The preg_filter() function is an inbuilt function in PHP which is used to perform a regular expression search and replace the text.
Syntax:
preg_filter( $pattern, $replacement, $subject, $limit, $count )
Parameters: This function accepts five parameters as mention above and describe below.
- $pattern: This parameter contains an string element which is search for and it can be a string or array of string.
- $replacement: It is mandatory parameter which specifies the string or an array with strings to replace.
- $subject: The string or an array with strings to search and replace.
- $limit: This parameter specifies the maximum possible replacements for each pattern.
- $count: It is optional parameter which is used to fill with the number of replacements done.
Return Value: This function returns an array if the subject parameter is an array, or a string otherwise.
Below program illustrates the preg_filter() function in PHP:
Program 1:
<?php   // PHP program to illustrate // preg_filter function $string = 'November 01, 2018'; $pattern = '/(\w+) (\d+), (\d+)/i'; $replacement = '${1} 02, $3';   // print result echo preg_filter($pattern, $replacement, $string); ?> |
Output:
November 02, 2018
Program 2 :
<?php   // PHP program to illustrate preg_filter function $subject = array('1', 'GFG', '2',         'Geeks', '3', 'GCET', 'Contribute', '4'); $pattern = array('/\d/', '/[a-z]/', '/[1a]/'); $replace = array('X:$0', 'Y:$0', 'Z:$0');   echo "Returned Array by preg_filter"; print_r(preg_filter($pattern, $replace, $subject)); ?> |
Output:
Returned Array by preg_filterArray
(
[0] => X:Z:1
[2] => X:2
[3] => GY:eY:eY:kY:s
[4] => X:3
[6] => CY:oY:nY:tY:rY:iY:bY:uY:tY:e
[7] => X:4
)
Reference: http://php.net/manual/en/function.preg-filter.php
