get_metadata_by_mid( string $meta_type, int $meta_id )

Retrieves metadata by meta ID.


Parameters Parameters

$meta_type

(string) (Required) Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.

$meta_id

(int) (Required) ID for a specific meta row.


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Return Return

(stdClass|false) Metadata object, or boolean false if the metadata doesn't exist.

  • 'meta_key'
    (string) The meta key.
  • 'meta_value'
    (mixed) The unserialized meta value.
  • 'meta_id'
    (string) Optional. The meta ID when the meta type is any value except 'user'.
  • 'umeta_id'
    (string) Optional. The meta ID when the meta type is 'user'.
  • 'post_id'
    (string) Optional. The object ID when the meta type is 'post'.
  • 'comment_id'
    (string) Optional. The object ID when the meta type is 'comment'.
  • 'term_id'
    (string) Optional. The object ID when the meta type is 'term'.
  • 'user_id'
    (string) Optional. The object ID when the meta type is 'user'.


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Source Source

File: wp-includes/meta.php

function get_metadata_by_mid( $meta_type, $meta_id ) {
	global $wpdb;

	if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) {
		return false;
	}

	$meta_id = intval( $meta_id );
	if ( $meta_id <= 0 ) {
		return false;
	}

	$table = _get_meta_table( $meta_type );
	if ( ! $table ) {
		return false;
	}

	/**
	 * Short-circuits the return value when fetching a meta field by meta ID.
	 *
	 * The dynamic portion of the hook, `$meta_type`, refers to the meta object type
	 * (post, comment, term, user, or any other type with an associated meta table).
	 * Returning a non-null value will effectively short-circuit the function.
	 *
	 * @since 5.0.0
	 *
	 * @param stdClass|null $value   The value to return.
	 * @param int           $meta_id Meta ID.
	 */
	$check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id );
	if ( null !== $check ) {
		return $check;
	}

	$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';

	$meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) );

	if ( empty( $meta ) ) {
		return false;
	}

	if ( isset( $meta->meta_value ) ) {
		$meta->meta_value = maybe_unserialize( $meta->meta_value );
	}

	return $meta;
}


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Changelog Changelog

Changelog
Version Description
3.3.0 Introduced.

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