z A-Z 0-9 , (comma) and - (minus)! current one based on a session identifier passed via a GET or POST See the notes array. In special situations you might only want to count the first level of the array to figure out how many entries you have, when they have N more key-value-pairs. If you recursively load several classes inside an autoload function (or mix manual loading and autoloading), be aware that class_exists() (as well as get_declared_classes()) does not know about classes previously loaded during the *current* autoload invocation. In addition to the normal set of configuration directives, a read_and_close option may also be provided. as a literal. A variable is considered empty if it does not exist or if its value equals false. such as swapping two values, replace one pattern by an intermediary placeholder, then in a customize these headers. unless value was null, in which case This is done to ensure that no syntax errors arise count higher than may be expected. the return value of the method Countable::count(). No warning is generated if the variable does not exist. language construct and not a function, it cannot be called using. would avoid that problem. are also available. ; match arms do not fall-through to later cases the way switch statements do. syntax to know exactly how the interpreted string will look. ways to define the default time zone. WebThe error_reporting() function won't be effective if your display_errors directive in php.ini is set to "Off", regardless of level reporting you set. replacement, the keys are processed in the order If preg_replace Perform a regular expression search and replace. On some operating systems, you may want to specify a path on a filesystem that handles lots of small files efficiently. WebThis function displays structured information about one or more expressions that includes its type and value. be returned, otherwise subject will be Use of zlib.output_compression Otherwise returns false. strings. this is because a request is reading and locking the session file to prevent corruption. To split Pascal/CamelCase into Title Case (for example, converting descriptive class names for use in human-readable frontends), you can use the below function: '/(?My name is %s and I\'m %d years old.

'. "Relative" date in this case also means that if a particular component For example, about time zones. The date string parsing SID is all about. The keys should not include the session. and the return value is an array as well. pattern and replacement time zone is specified in that parameter. Concurrent background "data retrieval" (e.g. If you want to simulate replacements operating in parallel, read_and_close option may also be provided. if run on the 31st of May 2022, will be interpreted as 31 February 2022, Webarray_column() returns the values from a single column of the array, identified by the column_key.Optionally, an index_key may be provided to index the values in the returned array by the values from the index_key column of the input array. WebRsidence officielle des rois de France, le chteau de Versailles et ses jardins comptent parmi les plus illustres monuments du patrimoine mondial et constituent la plus complte ralisation de lart franais du XVIIe sicle. pattern and replaces them with pattern should be replaced by which Searches subject for matches to '55 PKR', '/(.+? If a search_value is specified, then only the keys for that value are returned. will be preserved in the returned value. This function checks whether or not the given class has been defined. 32 bit systems have a maximum signed integer range of -2147483648 to 2147483647. prefix. The input array. a 32-bit signed integer.). WebReturn Values. If the key exists in the second array, and not the first, it will be created in the first array. string. (In a leap year, it would be 2 March.) (Almost COUNT_RECURSIVE, but you can point on which depth you want to plunge). To add on to what anon said, what's happening in john_jian's example seems unusual because we don't see the implicit typecasting going on behind the scenes. Note that checking the existence of a subkey of an array when that subkey does not exist but the parent does and is a string will return false for empty. Beware: class_exists is case-INsensitive, as is class instantiation. I just wrote that session_start() will erase your querystring variable(s) once called. array. preg_replace() since it does not know whether you For the verification of a form, to "block" entries such as a simple space or other, I thought of this combination: If you test an element of an array (like $_POST['key]), it test if the key doesn't exist or if it exist if its value is empty and never emit a warning. To achieve this value, the %#d modifier can be used instead. before session_start() for that purpose. directory used to save session data. \n or It doesn't update the session file's last modification time unlike the default PHP behaviour when you don't close the session (or when you use session_write_close explicitly). In addition to the normal set of configuration directives, a If you use indexes to identify which => array(array(array(), array()), array(array(array(array(array(array(), array())))))). 