问题描述

可能的重复:
是否可以传递参数通过引用使用 call_user_func_array()?

我有以下代码行在 PHP 5.1 中有效，但在 PHP 5.3 中无效.

I have the following line of code which worked in PHP 5.1, but isn't working in PHP 5.3.

$input = array('ss','john','programmer');
call_user_func_array(array($mysqli_stmt, 'bind_param'), $input);

在 PHP 5.3 中，我收到以下警告消息:

In PHP 5.3, I get the following warning message:

警告:mysqli_stmt::bind_param() 的参数 2 应为参考，值在/var/www/startmission/em/class/cls.data_access_object.php 第 785 行

Warning: Parameter 2 to mysqli_stmt::bind_param() expected to be a reference, value given in /var/www/startmission/em/class/cls.data_access_object.php on line 785

我将代码更改为以下内容并且它起作用了:

I changed the code to the following and it worked:

$a = 'johnl';
$b = 'programmer';
$mysqli_stmt->bind_param('ss',$a,$b);

我在 php 文档中找到了这个:

I found this in the php documentation:

在使用 mysqli_stmt_bind_param() 时必须小心与 call_user_func_array() 结合使用.注意mysqli_stmt_bind_param() 需要通过引用传递参数，而 call_user_func_array() 可以接受一个列表作为参数可以表示引用或值的变量.

Care must be taken when using mysqli_stmt_bind_param() in conjunction with call_user_func_array(). Note that mysqli_stmt_bind_param() requires parameters to be passed by reference, whereas call_user_func_array() can accept as a parameter a list of variables that can represent references or values.

所以我的问题是，如何复制 call_user_func_array + bind_params 的功能，以便我可以在运行时动态绑定变量?

So my question is, how do I replicate the functionality of the call_user_func_array + bind_params such that i can dynamically bind variables at run time?

推荐答案

我在 fabio at Kidopi dot com dot br3 年前在 mysqli_stmt::bind_param() 的 PHP 手册页(略有修改):

I found the answer to my problem in a user note by fabio at kidopi dot com dot br3 years ago on the PHP manual page of mysqli_stmt::bind_param() (slightly modified):

在迁移到 php 5.3 后，我曾经在使用 call_user_func_array 和 bind_param 时遇到问题.

I used to have problems with call_user_func_array and bind_param after migrating to php 5.3.

原因是 5.3 需要数组值作为引用，而 5.2 使用真实值(但也使用引用).所以我创建了一个辅助函数来帮助我解决这个问题:

The cause is that 5.3 requires array values as reference while 5.2 worked with real values (but also with references). So I created a secondary helper function to help me with this:

function refValues($arr)
{ 
        $refs = array();

        foreach ($arr as $key => $value)
        {
            $refs[$key] = &$arr[$key]; 
        }

        return $refs; 
}

并将我以前的功能从:

call_user_func_array(array($this->stmt, "bind_param"), $this->values); 

到:

call_user_func_array(array($this->stmt, "bind_param"), refValues($this->values)); 

这样我的 db 函数就可以在 PHP 5.2/5.3 服务器上继续工作.

This way my db functions keep working in PHP 5.2/5.3 servers.

这篇关于php5.3 - mysqli_stmt:bind_params 带有 call_user_func_array 警告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！