3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($i=0;$i<20;$i++) $a['a'.$i] = array('a','b','c','d','e','f'); for ($i=0; $i<10000; $i++) { $merged = call_user_func_array('array_merge', $a); }
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 ArgumentCountError: array_merge() does not accept unknown named parameters in /in/MjjmM:6 Stack trace: #0 /in/MjjmM(6): array_merge(a0: Array, a1: Array, a2: Array, a3: Array, a4: Array, a5: Array, a6: Array, a7: Array, a8: Array, a9: Array, a10: Array, a11: Array, a12: Array, a13: Array, a14: Array, a15: Array, a16: Array, a17: Array, a18: Array, a19: Array) #1 {main} thrown in /in/MjjmM on line 6
Process exited with code 255.
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, 5.6.8 - 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
preferences:
204.21 ms | 404 KiB | 340 Q