3v4l.org

run code in 200+ php & hhvm versions
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<?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 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.12
<font color="#b7b7b7">&gt;&gt;86721678</font>