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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_3737', 10, 3 );
function filter_function_name_3737( $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 1226
return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type );

Where in WP core the hook is used WordPress

wp-includes/meta.php 1352
add_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'], 10, 4 );
wp-includes/meta.php 1354
add_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'], 10, 3 );
wp-includes/meta.php 1496
remove_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'] );
wp-includes/meta.php 1498
remove_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'] );