Question

我正在使用此功能;

function forums_fid()
{
    if (!defined('FORUMS_FID'))
    {
        $maktaba_fid = '14';
        $ask_question_fid = '9';
    }
    define('FORUMS_FID', 1);
}

我想在另一个函数中使用变量值，所以为此我尝试使用此代码;

forums_fid();
$maktaba = '<a href="www.domain.com/forumdisplay.php?fid='.$maktaba_fid.'"><img src="./images/maktaba.png" alt="" title=""></a>';
$ask_question = '<a href="www.domain.com/newthread.php?fid='.$ask_question_fid.'"><img src="./images/ask-question.png" alt="" title=""></a>';

不幸的是，在第二段代码中，变量是空的。

请帮忙！

Answer 1

忘记我之前说过的话。你可以做的是定义两个空变量（NULL）并在函数中将它们声明为全局变量，用你想要的任何东西覆盖它们然后使用它们。顺便说一下，你必须在if-clausel中放置define（），否则PHP会抛出错误。

function forums_fid()
{
    global $maktaba_fid, $ask_question_fid;

    if (!defined('FORUMS_FID'))
    {
        define('FORUMS_FID', 1);
        $maktaba_fid = '14';
        $ask_question_fid = '9';
    }
}

$maktaba_fid = NULL;
$ask_question_fid = NULL;
forums_fid();
$maktaba = '<a href="www.domain.com/forumdisplay.php?fid='.$maktaba_fid.'"><img src="./images/maktaba.png" alt="" title=""></a>';
$ask_question = '<a href="www.domain.com/newthread.php?fid='.$ask_question_fid.'"><img src="./images/ask-question.png" alt="" title=""></a>';

这是一种方式。更好的方法是实际返回值（例如，作为数组）。

function forums_fid()
{
    if (!defined('FORUMS_FID'))
    {
        define('FORUMS_FID', 1);
        return array('maktaba_fid' => 14, 'ask_question_fid' => 9);
    }
}

$return = forums_fid();
$maktaba = '<a href="www.domain.com/forumdisplay.php?fid='.$return['maktaba_fid'].'"><img src="./images/maktaba.png" alt="" title=""></a>';
$ask_question = '<a href="www.domain.com/newthread.php?fid='.$return['ask_question_fid'].'"><img src="./images/ask-question.png" alt="" title=""></a>';

Answer 2

我会推荐 $GLOBALS 超级变量。

function forums_fid()
{
    if (!defined('FORUMS_FID'))
    {
        $GLOBALS['maktaba_fid'] = '14';
        $GLOBALS['ask_question_fid'] = '9';
    }
    define('FORUMS_FID', 1);
}

forums_fid();
echo $GLOBALS['maktaba_fid'].PHP_EOL;
echo $GLOBALS['ask_question_fid'];

的 DEMO：

http://3v4l.org/k7TVA

的文档：

http://php.net/manual/en/language.variables.scope.php

Answer 3

试试这个

function forums_fid()
{
    global $maktaba_fid;
    global $ask_question_fid;
    if (!defined('FORUMS_FID'))
    {
        $maktaba_fid = '14';
        $ask_question_fid = '9';
        define('FORUMS_FID', 1);
    }

}

从函数中获取Vars值

3 个答案: