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run code in 200+ php & hhvm versions
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<?php $merged = [ 'a' => 'b', 'b' => 'c', 'c' => 'z', 'd' => 'a', 'e' => 'z' ]; $aliasesReduced = false; while(!$aliasesReduced) { $aliasesReduced = true; foreach($merged as $originalId => &$mergedId) { if (array_key_exists($mergedId, $merged)) { $mergedId = $merged[$mergedId]; $aliasesReduced = false; } } } print_r($aliases);
based on COIMR
Output for 5.4.0 - 7.2.0
Notice: Undefined variable: aliases in /in/6gll2 on line 25
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6gll2 on line 4
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/6gll2 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/6gll2 on line 4
Process exited with code 255.