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  1. <?php
  2.  
  3. $text = "<B>FOO</B>";
  4. $text = preg_replace_callback("~(</?)(\w+)([^>]*>)~", function($subs) {
  5. 	return $subs[1] . strtolower($subs[2]) . $subs[3]; 
  6.  }, $text);
  7.  echo $text;
Success #stdin #stdout 0.01s 82944KB
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<b>FOO</b>
https://ideone.com/1rd6Zn
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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