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run code in 200+ php & hhvm versions
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<?php $merged = [ '1' => '2', '2' => '3', '4' => '1', '5' => '2' ]; $aliasesReduced = false; while(!$aliasesReduced) { $aliasesReduced = true; foreach($merged as $originalId => &$mergedId) { if (array_key_exists($mergedId, $merged)) { $mergedId = $merged[$mergedId]; $aliasesReduced = false; } } } print_r($merged);
Output for 5.4.0 - 7.2.0
Array ( [1] => 3 [2] => 3 [4] => 3 [5] => 3 )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/hZAo9 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/hZAo9 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/hZAo9 on line 3
Process exited with code 255.