Warning: Illegal string offset in PHP 5.4 [duplicate]

问题:

This question already has an answer here:

• Illegal string offset Warning PHP 11 answers

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 

Those lines are this part of the code:

for($i = 0; $i 

So the $tmp_url and $tmp_title line.

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

Update:

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

$meta = get_post_meta($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?

回答1:

You need to make sure, that $meta is actually of type array. The warning explicitly tells you, that $meta seems to be a stringarray

Illegal string offset         ^^^^^^ 

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

for($i = 0; $i 

回答2:

If $meta is null whenever there's no data to process:

if( !is_null($meta) ){     for($i = 0; $i 

You should be able to do more checks if necessary. That depends on what that get_post_meta() function is designed to return.

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