get_meta_keys() – Get a list of previously defined keys.
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Description
Returns a list of previously defined keys.
Usage
$string[] = get_meta_keys();
Parameters
Returns
string[] Array of meta key names.
Source
File name: wordpress/wp-admin/includes/post.php
Lines:
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function get_meta_keys() { global $wpdb; $keys = $wpdb->get_col( " SELECT meta_key FROM $wpdb->postmeta GROUP BY meta_key ORDER BY meta_key" ); return $keys; }