3v4l.org

run code in 300+ PHP versions simultaneously
<?php $results = []; $results[] = ['topic' => 'Command Line']; $results[] = ['topic' => 'Symfony General']; $results[] = ['topic' => 'Dependency Injection']; $results[] = ['topic' => 'Validation']; $results[] = ['topic' => 'Cache']; $results[] = ['topic' => 'Form']; $results[] = ['topic' => 'Doctrine']; var_dump(iterator_to_array(new \RecursiveIteratorIterator(new \RecursiveArrayIterator($results)), true));
Output for 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 - 7.1.10, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { ["topic"]=> string(8) "Doctrine" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/PB7rc on line 2
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 '[' in /in/PB7rc on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/PB7rc on line 2
Process exited with code 255.

preferences:
230.34 ms | 401 KiB | 305 Q