3v4l.org

run code in 300+ PHP versions simultaneously
<?php function reverseString($string) { $l = strlen($string); for($i=0; $i<$l/2; $i++) { $string[$i] = $string[$i] ^ $string[$l-$i]; $string[$l-$i] = $string[$i] ^ $string[$l-$i]; $string[$i] = $string[$i] ^ $string[$l-$i]; } return $string; } var_dump(reverseString('foo'));
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
Warning: Uninitialized string offset 3 in /in/NJZOj on line 7 Fatal error: Uncaught Error: Cannot assign an empty string to a string offset in /in/NJZOj:7 Stack trace: #0 /in/NJZOj(14): reverseString('foo') #1 {main} thrown in /in/NJZOj on line 7
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Uninitialized string offset: 3 in /in/NJZOj on line 7 Warning: Cannot assign an empty string to a string offset in /in/NJZOj on line 7 Notice: Uninitialized string offset: 3 in /in/NJZOj on line 8 Warning: Cannot assign an empty string to a string offset in /in/NJZOj on line 8 Notice: Uninitialized string offset: 3 in /in/NJZOj on line 9 Warning: Cannot assign an empty string to a string offset in /in/NJZOj on line 9 string(3) "foo"
Output for 7.3.32 - 7.3.33
Warning: Cannot assign an empty string to a string offset in /in/NJZOj on line 7 Warning: Cannot assign an empty string to a string offset in /in/NJZOj on line 8 Warning: Cannot assign an empty string to a string offset in /in/NJZOj on line 9 string(3) "foo"
Output for 5.2.12 - 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
Notice: Uninitialized string offset: 3 in /in/NJZOj on line 7 Notice: Uninitialized string offset: 3 in /in/NJZOj on line 8 string(4) "oo"
Output for 5.2.10 - 5.2.11
Notice: Uninitialized string offset: 3 in /in/NJZOj on line 7 Notice: Uninitialized string offset: 3 in /in/NJZOj on line 8 Notice: Uninitialized string offset: 3 in /in/NJZOj on line 8 string(4) "oo"
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 - 5.2.9
Notice: Uninitialized string offset: 3 in /in/NJZOj on line 7 Notice: Uninitialized string offset: 3 in /in/NJZOj on line 8 string(4) "oo"
preferences:
252.79 ms | 402 KiB | 313 Q