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How to retrieve a substring in PHP that starts and ends with something, and then replace it in PHP?

January 2, 2022

Let’s say I have a string like this:

This is just a test {#3,2,7,9} this is another test {#21,2,11}

How can I retrieve all instances of {#x,y,..} and replace it with a random number it contains?

For example, the string above could become:

This is just a test 2 this is another test 11

>Solution :

Regex match the string inside preg_replace_callback, split the match into array, shuffle it and return.

<?php
$str = 'This is just a test {#3,2,7,9} this is another test {#21,2,11}';

echo preg_replace_callback('/{[#]([\w,]{1,})}/', function ($match)  {
  $numbers = explode(',', $match[1]);
  shuffle($numbers);
  return isset($numbers[0]) ? $numbers[0] : '{#'.$match[0].'}';
}, $str);

See online, https://3v4l.org/luCAT