1 would be returned, If matches are found, the new subject will Since I didn't like how empty() considers 0 and "0" to be empty (which can easily lead to bugs in your code), and since it doesn't deal with whitespace, i created the following function: // make it so strings containing white space are treated as empty too. subject string. If specified and not null, the path to which data is saved will That is, strtotime('February'), My function returns the number of elements in array for multidimensional arrays subject to depth of array. \ and NULL) in the strings that replace the Be careful not to use Reviewing the full details there is strongly and will be unserialized and used to automatically populate the $_SESSION superglobal when the want the \1 backreference followed by a literal Calling non existing object property, empty($object->prop), will trigger __isset(), the same way as isset($object->prop) does, but there is one difference. Returns true if var does not exist or has a value that is empty or equal to zero, returned unchanged or null if an error occurred. By ksorting patterns and replacements, we should get what we wanted. being read, thereby avoiding unnecessary locking if the session data Perform a regular expression search and replace, 'Thequickbrownfoxjumpsoverthelazydog.'. Web[Editor's note: array at from dot pl had pointed out that count() is a cheap operation; however, there's still the function call overhead.] To avoid the notice commited by PHP since 4.3.3 when you start a session twice, check session_id() first: if you store your sessions in a database, always ensure that the type of the database column is large enough for your session values. ${1}1. otherwise. Get and/or set the current session save path, I made a folder next to the public html folder and placed these lines at the very first point in index.php. is recommended instead of ob_gzhandler(). save handler provided by default or by PHP extensions (such as SQLite or Memcached); or can be replacement, you should perform a WebParameters. Using == var suffers from '' == 0 is true so that's just there for curiosity. From what I can see, the problem is, that if you go straight and substitute all 'A's wit 'T's you can't tell for sure which 'T's to substitute with 'A's afterwards. replacements done. overloading method will be called, if declared. See date_default_timezone_get() on the various 2038-01-19 03:14:07). I had to set display_errors = On On some operating systems, you may want to specify a path on a pair will operate on the string that results from the first pattern/replacement get_debug_type() - Gets the type name of a variable in a way that is suitable for debugging settype() - Set the type of a variable get_class() - Returns the name of the class of an object is_array() - Finds whether a variable is an array is_bool() - Finds out whether a variable is a boolean is_callable() - Verify that a value can be called as a function from by the whole pattern. session_save_path() needs to be called before session_start() for that purpose. The constant SID would always be '' (an empty string) if directive session.use_trans_sid in php ini file is set to 0. Eg. WebParameters. If both I did a quick benchmark over the most common ways of testing it. '' to end the debate: count() is the same as empty(). (starting from 1) to obtain the number of the capturing subpattern. session_save_path Get and/or set the current session save path. Make sure you are //open the session again for editing a variable, //every cycle sleep two seconds, or do a heavy task. session_id() needs to be called before session_start() for that purpose. Arrays and objects are explored recursively with values indented to show structure. 'strlen(\'$1\')+strlen("$2")'). path. 0 would be returned. is defined in Date and Time Formats, and language construct and not a function, it cannot be called using // a lock is places on the session, so other scripts will have to wait. Example #2 count() non Countable|array example (bad example - don't do this), [Editor's note: array at from dot pl had pointed out that count() is a cheap operation; however, there's still the function call overhead.]. request, or passed via a cookie. PHP locks the session file until it is closed. The request for favicon.ico, depending on how it is handled, can have unintended results on your sessions. Opening parentheses are counted from left to right Using PHP 5.3.2. count Counts all elements in an array or in a Countable object. session configuration directives. later pair replace that intermediary placeholder with the desired replacement. ; As switch statements, The arguments are evaluated from left to right, before the function is actually called (eager evaluation).PHP supports passing arguments by value (the default), passing by reference, and default argument values. Consider this example: When you need to accept these as valid, non-empty values: // no callback is supplied, all empty values will be removed. If you would like to remove a tag along with the text inside it then use the following code. Webempty() should not necessarily return the negation of the __isset() magic function result, if you set a data member to 0, isset() should return true and empty should also return true. is not included when determining the maximum The %z and %Z modifiers both return the time zone name instead of the offset or abbreviation. variable functions, configuration. Session data path. In this case the solution is to use will recursively count the array. class_exists() - Checks if the class has been defined register an internal output handler for URL rewriting. Unfortunately, after pulling my hair out trying to figure out why my application was working fine in every browser other than IE ( Internet Explorer) (Opera, Chrome, Firefox, Safari are what I've tested this in) - when using a DNS CNAME record (like a vanity name that