They share the same file list, so you don't need to worry about mixing them - a file included with require_once will not be included again by include_once.〔【出典】PEAR ◆【License】Open Publication License ◆【編集】独立行政法人情報通信研究機構 〕
When top-level require_once is mixed with conditional require_once, this can result in code that is uncacheable by opcode caches such as APC (to be bundled with PHP 6).〔【出典】PEAR ◆【License】Open Publication License ◆【編集】独立行政法人情報通信研究機構 〕
The employer shall, when using steel pipes of the same or similar outer diameter and thickness which differ in strength in the same workplace, in order to prevent dangers to workers due to confused use of such steel pipes, take measures to distinguish the strength by colouring on pipe surface, affixing symbols, etc.〔【出典】日本法令外国語訳データベースシステム 〕
(ii) When the method set forth in (a) of the preceding item is to used, take measures to prevent confusing the grounding conductor and an electric conductor connected to the electrical circuit, and the grounding terminal and a terminal connected to the electrical circuit.〔【出典】日本法令外国語訳データベースシステム 〕