PHP引用的理解
在PHP中,函数的参数传递默认是值传递,我们可以改成引用传递,只要在定义函数时,在参数前面加一个&就可以,如
$a = "测试"; function setName(& $name){ $name = "测试OK"; } setName($a); echo $a; //输出 测试OK
?以上只是最普通的参数引用传递,还有一种就是返回值为一个引用,看以下例子
class Test{ public $a = array(1,2,3,4); function &getA() { return $this->a; } } $a = new Test(); $b = &$a->getA(); $b[0] = 101; print_r($a->getA());?
输出内容是: Array ( [0] => 101 [1] => 2 [2] => 3 [3] => 4 )

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mPDF
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