Warning: array_key_exists() expects parameter 2 to be array, boolean given. Wordpress

Question

I'm new in php and having problem with a piece of my code if the key given exist. The code of error are below and i don't have a idea what is causing it. Please help.

"Warning: array_key_exists() expects parameter 2 to be array, boolean given in"

The line

if ( is_array(array_key_exists('sizes',wp_get_attachment_metadata($attach_id)) == false ){}

wp_get_attachment_metadata($attach_id) is returning a boolean instead of an array. Usually meaning the metadata for those attachments weren't found. — Darren
– Darren, Commented Jan 28, 2016 at 0:43
Not answering your question but: is_array(array_key_exists(... does not make much sense. array_key_exists returns an bool, and is_array expects an array ... — ArSeN
– ArSeN, Commented Jan 28, 2016 at 1:02

VolkerK · Accepted Answer · 2016-01-28 01:20:47Z

1

As ArSeN already pointed out, is_array(array_key_exists( doesn't make much sense. I guess you were trying: a) is not array or b) lacks a specific key.
Using a temporary variable you can do something like

if ( !is_array($meta=wp_get_attachment_metadata($attach_id)) || !array_key_exists('sizes', $meta) ) {
    // ....
}

Or, in case you try to access the meta data more often (or simply as a coding style):

$meta=wp_get_attachment_metadata($attach_id);
if ( !is_array($meta) || !array_key_exists('sizes', $meta) ) {
    // ....
}

answered Jan 28, 2016 at 1:20

VolkerK

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2 Comments

Ibu Over a year ago

Simply making the code cleaner makes it much easier to debug.+1

VolkerK Over a year ago

btw: the if condition could be reduced to if ( !isset($meta['sizes']) ) ... since php doesn't complain (not a warning, not a notice) when $meta is false. Not my style, but possible....

Ohgodwhy · Accepted Answer · 2016-01-28 00:45:20Z

0

You could drop a ternary into that thing to uglify the hell out of it.

if ( is_array(array_key_exists('sizes',wp_get_attachment_metadata($attach_id)) == false) ?: array() ){}

This way if the attachment metadata does not exist, it will provide an empty array, which in turn will produce a false from array_key_exists, which is similar to the behave of the desired code.

answered Jan 28, 2016 at 0:45

Ohgodwhy

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