关于php的include的一道面试题？
以下代码能正常执行吗？如果能 会有什么问题？
- PHP code
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if($condiation)
include('a.php');
else
require_once('b.php');
不知道求解答
------解决方案--------------------
include()会产生一个警告，而require()则导致一个致命的错误(出现错误，脚本停止执行)++
------解决方案--------------------
include和include_once两个如果请求不到文件会报warning
程序还会继续执行
可以用在ifelse语句中
而require和require_once不同 如果请求不到文件会发生致命错误.并且脚本终止执行
并且无论require_once和require是否能够得到执行权限.在实际中写有require和require_once的代码行都会被执行.这个和PHP的执行机制有关系.
所以上面的代码.能够执行.执行的结果就是
条件成立的情况下如果请求道a.php和b.php那么不会报错.如果请求到a.php但没有b.php会报致命错误.如果请求到b.php而没有请求到a.php那么会报警告.如果两个文件都不存在.会报警告和致命错误.
如果条件不成立
效果类似上面只是没有警告了.
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