3v4l.org

run code in 300+ PHP versions simultaneously
<?php function the_title() { echo "Gas & Oil"; } function get_the_title() { return "Gas & Oil"; } ?> <a href="mailto:a@mail.com?subject=<?=urlencode(the_title()); ?>">Apply</a><br> <!-- doesn't work --> <a href="mailto:a@mail.com?subject=<?=urlencode(get_the_title()); ?>">Apply</a> <!-- works -->
Output for 8.1.0 - 8.1.7
<a href="mailto:a@mail.com?subject=Gas & Oil Deprecated: urlencode(): Passing null to parameter #1 ($string) of type string is deprecated in /in/kFu1v on line 9 ">Apply</a><br> <!-- doesn't work --> <a href="mailto:a@mail.com?subject=Gas+%26+Oil">Apply</a> <!-- works -->
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 - 7.4.30, 8.0.0 - 8.0.20
<a href="mailto:a@mail.com?subject=Gas & Oil">Apply</a><br> <!-- doesn't work --> <a href="mailto:a@mail.com?subject=Gas+%26+Oil">Apply</a> <!-- works -->

preferences:
29.22 ms | 412 KiB | 5 Q