3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = [ 'en' => '', 'fr' => 'fr' ]; $bar = [ 'de' => 'de' ]; $bar[] = $foo['en']; var_dump(array_count_values($foo)); $bar[] = &$foo['fr']; var_dump(array_count_values($foo));
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 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
array(2) { [""]=> int(1) ["fr"]=> int(1) } array(2) { [""]=> int(1) ["fr"]=> int(1) }
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/mV25H 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/mV25H on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/mV25H on line 2
Process exited with code 255.
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228.35 ms | 401 KiB | 341 Q