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  1. <?php
  2. $string = "
  3.     <p> some text</p>
  4.     <h3>h3 text1</h3>
  5.     <p> some text</p>
  6.     some text
  7.     <h3>h3 text2</h3>
  8.     <h3>h3 text3</h3>
  9.     ........
  10. ";
  11.  $string = preg_replace_callback(
  12.         '|<h3>(.*?)</h3>|',
  13.         function ($matches)
  14.         {
  15.                //return getSlug($matches[0]);
  16.                return '<a href="#'.$matches[1].'">'.$matches[1].'</a>';
  17.         },
  18.         $string
  19.     );
  20.     echo $string;
  21.  
  22. ?>
  23.  
Success #stdin #stdout 0.01s 52488KB
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    <p> some text</p>
    <a href="#h3 text1">h3 text1</a>
    <p> some text</p>
    some text
    <a href="#h3 text2">h3 text2</a>
    <a href="#h3 text3">h3 text3</a>
    ........
https://ideone.com/qOGcDu
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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