本文实例讲述了PHP通过引用传递参数用法。分享给大家供大家参考,具体如下:
先看一个手册上的示例:
<?php function add_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 $str; // outputs 'This is a string, and something extra.' ?>
输出:
This is a string, and something extra.
如果没有这个&符号,
<?php function add_some_extra($string) { $string .= 'and something extra.'; } $str = 'This is a string, '; add_some_extra($str); echo $str; // outputs 'This is a string, ' ?>
输出:
This is a string,
希望本文所述对大家PHP程序设计有所帮助。