require,include,require_once和include_once之间的区别? [英] Difference between require, include, require_once and include_once?
问题描述
在PHP中:
- 我应该何时使用
require
vs.include
? - 我应该何时使用
require_once
与include_once
?
- When should I use
require
vs.include
? - When should I use
require_once
vs.include_once
?
推荐答案
有还要求
和 include_once
。
所以你的问题应该是...
So your question should be...
- 我应该何时使用
require
与include
? - 我应该何时使用
require_once
与要求
- When should I use
require
vs.include
? - When should I use
require_once
vs.require
1的答案描述为这里。
require()函数与include()相同,除了它处理错误不同。如果发生错误,include()函数会生成警告,但脚本将继续执行。 require()生成致命错误,脚本将停止。
The require() function is identical to include(), except that it handles errors differently. If an error occurs, the include() function generates a warning, but the script will continue execution. The require() generates a fatal error, and the script will stop.
可以找到2的答案这里。
require_once()语句与require()相同,除了PHP将检查文件是否已被包含,如果是,则不再包括(require)它。
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.
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