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<?php $a = range(1,25); $b = array('21'=>'test'); $t = array_map('associate', $a); function associate($av) { $r = (isset($b[$av]))?$b[$av]:null; } print_r($t);
Output for 4.3.0 - 7.1.0
Array ( [0] => [1] => [2] => [3] => [4] => [5] => [6] => [7] => [8] => [9] => [10] => [11] => [12] => [13] => [14] => [15] => [16] => [17] => [18] => [19] => [20] => [21] => [22] => [23] => [24] => )