php - require，include，require_once和include_once之间的区别？(Difference between require, include, require_once and include_once?)

Question

In PHP:

(在PHP中：)

• When should I use require vs. include ?

  (什么时候应该使用require与include ？)

• When should I use require_once vs. include_once ?

  (什么时候应该使用require_once和include_once ？)

  ask by Scott B translate from so

Answer 1

There are require and include_once as well.

(还有require和include_once 。)

So your question should be...

(所以你的问题应该是...)

1. When should I use require vs. include ?

   (什么时候应该使用require与include ？)

2. When should I use require_once vs. require

   (我何时应该使用require_once与require)

The answer to 1 is described here .

(这里描述1的答案。)

The require() function is identical to include(), except that it handles errors differently.

(require（）函数与include（）相同，除了它对错误的处理方式不同。)

If an error occurs, the include() function generates a warning, but the script will continue execution.

(如果发生错误，include（）函数将生成警告，但脚本将继续执行。)

The require() generates a fatal error, and the script will stop.

(require（）产生致命错误，脚本将停止。)

The answer to 2 can be found here .

(在这里可以找到2的答案。)

The require_once() statement is identical to require() except PHP will check if the file has already been included, and if so, not include (require) it again.

(require_once（）语句与require（）相同，除了PHP会检查文件是否已包含，如果不包含，则不要再次包含（require）该文件。)