Error with meta_type_date() function

When adding custom date meta, there seems to be a bug. If you use a custom range of dates, the $interval variable in the function meta_type_date in wp-meta.php looks like this:

array('name'=>'', 'min'=>'valid date', 'max'=>'valid date');

However, the function goes on to use array_shift to get the $min and $max values. So name ends up in $min and min ends up in $max. When not using a pre-defined range, this results in an error (Start date must be anterior to end date) and if you did define a range, it’ll try to format the string name of the range as a date, which won’t error, but also won’t output what you asked for.

Proposed resolution:

Replace line 326 in wp-meta.php.

Currently: $min = new \Carbon\Carbon( array_shift( $interval ) );
Proposed: $min = new \Carbon\Carbon( $interval['min'] );

And replace line 335 similarly. I’d be happy to contribute that myself if need be.

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