3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(); $a['foo'] = "Hello"; $a['foo']['bar'] = "World"; var_dump($a);
Output for 8.0.7 - 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/WDJfm:5 Stack trace: #0 {main} thrown in /in/WDJfm on line 5
Process exited with code 255.
Output for 8.0.0 - 8.0.6
Warning: Only the first byte will be assigned to the string offset in /in/WDJfm on line 5 Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /in/WDJfm:5 Stack trace: #0 {main} thrown in /in/WDJfm on line 5
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Illegal string offset 'bar' in /in/WDJfm on line 5 array(1) { ["foo"]=> string(5) "Wello" }

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231.18 ms | 403 KiB | 383 Q