警告:PHP 5.4中的字符串偏移量非法 [英] Warning: Illegal string offset in PHP 5.4

问题描述

我今天升级到PHP 5.4，并且收到一些奇怪的警告:

I upgraded to PHP 5.4 today and I am receiving some strange warnings:

Warning: Illegal string offset 'quote1' in file.php on line 110
Warning: Illegal string offset 'quote1_title' in file.php on line 111

这些行是代码的一部分:

Those lines are this part of the code:

for($i = 0; $i < 3; $i++) {
    $tmp_url = $meta['quote'. ($i+1)];
    $tmp_title = $meta['quote' . ($i+1) .'_title'];

    if(!empty($tmp_url) || !empty($tmp_title)) {
        $quotes[$src_cnt] = array();
        $quotes[$src_cnt]['url'] = $tmp_url;
        $quotes[$src_cnt]['title'] = $tmp_title;
        $src_cnt++;
    }
}

所以$tmp_url和$tmp_title行.

为什么我会收到这个奇怪的警告，如何解决?

Why am I receiving this odd warning and what is the solution?

更新:

此代码被用作Wordpress插件. $ meta包括:

This code is being used as a Wordpress plugin. $meta includes:

$meta = get_post_meta($post->ID,'_quote_source',TRUE);

因此，我怀疑只要引号字段为空，就会出现此警告.当字段为空时，有什么办法可以解决此问题?

So I am suspecting that whenever the quotes fields are empty, this warning appears. Is there any way that I can fix this for when the fields are empty?

推荐答案

您需要确保$meta实际上是数组类型.该警告明确告诉您，$meta似乎是string而不是array

You need to make sure, that $meta is actually of type array. The warning explicitly tells you, that $meta seems to be a string and not an array

Illegal string offset
        ^^^^^^

为避免此错误，您还可以检查必填字段

To avoid this error you may also check for the needed fields

for($i = 0; $i < 3; $i++) {
    if ( !is_array($meta) || !array_key_exists('quote'. ($i+1), $meta) ){
         continue;
    }
    // your code
}

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