問題描述

可能的重復(fù):
是否可以傳遞參數(shù)通過引用使用 call_user_func_array()?

我有以下代碼行在 PHP 5.1 中有效，但在 PHP 5.3 中無效.

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() 的參數(shù) 2 應(yīng)為參考，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

我將代碼更改為以下內(nèi)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 文檔中找到了這個:

I found this in the php documentation:

在使用 mysqli_stmt_bind_param() 時必須小心與 call_user_func_array() 結(jié)合使用.注意mysqli_stmt_bind_param() 需要通過引用傳遞參數(shù)，而 call_user_func_array() 可以接受一個列表作為參數(shù)可以表示引用或值的變量.

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.

所以我的問題是，如何復(fù)制 call_user_func_array + bind_params 的功能，以便我可以在運(yùn)行時動態(tài)綁定變量?

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?

推薦答案

我在 fabio at Kidopi dot com dot br3 年前在 mysqli_stmt::bind_param() 的 PHP 手冊頁(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):

在遷移到 php 5.3 后，我曾經(jīng)在使用 call_user_func_array 和 bind_param 時遇到問題.

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

原因是 5.3 需要數(shù)組值作為引用，而 5.2 使用真實(shí)值(但也使用引用).所以我創(chuàng)建了一個輔助函數(shù)來幫助我解決這個問題:

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; 
}

并將我以前的功能從:

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

到:

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

這樣我的 db 函數(shù)就可以在 PHP 5.2/5.3 服務(wù)器上繼續(xù)工作.

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

這篇關(guān)于php5.3 - mysqli_stmt:bind_params 帶有 call_user_func_array 警告的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！