3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a=''; var_dump('' == $a and 'a' == $a and '' === (string)$a and 'a' === (string)$a);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(false)

preferences:
231.37 ms | 404 KiB | 336 Q