metadata_exists( string $meta_type, int $object_id, string $meta_key )
Determine if a meta key is set for a given object
Description Description
Parameters Parameters
- $meta_type
-
(string) (Required) Type of object metadata is for (e.g., comment, post, term, or user).
- $object_id
-
(int) (Required) ID of the object metadata is for
- $meta_key
-
(string) (Required) Metadata key.
Return Return
(bool) True of the key is set, false if not.
Source Source
File: wp-includes/meta.php
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 | function metadata_exists( $meta_type , $object_id , $meta_key ) { if ( ! $meta_type || ! is_numeric ( $object_id ) ) { return false; } $object_id = absint( $object_id ); if ( ! $object_id ) { return false; } /** This filter is documented in wp-includes/meta.php */ $check = apply_filters( "get_{$meta_type}_metadata" , null, $object_id , $meta_key , true ); if ( null !== $check ) { return (bool) $check ; } $meta_cache = wp_cache_get( $object_id , $meta_type . '_meta' ); if ( ! $meta_cache ) { $meta_cache = update_meta_cache( $meta_type , array ( $object_id ) ); $meta_cache = $meta_cache [ $object_id ]; } if ( isset( $meta_cache [ $meta_key ] ) ) { return true; } return false; } |
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Changelog Changelog
Version | Description |
---|---|
3.3.0 | Introduced. |
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// Check and get a term meta
if
( metadata_exists(
'term'
,
$term_id
,
'_meta_key'
) ) {
$meta_value
= get_term_meta(
$term_id
,
'_meta_key'
, true );
}
// Check and get a post meta
if
( metadata_exists(
'post'
,
$post_id
,
'_meta_key'
) ) {
$meta_value
= get_post_meta(
$post_id
,
'_meta_key'
, true );
}
// Check and get a user meta
if
( metadata_exists(
'user'
,
$user_id
,
'_meta_key'
) ) {
$meta_value
= get_user_meta(
$user_id
,
'_meta_key'
, true );
}
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