WP_Meta_Query::is_first_order_clause()
Method: Determines whether a query clause is first-order.
Source: wp-includes/class-wp-meta-query.php:260
WP_Meta_Query::parse_query_vars()
Method: Constructs a meta query based on ‘meta_*’ query vars
Source: wp-includes/class-wp-meta-query.php:271
get_object_subtype()
Function: Returns the object subtype for a given object ID of a specific type.
Source: wp-includes/meta.php:1743
get_object_subtype_{$object_type}
Filter Hook: Filters the object subtype identifier for a non-standard object type.
Source: wp-includes/meta.php:1802
sanitize_meta()
Function: Sanitizes meta value.
Source: wp-includes/meta.php:1313
sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}
Filter Hook: Filters the sanitization of a specific meta key of a specific meta type and subtype.
Source: wp-includes/meta.php:1331
sanitize_{$object_type}_meta_{$meta_key}
Filter Hook: Filters the sanitization of a specific meta key of a specific meta type.
Source: wp-includes/meta.php:1348
register_meta()
Function: Registers a meta key.
Source: wp-includes/meta.php:1399
register_meta_args
Filter Hook: Filters the registration arguments when registering meta.
Source: wp-includes/meta.php:1447
registered_meta_key_exists()
Function: Checks if a meta key is registered.
Source: wp-includes/meta.php:1590