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  1. <?php
  2.  
  3. $s = '10011';
  4. echo preg_replace_callback("/11|10/", function($m) {
  5. 	return $m[0] == "11" ? "10" : "11";
  6. }, $s);
Success #stdin #stdout 0.01s 82944KB
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stdin
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Standard input is empty
stdout
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11010
https://ideone.com/WPiDdc
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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