create_query_string

/**
	 * クエリ文字列構築
	 *
	 * @param array $params key/value pair
	 *
	 * @return array クエリ文字列
	 */
	public static function get_end_point( $params ) {
	
		// クエリ文字列構築
		$query = array();
		if ( isset( $params['key1'] ) && empty( $params['key1'] ) ) {
			array_push( $query, 'key1=' . $params['key'] );

		}
		if ( isset( $params['key2'] ) && empty( $params['key2'] ) ) {
			array_push( $query, 'key2=' . $params['key2'] );

		}
		if ( isset( $params['key3'] ) && empty( $params['key3'] ) ) {
			array_push( $query, 'key3=' . $params['key3'] );

		}
		$queryStr = implode( '&', $query );
		if ( ! empty( $queryStr ) ) {
			$queryStr = '?' . $queryStr;
		}

		return $queryStr;
	}