WP::build_query_string()

Source

public function build_query_string() {
	$this->query_string = '';

	foreach ( (array) array_keys( $this->query_vars ) as $wpvar ) {
		if ( '' !== $this->query_vars[ $wpvar ] ) {
			$this->query_string .= ( strlen( $this->query_string ) < 1 ) ? '' : '&';

			if ( ! is_scalar( $this->query_vars[ $wpvar ] ) ) { // Discard non-scalars.
				continue;
			}

			$this->query_string .= $wpvar . '=' . rawurlencode( $this->query_vars[ $wpvar ] );
		}
	}

	if ( has_filter( 'query_string' ) ) {  // Don't bother filtering and parsing if no plugins are hooked in.
		/**
		 * Filters the query string before parsing.
		 *
		 * @since 1.5.0
		 * @deprecated 2.1.0 Use 'query_vars' or 'request' filters instead.
		 *
		 * @param string $query_string The query string to modify.
		 */
		$this->query_string = apply_filters_deprecated(
			'query_string',
			array( $this->query_string ),
			'2.1.0',
			'query_vars, request'
		);

		parse_str( $this->query_string, $this->query_vars );
	}
}

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