php按引用传参

传递方式

调用函数func($str)

定义函数function func(&$str)

注意使用方式！

使用错误会提示：Call-time pass-by-reference has been removed....

看一段别人的例子：

<?php

functionadd_some_extra(&$string) // 引入变量，使用同一个存储地址

{

$string .='and something extra.';

}

$str ='This is a string, ';

add_some_extra($str);

echo $str; // outputs 'This is a string, and something extra.'

}

?>

输出结果：This is a string,and something extra.

<?phpfunctionadd_some_extra($string){

$string .= 'and something extra.';

}

$str = 'This is a string, ';

add_some_extra($str);

echo $str; // outputs 'This is a string, '?>

输出结果：This is a string,