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<?php $arr = array(5 => 1, 12 => 2); $arr[] = 56; // This is the same as $arr[13] = 56; // at this point of the script $arr["x"] = 42; // This adds a new element to // the array with key "x" var_dump($arr);
Output for 4.3.0 - 7.1.0
array(4) { [5]=> int(1) [12]=> int(2) [13]=> int(56) ["x"]=> int(42) }