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filter is not described

sanitize_(object_type)_meta_(meta_key) filter-hook . WP 3.3.0

Filters the sanitization of a specific meta key of a specific meta type.

The dynamic portions of the hook name, $meta_type, and $meta_key, refer to the metadata object type (comment, post, term, or user) and the meta key value, respectively.


add_filter( 'sanitize_(object_type)_meta_(meta_key)', 'filter_function_name_1255', 10, 3 );
function filter_function_name_1255( $meta_value, $meta_key, $object_type ){
	// filter...

	return $meta_value;
Metadata value to sanitize.
Metadata key.
Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.


Since 3.3.0 Introduced.

Where the hook is called

wp-includes/meta.php 1111
return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type );

Where in WP core the hook is used

wp-includes/meta.php 1230
add_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'], 10, 4 );
wp-includes/meta.php 1232
add_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'], 10, 3 );
wp-includes/meta.php 1298
remove_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'] );
wp-includes/meta.php 1300
remove_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'] );