PHP ʖ²ἯTH º󍋼/A Ղ 15. ҽӃµĽ⊍ ҽӃ´«µݼ/H1 function foo ($var) {$var++;} $a=5; foo ($a); // $a is 6 here ±䁿£¬=ȧ foo($a) New ӯ¾䣬=ȧ foo(new foobar()) function bar() {$a = 5; return $a;} foo(bar()); function bar() // Note the missing {$a = 5; return $a;} foo(bar()); foo($a = 5) // Expression, not variable foo(5) // Constant, not variable º󍋼/A ưµ㼯A ҽӃ²»ʇʲô ɏһ¼¶ ҽӃ·µ»ؼ/TD