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  1. <?php
  2.  
  3. $new_class = 'yellow';
  4. echo preg_replace('/(class="[^"]*)/', "$1 $new_class", '<p class="bold">Hello!</p>');
Success #stdin #stdout 0.01s 82944KB
comments (?)
stdin 
Standard input is empty
stdout 
<p class="bold yellow">Hello!</p>
https://ideone.com/YmXmsJ
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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