未定义的偏移PHP错误 [英] undefined offset PHP error

问题描述

我在PHP中收到以下错误

I am receiving the following error in PHP

注意未定义的偏移量1:位于C:\ wamp \ www \ includes \ imdbgrabber.php第36行

Notice undefined offset 1: in C:\wamp\www\includes\imdbgrabber.php line 36

这是导致它的PHP代码:

Here is the PHP code that causes it:

<?php

# ...

function get_match($regex, $content)  
{  
    preg_match($regex,$content,$matches);     

    return $matches[1]; // ERROR HAPPENS HERE
}

错误是什么意思?

推荐答案

如果 preg_match 未找到匹配，$matches是一个空数组.因此，在访问$matches[0]之前，您应该检查preg_match是否找到匹配项，例如:

If preg_match did not find a match, $matches is an empty array. So you should check if preg_match found an match before accessing $matches[0], for example:

function get_match($regex,$content)
{
    if (preg_match($regex,$content,$matches)) {
        return $matches[0];
    } else {
        return null;
    }
}

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