PHP中的“&”是什么意思？

考虑这个 PHP代码：

call_user_func(array(&$this,'method_name'),$args);

我知道这是指定义函数时的传递参考,但是在调用函数时是否正确？

从 Passing By Reference文档页面：

You can pass a variable by reference
to a function so the function can
modify the variable. The Syntax is as
follows:

<?PHP
function foo(&$var)
{
    $var++;
}

$a=5;
foo($a);
// $a is 6 here
?>

…In recent versions of PHP you will get a warning saying that “call-time pass-by-reference” is deprecated when you use & in foo(&$a);

原文地址：https://www.jb51.cc/php/139376.html