get_meta_keys

The timeline below displays how wordpress function get_meta_keys has changed across different WordPress versions. If a version is not listed, refer to the next available version below.

WordPress Version: 6.3

/**
 * Returns a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return string[] Array of meta key names.
 */
function get_meta_keys()
{
    global $wpdb;
    $keys = $wpdb->get_col("SELECT meta_key\n\t\tFROM {$wpdb->postmeta}\n\t\tGROUP BY meta_key\n\t\tORDER BY meta_key");
    return $keys;
}

WordPress Version: 5.9

/**
 * Returns a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return string[] Array of meta key names.
 */
function get_meta_keys()
{
    global $wpdb;
    $keys = $wpdb->get_col("\n\t\t\tSELECT meta_key\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tGROUP BY meta_key\n\t\t\tORDER BY meta_key");
    return $keys;
}

WordPress Version: 4.4

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return mixed
 */
function get_meta_keys()
{
    global $wpdb;
    $keys = $wpdb->get_col("\n\t\t\tSELECT meta_key\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tGROUP BY meta_key\n\t\t\tORDER BY meta_key");
    return $keys;
}

WordPress Version: 4.3

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb
 *
 * @return mixed
 */
function get_meta_keys()
{
    global $wpdb;
    $keys = $wpdb->get_col("\n\t\t\tSELECT meta_key\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tGROUP BY meta_key\n\t\t\tORDER BY meta_key");
    return $keys;
}

WordPress Version: 4.1

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @return mixed
 */
function get_meta_keys()
{
    global $wpdb;
    $keys = $wpdb->get_col("\n\t\t\tSELECT meta_key\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tGROUP BY meta_key\n\t\t\tORDER BY meta_key");
    return $keys;
}

WordPress Version: 3.7

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @return unknown
 */
function get_meta_keys()
{
    global $wpdb;
    $keys = $wpdb->get_col("\n\t\t\tSELECT meta_key\n\t\t\tFROM {$wpdb->postmeta}\n\t\t\tGROUP BY meta_key\n\t\t\tORDER BY meta_key");
    return $keys;
}