3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(strlen(null)); var_dump(strlen(0)); var_dump(strlen(1234)); var_dump(strlen("")); var_dump(strlen("0")); var_dump(strlen(true));
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /in/gHQp2 on line 3 int(0) int(1) int(4) int(0) int(1) int(1)
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, 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 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
int(0) int(1) int(4) int(0) int(1) int(1)

preferences:
254.07 ms | 404 KiB | 337 Q