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<?php $array = []; // Create empty array var_dump($array); echo "-----\n"; $array = ['abc']; // Assign the value ['abc'] (array with one element 0 => 'abc' to $array) var_dump($array); echo "-----\n"; $array[] = 'abc'; // Add a new element to the array 'abc' var_dump($array); echo "-----\n"; $array += [0 => 'NEWabc', 4 => 'anotherABC']; // Concats two arrays, but the key [0] is already existing in the left-handside array so it ignores the first value from the right hand side array and only adds the second element (key 4 is not existing) var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(0) { } ----- array(1) { [0]=> string(3) "abc" } ----- array(2) { [0]=> string(3) "abc" [1]=> string(3) "abc" } ----- array(3) { [0]=> string(3) "abc" [1]=> string(3) "abc" [4]=> string(10) "anotherABC" }

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