How to implement search and replace in php regular

In PHP, you can use the regular expression "preg_replace ($pattern, $replacement, $subject, $limit, $count)" to achieve search and replacement.

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php regular search and replacement preg_replace

preg_replace — Perform a regular expression search and replacement

Method description:

preg_replace ( $pattern , $replacement , $subject , $limit , $count)

Search for the part of the subject that matches pattern and replace it with replacement.

$limit, $count parameters are optional

limit: The maximum number of substitutions for each pattern on each subject. The default is -1 (unlimited).

count: If specified, will be filled with the number of completed substitutions.

Return value:

If subject is an array, preg_replace() returns an array, otherwise it returns a string.

If a match is found, the replaced subject is returned, otherwise the unchanged subject is returned. If an error occurs, NULL is returned.

Instance 1:

      
Instance 2:
      
 '{offset}', 'period' => '{period}', 'date' => '{date}' ); $patterns = array( '/{offset}/', '/{period}/', '/{date}/' ); $replacements = array( 33, 'day', '216-11-11' ); $url = preg_replace($patterns, $replacements, $PIWIK_API); //结果： /* $url = array(3) { ["filter_offset"]=> string(2) "33" ["period"]=> string(3) "day" ["date"]=> string(9) "216-11-11" } */
      
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