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<?php $set1 = ['A', 'B', 'C']; $set2 = [1, 2, 3]; function perms( $set1, $set2, $i) { $perms = array(); if( $i == count( $set1) - 1) { return array(); } foreach( $set1 as $n1) { foreach( $set2 as $n2) { $perms[] = $n1 . $n2; } } $i++; for( $j = 0; $j < $i; $j++) { $set1[] = array_shift( $set1); $set2[] = array_shift( $set2); } return array_merge( $perms, perms( $set1, $set2, $i)); } var_dump( perms( $set1, $set2, 0));
Output for git.master, git.master_jit, rfc.property-hooks
array(18) { [0]=> string(2) "A1" [1]=> string(2) "A2" [2]=> string(2) "A3" [3]=> string(2) "B1" [4]=> string(2) "B2" [5]=> string(2) "B3" [6]=> string(2) "C1" [7]=> string(2) "C2" [8]=> string(2) "C3" [9]=> string(2) "B2" [10]=> string(2) "B3" [11]=> string(2) "B1" [12]=> string(2) "C2" [13]=> string(2) "C3" [14]=> string(2) "C1" [15]=> string(2) "A2" [16]=> string(2) "A3" [17]=> string(2) "A1" }

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