3v4l.org

run code in 300+ PHP versions simultaneously
<?php $title = "Gas&Oil"; ?> <a href="mailto:a@mail.com?subject=<?= ($title); ?>">Apply</a>
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 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 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
<a href="mailto:a@mail.com?subject=Gas&Oil">Apply</a>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
<a href="mailto:a@mail.com?subject=<?= ($title); ?>">Apply</a>

preferences:
73.64 ms | 411 KiB | 5 Q