3v4l.org

run code in 300+ PHP versions simultaneously
<?php chdir('/tmp'); var_dump(realpath(null), realpath(false), realpath(''));
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: realpath(): Passing null to parameter #1 ($path) of type string is deprecated in /in/rNU40 on line 4 string(4) "/tmp" string(4) "/tmp" string(4) "/tmp"
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 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 - 7.4.33, 8.0.0 - 8.0.30
string(4) "/tmp" string(4) "/tmp" string(4) "/tmp"
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
bool(false) bool(false) bool(false)

preferences:
294.39 ms | 402 KiB | 460 Q