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run code in 150+ php & hhvm versions
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<?php function computeCombination(array $source,$picks,$startIndex=0,array $pad=array()) { if($picks<=0) { return array($pad); } elseif($picks>=count($source)-$startIndex) { return array(array_merge($pad,array_slice($source,$startIndex))); } $result=array(); foreach(range($startIndex,count($source)-$picks) as $subStartIndex) { $subPad=$pad; $subPad[]=$source[$subStartIndex]; if(empty($pad))// to make the output look nice { $result=array_merge($result,computeCombination($source,$picks-1,$subStartIndex+1,$subPad)); } else { $result=array_merge($result,array(computeCombination($source,$picks-1,$subStartIndex+1,$subPad))); } } return $result; } print_r(computeCombination(array(1,2,3,4,5),2));
Output for 5.1.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => Array ( [0] => 1 [1] => 2 ) ) [1] => Array ( [0] => Array ( [0] => 1 [1] => 3 ) ) [2] => Array ( [0] => Array ( [0] => 1 [1] => 4 ) ) [3] => Array ( [0] => Array ( [0] => 1 [1] => 5 ) ) [4] => Array ( [0] => Array ( [0] => 2 [1] => 3 ) ) [5] => Array ( [0] => Array ( [0] => 2 [1] => 4 ) ) [6] => Array ( [0] => Array ( [0] => 2 [1] => 5 ) ) [7] => Array ( [0] => Array ( [0] => 3 [1] => 4 ) ) [8] => Array ( [0] => Array ( [0] => 3 [1] => 5 ) ) [9] => Array ( [0] => 4 [1] => 5 ) )
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/2OjR5 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/2OjR5 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/2OjR5 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/2OjR5 on line 2
Process exited with code 255.