Preg in PHP_ How to replace variable data

php in preg_replace How to replace variable data

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stay php in ,“preg_replace” Function can perform a regular expression search and replace to replace variable data , The grammar is “preg_replace( Specify the mode of search , String or array of strings to replace , The target string or array of strings to search for replacement , The maximum number of times a string can be replaced , The number of times the replacement is executed )”; if subject Is an array, the returned result is an array , Otherwise, return the string .

This article describes the operating environment ：Windows10 System 、PHP8.1 edition 、Dell G3 The computer

php in preg_replace Method of replacing variable data

preg_replace Function to search and replace a regular expression .

grammar

mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

Search for subject Match pattern Part of , With replacement Replace .

Parameter description ：

• $pattern: Patterns to search , It can be a string or an array of strings .

• $replacement: String or array of strings to replace .

• $subject: The target string or array of strings to search for replacement .

• $limit: Optional , For each pattern, for each subject The maximum number of times a string can be replaced . The default is -1（ unlimited ）.

• $count: Optional , The number of times the replacement was performed .

Return value

If subject Is an array , preg_replace() Returns an array , In other cases, a string is returned .

If the match is found , After replacement subject Returned , In other cases Go back to what hasn't changed subject. If an error occurs , return NULL.

Examples are as follows ：

<?php$string = 'The quick brown fox jumped over the lazy dog.';$patterns = array();$patterns[0] = '/quick/';$patterns[1] = '/brown/';$patterns[2] = '/fox/';$replacements = array();$replacements[2] = 'bear';$replacements[1] = 'black';$replacements[0] = 'slow';echo preg_replace($patterns, $replacements, $string);?>

The results are shown below ：

The bear black slow jumped over the lazy dog.

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