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run code in 200+ php & hhvm versions
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<?php $meta = [ 'stationFrom' => 'Antwerpen', 'stationTo' => 'London', 'places' => [1, 3, 4], ]; $formattedMeta = [ 'stationFrom' => 'Antwerpen', 'stationTo' => 'London', 'places' => function($meta) { return implode(',', $meta['places']); } ]; var_dump($formattedMeta['places']($meta), $formattedMeta['places']); echo json_encode($formattedMeta);
Output for 5.4.0 - 7.2.0
string(5) "1,3,4" object(Closure)#1 (1) { ["parameter"]=> array(1) { ["$meta"]=> string(10) "<required>" } } {"stationFrom":"Antwerpen","stationTo":"London","places":{}}
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/j1aPi on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/j1aPi on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/j1aPi on line 3
Process exited with code 255.