WP_Date_Query::sanitize_query( array $queries, array $parent_query = null ): array

Source

public function sanitize_query( $queries, $parent_query = null ) {
	$cleaned_query = array();

	$defaults = array(
		'column'   => 'post_date',
		'compare'  => '=',
		'relation' => 'AND',
	);

	// Numeric keys should always have array values.
	foreach ( $queries as $qkey => $qvalue ) {
		if ( is_numeric( $qkey ) && ! is_array( $qvalue ) ) {
			unset( $queries[ $qkey ] );
		}
	}

	// Each query should have a value for each default key. Inherit from the parent when possible.
	foreach ( $defaults as $dkey => $dvalue ) {
		if ( isset( $queries[ $dkey ] ) ) {
			continue;
		}

		if ( isset( $parent_query[ $dkey ] ) ) {
			$queries[ $dkey ] = $parent_query[ $dkey ];
		} else {
			$queries[ $dkey ] = $dvalue;
		}
	}

	// Validate the dates passed in the query.
	if ( $this->is_first_order_clause( $queries ) ) {
		$this->validate_date_values( $queries );
	}

	// Sanitize the relation parameter.
	$queries['relation'] = $this->sanitize_relation( $queries['relation'] );

	foreach ( $queries as $key => $q ) {
		if ( ! is_array( $q ) || in_array( $key, $this->time_keys, true ) ) {
			// This is a first-order query. Trust the values and sanitize when building SQL.
			$cleaned_query[ $key ] = $q;
		} else {
			// Any array without a time key is another query, so we recurse.
			$cleaned_query[] = $this->sanitize_query( $q, $queries );
		}
	}

	return $cleaned_query;
}

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