3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo strtolower(function () { return "Hello"; });
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: strtolower(): Argument #1 ($string) must be of type string, Closure given in /in/VcC8l:4 Stack trace: #0 /in/VcC8l(4): strtolower(Object(Closure)) #1 {main} thrown in /in/VcC8l on line 4
Process exited with code 255.
Output for 5.3.7 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: strtolower() expects parameter 1 to be string, object given in /in/VcC8l on line 4

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204.8 ms | 403 KiB | 254 Q