WP_Tax_Query::sanitize_relation() WordPress Method
The WP_Tax_Query::sanitize_relation() method is used to set the correct operator for the given relation. This is used internally by the class when creating SQL queries.
WP_Tax_Query::sanitize_relation( string $relation ) #
Sanitize a ‘relation’ operator.
Parameters
- $relation
- (string)(Required)Raw relation key from the query argument. 
Return
(string) Sanitized relation ('AND' or 'OR').
Source
File: wp-includes/class-wp-tax-query.php
	public function sanitize_relation( $relation ) {
		if ( 'OR' === strtoupper( $relation ) ) {
			return 'OR';
		} else {
			return 'AND';
		}
	}
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Changelog
| Version | Description | 
|---|---|
| 4.1.0 | Introduced. |