PHP | filter_list() Function Last Updated : 11 Feb, 2019 Comments Improve Suggest changes Like Article Like Report The filter_list() function is an inbuilt function in PHP which is used to returns the list of all supported filters. Syntax: array filter_list( void ) Parameters: This function does not accepts any parameters. Return Values: It returns an array containing all names of supported filters. If it returns an empty array then it does not contains any filters. The filter id can be obtained by filter_id() function. Note: This function available for PHP 5.2.0 and newer versions. Below examples illustrate the filter_id() function in PHP: Example 1: php <?php print_r(filter_list()); ?> Output: Array ( [0] => int [1] => boolean [2] => float [3] => validate_regexp [4] => validate_domain [5] => validate_url [6] => validate_email [7] => validate_ip [8] => validate_mac [9] => string [10] => stripped [11] => encoded [12] => special_chars [13] => full_special_chars [14] => unsafe_raw [15] => email [16] => url [17] => number_int [18] => number_float [19] => magic_quotes [20] => callback ) Example 2: It display the associated id of all the filters in a single list. php <?php // Array filter function assign to a variable $arr = filter_list(); // Use loop to display the key and its value while (list ($key, $val) = each ($ar2)) { echo "$key -> $val : ( ".filter_id($val). " ) <br>"; } ?> Output: 0 -> int : ( 257 ) 1 -> boolean : ( 258 ) 2 -> float : ( 259 ) 3 -> validate_regexp : ( 272 ) 4 -> validate_domain : ( 277 ) 5 -> validate_url : ( 273 ) 6 -> validate_email : ( 274 ) 7 -> validate_ip : ( 275 ) 8 -> validate_mac : ( 276 ) 9 -> string : ( 513 ) 10 -> stripped : ( 513 ) 11 -> encoded : ( 514 ) 12 -> special_chars : ( 515 ) 13 -> full_special_chars : ( 522 ) 14 -> unsafe_raw : ( 516 ) 15 -> email : ( 517 ) 16 -> url : ( 518 ) 17 -> number_int : ( 519 ) 18 -> number_float : ( 520 ) 19 -> magic_quotes : ( 521 ) 20 -> callback : ( 1024 ) References: http://php.net/manual/en/function.filter-list.php Comment More infoAdvertise with us Next Article PHP | filter_list() Function G gekcho Follow Improve Article Tags : Web Technologies PHP PHP-array PHP-function Similar Reads PHP | filter_id() Function The filter_id() function is an inbuilt function in PHP which returns the filter ID of a specified filter name. It is used to get the filter id of the particular filter in PHP by using filter_id function by giving the name of the filter as input and get the associated id to it. Syntax: int filter_id( 2 min read PHP | filter_input() Function The filter_input() is an inbuilt function in PHP which is used to get the specific external variable by name and filter it. This function is used to validate variables from insecure sources, such as user input from form. This function is very much useful to prevent some potential security threat lik 2 min read PHP list() Function The list() function is an inbuilt function in PHP which is used to assign array values to multiple variables at a time. This function will only work on numerical arrays. When the array is assigned to multiple values, then the first element in the array is assigned to the first variable, second to th 2 min read PHP | filter_has_var() function The filter_has_var() function is an inbuilt function in PHP which is used to check whether the variable available or not especially it checks if a variable of a specified input type exist or not. It returns True on success or False on failure. Syntax: bool filter_has_var( $type, $variable_name ) Par 2 min read PHP | Imagick filter() Function The Imagick::filter() function is an inbuilt function in PHP which is used to apply custom convolution kernel to the image. A kernel, convolution matrix, or mask is a small matrix. It is used for blur, sharpen, embossing, edge detection, and many more. Syntax: bool Imagick::filter( $ImagickKernel, $ 1 min read Like