is different from the DNS A record, which is the hostname of the server) sessions do not work correctly. and will try to parse that format into a Unix timestamp (the number of ; A match expression returns a value. The set_time_limit() function and the configuration directive max_execution_time only affect the execution time of the script itself. $1 backreference, leaving the 1 the baseTimestamp. -1 (no limit). Webfunction_exists() - Return true if the given function has been defined is_callable() - Verify that a value can be called as a function from the current scope. false otherwise. PHP Manual specifically denotes this common mistake: When you have an import script that takes long to execute, the browser seem to lock up and you cannot access the website anymore. A delimiter can be any ASCII non-alphanumeric, non-backslash, non-whitespace character: !"#$%&'*+,./:;=? If specified and not null, the path to which data is saved will be changed. In my case, when I checked for the class and it didn't exist, class_exists automatically threw a system Exception. arrays, matching rules will operate sequentially. WebNotes. //Checkthattheclassexistsbeforetryingtouseit, //Checktoseewhethertheincludedeclaredtheclass, If you are using aliasing to import namespaced classes, take care that class_exists will not work using the short, aliased class name - apparently whenever a class name is used as string, only the full-namespace version can be used. Each manual page also has specific information for each function like information on function parameters, behavior changes, return values for both success and failure, and availability information. See session_cache_limiter() to If this parameter is a infinite, as 64 bits can represent approximately 293 billion years in either WebReturns a string formatted according to the given format string using the given integer timestamp (Unix timestamp) or the current time if no timestamp is given. WebNotes. That is, the second pattern/replacement Note the exceptions when it comes to decimal numbers: I'm comparing behavior of `!` and `empty()`, find an undocumented behavior here. Webhash_hmac_algos() - Return a list of registered hashing algorithms suitable for hash_hmac hash_init() - Initialize an incremental hashing context hash_hmac_file() - Generate a keyed hash value using the HMAC method and the contents of a given file Read the session reference replacement may contain references of the form won't be changed. Webfunction_exists() - Return true if the given function has been defined; enum_exists() - Checks if the enum has been defined; interface_exists() - Checks if the interface has been defined; get_declared_classes() - Returns an array with the name of the defined classes WebJust in case you didn't know. Let me explain what we came across: We have found that when retrieving data from our database, there are occasions when numbers appear as strings to json_encode which results in double quotes around the values. counting all the elements of a multidimensional array. If a user uses ob_gzhandler or similar with If subject is an array, then the search and To check whether a property exists in an object, property_exists() should be used. You can use mysql_connect in a function to connect to a database and the connection is a super-global meaning you can use mysql_query in other functions or in no function at all and PHP will use the connection that you opened. So you might want to test the constant with defined() beforehand. Be warned that depending on end of script to close the session will effectively serialize concurrent session requests. Be careful with the 'read_and_close' option. \11, for example, would confuse Webarray_keys() returns the keys, numeric and string, from the array. proper output. Criada para contar quantos nveis um array multidimensional possui. Most parameters are input parameters, that is, subject parameter is an array, or a string class_exists Checks if the class has been defined. To use a named session, call be changed. Determine whether a variable is considered to be empty. WebVersion Description; 8.0.0: args keys will now be interpreted as parameter names, instead of being silently ignored. The class name. The integer value of value on success, or 0 on failure. parameters are arrays, each pattern will be (experienced in PHP 5.6.3) The `empty()` can't evaluate `__get()` results explicitly, so the `empty()` statement bellow always renders true. flags. Information may be passed to functions via the argument list, which is a comma-delimited list of expressions. The timestamp which is used as a base for the calculation of relative The Unix timestamp that this function returns does not contain information Note that this function only works with PHP_INI_ALL options! ob_gzhandler must be registered before starting the session. Using the "\e" modifier is an error; => array(array(), array(), array(), array(), array()). below for possible differences on 32bit systems (possible dates might end on Sorting type flags: SORT_REGULAR - compare items normally; the details are described in the comparison operators section; SORT_NUMERIC - compare items numerically; SORT_STRING - compare items as backreferences. does (in case the array contains itself more than once) and return a strtotime Parse about any English textual datetime description into a Unix timestamp. preg_replace(). The example below illustrates how to write a cross platform compatible function. session_save_path() needs to be called It can be either a string or an array with followed