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:

<?php
$PIWIK_API = &#39;filter_offset={offset}&period={period}&date={date}&#39;;
$patterns = array(
    &#39;/{offset}/&#39;,
    &#39;/{period}/&#39;,
    &#39;/{date}/&#39;
);
$replacements = array(
    33,
    &#39;day&#39;,
    &#39;216-11-11&#39;
);
$url = preg_replace($patterns, $replacements, $PIWIK_API);
//结果： $url = "filter_offset=33&period=day&date=216-11-11"

Instance 2:

<?php
$PIWIK_API = array(
    &#39;filter_offset&#39; => &#39;{offset}&#39;,
    &#39;period&#39; => &#39;{period}&#39;,
    &#39;date&#39; => &#39;{date}&#39;
);
$patterns = array(
    &#39;/{offset}/&#39;,
    &#39;/{period}/&#39;,
    &#39;/{date}/&#39;
);
$replacements = array(
    33,
    &#39;day&#39;,
    &#39;216-11-11&#39;
);
$url = preg_replace($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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