3v4l.org

run code in 300+ PHP versions simultaneously
<?php function formatLink($post) { if(preg_match('/^\>\>[0-9]{+}$/', $post)) { return "<font color=\"red\">".htmlentities($post)."</font>"; } else { return "<font color=\"#b7b7b7\">".htmlentities($post)."</font>"; } } echo formatLink(">>86721678");
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.24, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6
<font color="#b7b7b7">&gt;&gt;86721678</font>
preferences:
92.25 ms | 409 KiB | 5 Q