Online PHP editor | output for iXC4s

<?php var_export([ // haystack, then needle 'a:aa' => str_contains('a', 'aa'), // false ...cast to 0 'aa:a' => str_contains('aa', 'a'), // true ...cast to 1 'a:a' => str_contains('a', 'a'), // true ...cast to 1 'aa:aa' => str_contains('aa', 'aa'), // true ...cast to 1 ]); echo "\n---\n"; $params = [ ['one' => 'a', 'two' => 'aa', 'three' => 'a', 'four' => 'aa'], // haystacks ['three' => 'a', 'one' => 'aa', 'four' => 'aa', 'two' => 'a'], // needles 'str_contains' ]; var_export([ 'udiff' => array_udiff_assoc(...$params), 'uintersect' => array_uintersect_assoc(...$params), ]);