Online PHP editor | output for X97m4

<?php $tag_merge_count = 50000; $a = []; $b = ['foo', 'bar', 'baz']; $c = ['llamas', 'are', 'awesome']; $iterations = $tag_merge_count/4; for ($i = 0; $i < $iterations; $i++) { array_unique(array_merge($a, $b)); // empty + non-empty array_unique(array_merge($b, $a)); // non-empty + empty array_unique(array_merge($b, $b)); // non-empty + non-empty, with 100% collision array_unique(array_merge($b, $c)); // non-empty + non-empty, with 0% collision }