实例介绍PHP中使用&符号引用传参,先上一个实例来看一下如何引用传递参数
<?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,
发表评论