Order by custom field attribute

You have to add:

'meta_key' => 'key_name'

to the arguments array in order to use the key with the orderby parameter. Additionally you have to have the orderby parameter like this:

'orderby' => 'meta_value'

But if you have the data you want to sort by saved into an array, like your code suggests, you have a problem. You won’t be able to use it for sorting, take a look at the answer to this question WP_Query meta_query by array key for an explanation.

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