update_postmeta – Hook | Developer.WordPress.org

do_action( ‘update_postmeta’, int $meta_id, int $object_id, string $meta_key, mixed $meta_value )

Fires immediately before updating a post’s metadata.

Parameters

$meta_idint: ID of metadata entry to update.
$object_idint: Post ID.
$meta_keystring: Metadata key.
$meta_valuemixed: Metadata value. This will be a PHP-serialized string representation of the value if the value is an array, an object, or itself a PHP-serialized string.

do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );

Used by	Description
update_metadata_by_mid()`wp-includes/meta.php`	Updates metadata by meta ID.
update_metadata()`wp-includes/meta.php`	Updates metadata for the specified object. If no value already exists for the specified object ID and metadata key, the metadata will be added.

Version	Description
2.9.0	Introduced.

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