February 11, 2011 
Definition:
function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {}
Delete metadata for the specified object.
Parameters
- string $meta_type: Type of object metadata is for (e.g., comment, post, or user)
- int $object_id: ID of the object metadata is for
- string $meta_key: Metadata key
- string $meta_value: Optional. Metadata value. If specified, only delete metadata entries with this value. Otherwise, delete all entries with the specified meta_key.
- bool $delete_all: Optional, default is false. If true, delete matching metadata entries for all objects, ignoring the specified object_id. Otherwise, only delete matching metadata entries for the specified object_id.
Return values
returns:True on successful delete, false on failure.
Defined filters
- delete_{$meta_type}_metadata
apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all )
Source code
function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {
if ( !$meta_type || !$meta_key )
return false;
if ( (!$object_id = absint($object_id)) && !$delete_all )
return false;
if ( ! $table = _get_meta_table($meta_type) )
return false;
global $wpdb;
$type_column = esc_sql($meta_type . '_id');
$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
// expected_slashed ($meta_key)
$meta_key = stripslashes($meta_key);
$meta_value = stripslashes_deep($meta_value);
$check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all );
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