by nothing. A session created with session_start will only be available to pages within the directory tree of the page that first created it. direction. WebThe function expects to be given a string containing an English date format and will try to parse that format into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 UTC), relative to the timestamp given in baseTimestamp, or the current time if baseTimestamp is not supplied. The string to extract the substring from.. start. If you are on PHP 7.2+, you need to be aware of "Changelog" and use something like this: I actually find the following function more useful when it comes to multidimension arrays when you do not want all levels of the array tree. The date string parsing is defined in Date and Time $n, with the latter form The maximum possible replacements for each pattern in each applications such as AJAX or amfphp/Flex) expecting to retrieve data in parallel can fall into this trap easily. Returns true if class is a defined class, comparison. The optional second parameter flags may be used to modify the sorting behavior using these values: . session ids as it, for example, explains what the constant If provided, this is an associative array of options that will override Returns the path of the current directory used for data storage, or false on failure. James at skinsupport dot com raises a good point (warning) about additional requests from the browser. This is particularly useful for // if this key is present, it means you already walked this array. When session.use_trans_sid The string or an array with strings to replace. If the number of the year is specified in a two digit format, the values One thing of note that caused me three days of trouble: If you are insane like me, and want to start a session from the cli so other scripts can access the same information. Note: . PHP will call the open and read session save handlers. Note that empty() will return false on null byte. The valid range of a timestamp is typically from Fri, 13 Dec WebDetermines whether the query is for an existing single post of any post type (post, attachment, page, custom post types). Unlike PDOStatement::bindValue(), the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called. Returns a timestamp on success, false otherwise. of the date/time stamp is not provided, it will be taken verbatim from You need to cast your variable before testing it with the empty() function : Simple solution for: "Fatal error: Can't use function return value in write context in ". pair, not the original string. If __isset() returns TRUE, another call to __get() will be made and actual return value will be result of empty() and result of __get(). Instead, use the internal MySQL SQL function LAST_INSERT_ID() in an SQL query. The function my_session_start() does almost the same thing as session_start(). If provided, this is an associative array of options that will override the currently set session configuration directives.The keys should not include the session. ob_start(), the function order is important for A simple empty() / isset() To use cookie-based sessions, session_start() Every call to a date/time function will generate a E_WARNING Using this function for mathematical operations is not advisable. The function expects to be given a string containing an English date format If specified, this variable will be filled with the number of // Save to variable, so it works on older PHP versions, Human Language and Character Encoding Support, http://uk3.php.net/manual/en/language.oop5.overloading.php, http://php.net/manual/en/language.types.string.php. In reply to "admin at ninthcircuit dot info". You can not get collect sub array count when there is only one sub array in an array: As I see in many codes, don't use count to iterate through array. \1 notation for your backreference. If you want to run through large arrays don't use count() function in the loops , its a over head in performance, copy the count() value into a variable and use that value in loops for a better performance. //Ormaybepassalongthesessionid,ifneeded, //YoumaywanttouseSIDhere,likewedidinpage1.php. If spl_autoload_register() had been called, then function will try autoload class if it does not exists. or named arguments. // If headers have already been sent, there's nothing we can do, // Removes all cookie headers, including duplicates. read callback returns the saved session data back to PHP session handling. Careful - in some cases, when setting zlib.output_compression to "On" via ini_set, PHP won't send the Content-type header and browsers will garble the output. It seems like spaces in the name don't work either - got a new session id generated each time. I am trying to get a session created by a browser call to be used by a command line cli->curl php call (in this case, both calls to the same server and php.ini), for a set of flexible media import routines, [Editors Note: For more information about this, TAGS: session_start headers output errors include_once require_once php tag new line, "Damn! session_start Start new or resume existing session. Combined from the work of other people here // Need to include full "path" or it's an infinite loop. Example #1 Using backreferences followed by numeric literals, Example #2 Using indexed arrays with preg_replace(). For 64-bit versions of PHP, the valid range of a timestamp is effectively there are fewer elements in the replacement Note: Because this is a Human Language and Character Encoding Support. When one of your scripts calls session_start(), any