PHP通过引用传递参数

<?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,

巴特西

PHP通过引用传递参数

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