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run code in 150+ php & hhvm versions
Bugs & Features
<?php $input = [ [1,3], [1,6], [7,8] ]; $available = [6=>0, 1=>1]; //product $result = array_reduce(array_slice($input, 1), function($c, $x) { return call_user_func_array('array_merge', array_map(function($y) use ($c) { return array_map(function($z) use ($y) { return array_merge((array)$z, (array)$y); }, $c); }, $x) ); }, current($input)); var_dump($result); //filter: $result = array_filter($result, function($tuple) use ($available) { foreach(array_count_values($tuple) as $value=>$count) { if(isset($available[$value]) && $available[$value]<$count) { return false; } } return true; }); var_dump($result);
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(8) { [0]=> array(3) { [0]=> int(1) [1]=> int(1) [2]=> int(7) } [1]=> array(3) { [0]=> int(3) [1]=> int(1) [2]=> int(7) } [2]=> array(3) { [0]=> int(1) [1]=> int(6) [2]=> int(7) } [3]=> array(3) { [0]=> int(3) [1]=> int(6) [2]=> int(7) } [4]=> array(3) { [0]=> int(1) [1]=> int(1) [2]=> int(8) } [5]=> array(3) { [0]=> int(3) [1]=> int(1) [2]=> int(8) } [6]=> array(3) { [0]=> int(1) [1]=> int(6) [2]=> int(8) } [7]=> array(3) { [0]=> int(3) [1]=> int(6) [2]=> int(8) } } array(2) { [1]=> array(3) { [0]=> int(3) [1]=> int(1) [2]=> int(7) } [5]=> array(3) { [0]=> int(3) [1]=> int(1) [2]=> int(8) } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/vjY1T 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/vjY1T on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/vjY1T on line 3
Process exited with code 255.