PHP等於和運營商

Question

可能重複：
Reference - What does this symbol mean in PHP?
what do 「=&」/「&=」 operators in php mean?

對不起傢伙，我覺得我問一個過於簡單的問題，但什麼是=在PHP &？我試圖用CakePHP中的ACL使用此組功能...

Answer 1

當您想通過引用分配變量時，使用=&。欲瞭解更多信息，請參閱http://php.net/manual/en/language.references.php。

例子：

$a = array(1, 2, 3); 
// $b is a reference to $a. 
// If you change $a or $b, the value for both $a and $b will be changed. 
$b =& $a; 

$c = array(1, 2, 3); 
// $d is a copy of $c. 
// If you change $d, $c remains unchanged. 
$d = $c; 

Answer 2

$b = 3; 
$a =& $b; 
$b = 5; //$a is 5 now 
$a = 7; //$b is 7 now