PHP ʖ²ἯTH º󍋼/A $a = ($b = 4) + 5; // $a is equal to 9 now, and $b has been set to 4. $a = 3; $a += 5; // sets $a to 8, as if we had said: $a = $a + 5; $b = "Hello "; $b .= "There!"; // sets $b to "Hello There!", just like $b = $b. "There!"; º󍋼/A ưµ㼯A ɏһ¼¶