Online PHP editor | perf for 5BF1c

<?php $values1 = [1, 2, 3, 4, 5]; $values2 = [3, 4, 6, 7]; // You can construct the set iteratively $set1 = []; foreach ([1, 2, 3, 4, 5] as $val) { $set1[$val] = true; } assert(array_keys($set1) == [1, 2, 3, 4, 5]); // Or all at once $set2 = array_fill_keys($values2, true); assert(array_keys($set2) == [3, 4, 6, 7]); // Set operations $union = $set1 + $set2; assert(array_keys($union) == [1, 2, 3, 4, 5, 6, 7]); $intersection = array_intersect_key($set1, $set2); assert(array_keys($intersection) == [3, 4]); // This one's still quite ugly $exclusion = array_diff_key($set1, $set2) + array_diff_key($set2, $set1); assert(array_keys($exclusion) == [1, 2, 5, 6, 7]); $difference = array_diff_key($set1, $set2); assert(array_keys($difference) == [1, 2, 5]);

Version	System time (s)	User time (s)	Memory (MiB)
8.5.2	0.010	0.009	17.49
8.5.1	0.013	0.005	16.87
8.4.17	0.013	0.009	20.61
8.4.16	0.012	0.009	22.20
8.4.9	0.011	0.009	17.92
8.3.30	0.017	0.007	18.42
8.3.29	0.015	0.007	18.50
8.3.18	0.011	0.008	16.66
8.3.5	0.008	0.012	16.78
7.0.0	0.029	0.008	17.17