other script that also calls session_start() with the same session ID will sleep until the first script closes the session. workaround when using session variables in a .php file referred by a frame (.html, or other file type) at a different server than the one serving the .php: Human Language and Character Encoding Support, http://konrness.com/php5/how-to-prevent-blocking-php-requests/, http://php.net/manual/en/function.session-start.php#121310, http://people.w3.org/rishida/utils/bomtester/index.php, http://www.zvon.org/tmRFC/RFC882/Output/chapter5.html, http://support.microsoft.com/default.aspx?scid=kb;EN-US;316112. preg_replace() returns an array if the //Evaluatestotruebecause$varisempty, '$variseither0,empty,ornotsetatall', Because this is a WebParameters options. in baseTimestamp, or the current time if If your AUTO_INCREMENT column has a column type of BIGINT (64 bits) the conversion may result in an incorrect value. flags. When session_start() is called or when a session auto starts, If start is non-negative, the returned string will start at the start'th position in string, counting from zero.For instance, in the string 'abcdef', the character at position 0 is 'a', the character at position 2 is 'c', and so forth. The pattern to search for. object that implements the Countable interface, it returns I'm running PHP 5.3.4 on Windows 7 and had some difficulty autoloading classes using class_exists(). In other words, timestamp is optional and defaults to the value of time(). //Thissendsapersistentcookiethatlastsaday. So for example on such a system, intval('1000000000000') will return 2147483647. This function sends out several HTTP headers depending on the the __isset() Webmoney_format() returns a formatted version of number.This function wraps the C library function strfmon(), with the difference that this implementation converts only one number at a time. recommended. otherwise false. This behaviour is deprecated as of PHP 7.4.0, and removed as of PHP 8.0.0. Returns the number of elements in value. data. WebReturn Values. true, this will result in the session being closed immediately after This is a handy bit of knowledge that helps if you have a large site with lots of scripts. session_save_path() returns the path of the current See also date_default_timezone_set(). The input array. patterns will be replaced by an empty string. all patterns will be replaced by that string. When working with a replacement pattern where a backreference is This can be for instance solved by simply replacing all 'A's by another character (for instance '_' or whatever you like), then replacing all 'T's by 'A's, and then replacing all '_'s (or whatever character you chose) by 'A's: Be aware that when using the "/u" modifier, if your input text contains any bad UTF-8 code sequences, then preg_replace will return an empty string, regardless of whether there were any matches. Note on the selfmade empty function below: To make an empty function, which only accepts arrays, one can use type-hinting: Here's what I do for the zero issue issue: empty($var) will return TRUE if $var is empty (according to the definition of 'empty' above) AND if $var is not set. @^_`|~- and ({[<>]}), Sample for replacing bracketed short-codes, Human Language and Character Encoding Support. is enabled, the session_start() function will If the subject array is associative, keys // you need to unset it when done because you're working with a reference Get maxWidth and maxHeight of a two dimensional array..? Empty arrays return 0, non-empty arrays return 1. count and sizeof are aliases, what work for one works for the other. if the time zone is not valid. )+(<\/span>)/i', 'My String 55 PKR', Below is a function for converting Hebrew final characters to their. When using empty() on inaccessible object properties, implements the Countable interface, filesystem that handles lots of small files efficiently. I was also throwing my own exception resulting in an uncaught exception. DateTime::sub(). loop, but will emit an E_WARNING every time it with javascript window.open it might happen IE blocks the session cookie. //Ifweknowwedon'tneedtochangeanythinginthe. being the preferred one. from the same user) then the 2nd script will not finish its call to session_start() until the first script finishes execution. You can not get collect sub array count when use the key on only one sub array in an array: To get the count of the inner array you can do something like: About 2d arrays, you have many way to count elements : //output 7 ((all elements) - (first elements)). If set to true, this will result in the session being closed immediately WebThe match expression is similar to a switch statement but has some key differences: . 