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  1. <?php
  2.  
  3. $str = 'WORD1 some text WORD2 and we have WORD1.';
  4. echo preg_replace_callback('~\b(?:WORD1|WORD2)\b~', function ($m) {
  5. 	return $m[0] === "WORD1" ? "WORD2" : "WORD1";
  6. }, $str);
Success #stdin #stdout 0s 82624KB
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Standard input is empty
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WORD2 some text WORD1 and we have WORD2.
https://ideone.com/DFO3Ex
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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