3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo preg_replace(array('/\s{2,}/', '/\n/'), '', '<h1> A headline like it would be formatted by an IDE </h1>');
based on ffIM1
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
<h1>A headline like it would be formatted by an IDE</h1>