3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(false => 1); var_dump(array_key_exists(false, $a));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
bool(true)
Output for 4.3.2 - 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, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_key_exists(): The first argument should be either a string or an integer in /in/R2sok on line 4 bool(false)
Output for 4.3.0 - 4.3.1
Warning: array_key_exists() [http://www.php.net/function.array-key-exists]: The first argument should be either a string or an integer in /in/R2sok on line 4 bool(false)

preferences:
227.33 ms | 401 KiB | 315 Q