在Windows上的file_exists（）中使用DIRECTORY_SEPARATOR

Question

var_dump(DIRECTORY_SEPARATOR) // string '\' (length=1)
var_dump(file_exists("C:/1212.txt")); // true
var_dump(file_exists("C:\1212.txt")); // false
var_dump(file_exists("C:".DIRECTORY_SEPARATOR."1212.txt")); // false

What does DIRECTORY_SEPARATOR do? Why is the above case false when using DIRECTORY_SEPARATOR?

Answer 1

try:

var_dump(file_exists("C:\\1212.txt"));

The backslash is the escape character to to add one to a string you need to follow it with another.