3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = <<<"MIXED" Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus pulvinar lorem lectus, vel aliquam est blandit accumsan. Maecenas nisi eros, ornare a euismod rutrum, rhoncus a massa. Hello world <b>Goodbye world</b> <h1>Heading</h1> <h2>Heading</h2> MIXED; $str = preg_replace('/^(?!\<h[0-9]\>)(.*)$/m',"<p>$1</p>",$str); echo $str;
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus pulvinar lorem lectus, vel aliquam est blandit accumsan. Maecenas nisi eros, ornare a euismod rutrum, rhoncus a massa.</p> <p>Hello world</p> <p><b>Goodbye world</b></p> <h1>Heading</h1> <h2>Heading</h2>

preferences:
214.12 ms | 404 KiB | 284 Q