3v4l.org

run code in 300+ PHP versions simultaneously
<?php set_error_handler(function() { debug_backtrace(); }); function x($s) { $s['a'] = 1; }; $y = '1'; x($y); print_r($y);
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: Cannot access offset of type string on string in /in/Z9ldV:5 Stack trace: #0 /in/Z9ldV(7): x('1') #1 {main} thrown in /in/Z9ldV on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.15 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
1
Output for 5.4.0 - 5.4.14
1
Process exited with code 139.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/Z9ldV on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/Z9ldV on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/Z9ldV on line 3
Process exited with code 255.

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