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Home Backend Development PHP Tutorial if (FILE == '')这个代码用意是什么,什么情况下FILE 会是空的

if (FILE == '')这个代码用意是什么,什么情况下FILE 会是空的

Jun 23, 2016 pm 01:07 PM

ecshop中的init.php文件中有这样一段代码

if (__FILE__ == '')  //这行没想明白,有写的必要吗,当前文件的绝对路径什么情况下会是空的??
{
    die('Fatal error code: 0');
}


回复讨论(解决方案)

__FILE__ 表示当前文件的文件名
不可能为空



这么写应该有他的用意,只是没想明白为什么这么写

__FILE__ 表示当前文件的文件名
不可能为空



ecshop应该不会无缘无故写这么一句判断,我想应该有什么必要性


文件名也有可能是空的

如果非要说什么情况为空  你把它的值改成 空了,那它不就空了,除非不能改

如果非要说什么情况为空  你把它的值改成 空了,那它不就空了,除非不能改

魔术常量应该不能赋值吧,你说的是文件名改空吧


文件名也有可能是空的

也有可能是路径


文件名也有可能是空的

也有可能是判断__FILE__是否存在,也就是兼容性判断,但感觉好像也没这个必要,__FILE__很早的PHP版本就 有了
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