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run code in 150+ php & hhvm versions
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<?php function invChangeN($pattern, $inversion) { $junc = array_slice(['r', '3', '5', '7'], 0, count($pattern)); $pos = [ 'r' => [ 1, 7, 14], '3' => [-3, 5, 14], '5' => [ 3, 5, 10], '7' => [-1, 7, 10] ]; $inversion -= 2; $modScale = []; foreach ($pattern as $p => $f) { $p += ($pos[$f][0]*pow($inversion,2) + $pos[$f][1]*$inversion + $pos[$f][2])/2; $j = $junc[(array_search($f, $junc)+$inversion+2)%count($junc)]; $modScale[$p] = $j; } return $modScale; } var_dump(invChangeN([1=>"r",28=>"5",77=>"3"], 1));
Output for 5.4.0 - 7.1.0
array(3) { [5]=> string(1) "3" [32]=> string(1) "r" [80]=> string(1) "5" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/MqPtG on line 5
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 '[', expecting ')' in /in/MqPtG on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/MqPtG on line 5
Process exited with code 255.