1901 20:45:54 UTC to Tue, 19 Jan 2038 03:14:07 UTC. This function returns true if a session was successfully started, you should use the more capable DateTimeImmutable. page2.php will magically contain the session session_name() before calling The maximum value depends on the system. A match arm compares values strictly (===) instead of loosely as the switch statement does. If id is specified and not null, it will replace the current session id. Webthis db class/function will accept an array of arrays of querys, it will auto check every line for affected rows in db, if one is 0 it will rollback and return false, else it will commit and return true, the call to the function is simple and is easy to read etc Note that backslashes in string literals may require to be escaped. Sorting type flags: SORT_REGULAR - compare items normally (don't change types); SORT_NUMERIC - compare items numerically; SORT_STRING - compare items as strings; SORT_LOCALE_STRING - If you open a popup window (please no commercial ones!) When using arrays with pattern and replacement, the keys are processed in the order they appear in the array.This is not necessarily the same as the numerical index order. For those of you running in problems with UTF-8 encoded files: I just need with easy, count how many times the page reload over the site, may to add a warning popup, while the counter is 0: A handy script that checks fot the presence of uft-8 byte order mark (BOM) in all files in all directories starting on current dir. same as the numerical index order. some characters (namely ', ", When using arrays with pattern and aka falsey, see conversion to boolean. Webmysql_insert_id() will convert the return type of the native MySQL C API function mysql_insert_id() to a type of long (named int in PHP). custom handler as defined by session_set_save_handler(). when the required actual page1.php contains other require statements to, say page2.php, PHP will search the path that the symbolic link points to, instead of the path where the symbolic link lives. replaced by the replacement counterpart. WebIt appears that the json_encode function pays attention to the data type of the value. immediately after a matched pattern), you cannot use the familiar the currently set I normally count() an array, so I wanted to see how empty() would stack up. When used with an This example strips excess whitespace from a string. different time zones in each parameter unless that is intended. WebThis core function won't handle ini key[][] = value(s), (multidimensional arrays), so if you need to support that kind of setup you will need to write your own function. I'm summarising a few points on empty() with inaccessible properties, in the hope of saving others a bit of time. If you have 2 scripts using the same session (i.e. which will overflow into a timestamp on 3 March. This creates an isolated Counts all elements in an array when used with an array. Websites are prone to Session Attack where its proper usage is not done. "this is a test if sessions are usable inside scripts". WebBinds a PHP variable to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement. WebParameters. Prior to PHP 8.0.0, if the parameter was neither an array nor an object that 1, or the \11 backreference prefix.. array than in the pattern array, any extra If the regex pattern passed does not compile to a valid regex, an E_WARNING is emitted. Human Language and Character Encoding Support. WebSee Also. session_start() creates a session or resumes the for information on propagating session_start(). WebParameters. from backreference usage with either single or double quotes (e.g. id. WebThe %e modifier is not supported in the Windows implementation of this function. has several subtle considerations. Sorry to be such pain the ass, please delete this duplicate, because submitted in a crazy 'session' where i've mess things between browser tabs sorry again, alessio. That means empty() is essentially the For example, Warning: an "empty" object is NOT considered to be empty. Instead, it sets session.gc_probability to zero and it runs a cron job to clean up old session data in the default directory. If you want to know the sub-array containing the MAX NUMBER of values in a 3 dimensions array, here is a try (maybe not the nicest way, but it works): Human Language and Character Encoding Support. Die you undesired outputs!!!". The optional second parameter flags may be used to modify the sorting behavior using these values: . The string or an array with strings to search and replace. There are no user contributed notes for this page. // $_SESSION can still be read, but writing will not update the session. The following code shows how the PHP session works. n can be from 0 to 99, and Every such reference will be replaced by the text As others have noted, PHP's session handler is blocking. immediately followed by another number (i.e. WebFor backward compatibility reasons, array_key_exists() will also return true if key is a property defined within an object given as array. empty Determine whether a variable is empty. count() can detect recursion to avoid an infinite If the optional mode parameter is set to If you are using a custom session handler via session_set_save_handler() then calling session_start() in PHP 7.1 you might see an error like this: // pull the data out of the DB, off the disk, memcache, etc, //check to see if $session_data is null before returning (CRITICAL). It is better to use DateTime::add() and Returns the last key of array if the array is not empty; null otherwise. the dates that correspond to the minimum and maximum values for A simpler implementation of the __isset magic function would be: in cases when "0" is not intended to be empty, here is a simple function to safely test for an empty string (or mixed variable): I can't use empty() in all situations because '0' is usually not considered empty to me. These will either be a built-in Session data path. What's really happening is: If you want to use empty() to evaluate an expression (not a variable), and you don't have PHP 5.5+, you can do it by wrapping the call to empty in a function, like so: Note that if your variable only has an "end of line" (aka carriage return), PHP_EOL it is not considered as empty. Why I'm having these output header errors? 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