警告：PHP 5.4 中的非法字符串偏移
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/16264115/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Warning: Illegal string offset in PHP 5.4
提问by Henrik Petterson
I upgraded to PHP 5.4 today and I am receiving some strange warnings:
我今天升级到 PHP 5.4，但收到了一些奇怪的警告：
Warning: Illegal string offset 'quote1' in file.php on line 110
Warning: Illegal string offset 'quote1_title' in file.php on line 111
Those lines are this part of the code:
这些行是代码的这一部分：
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++;
}
}
So the $tmp_urland $tmp_titleline.
所以$tmp_url和$tmp_title线。
Why am I receiving this odd warning and what is the solution?
为什么我会收到这个奇怪的警告，解决方案是什么？
Update:
更新：
This code is being used as a Wordpress plugin. $meta includes:
此代码被用作 Wordpress 插件。$meta 包括：
$meta = get_post_meta($post->ID,'_quote_source',TRUE);
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?
所以我怀疑每当引号字段为空时，就会出现此警告。当字段为空时，有什么方法可以解决这个问题？
回答by MatthiasLaug
You need to make sure, that $metais actually of type array. The warning explicitly tells you, that $metaseems to be a string?and not an array
您需要确保它$meta实际上是数组类型。警告明确告诉您，这$meta似乎是string? 而不是array
Illegal string offset
^^^^^^
To avoid this error you may also check for the needed fields
为避免此错误，您还可以检查所需的字段
for($i = 0; $i < 3; $i++) {
if ( !is_array($meta) || !array_key_exists('quote'. ($i+1), $meta) ){
continue;
}
// your code
}
回答by álvaro González
If $metais nullwhenever there's no data to process:
如果$meta是null，每当有没有数据对过程：
if( !is_null($meta) ){
for($i = 0; $i < 3; $i++) {
// ...
}
}
You should be able to do more checks if necessary. That depends on what that get_post_meta()function is designed to return.
如有必要，您应该能够进行更多检查。这取决于该get_post_meta()函数旨在返回的内容。
