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<?php function P(array $sources) { $result=array(); $cache=array(); foreach($sources as $node) { $cache=$result; $result=array(); foreach($node as $item) { if(empty($cache)) { $result[]=array($item); } else { foreach($cache as $line) { $line[]=$item; $result[]=$line; } } } } return $result; } $result=P(array( array('a', 'b'), array('c', 'd'))); print_r(array_map(function($a){return implode(",",$a);},$result));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => a,c [1] => b,c [2] => a,d [3] => b,d )

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