There are so many things in life that one needs to think about, and I am no differnt with the same problem as every one else getting a job be it a on campus, H1B.
If you want to know that the argument supplied is a file or not use is_file() file_exists() will take both file and directory as input and return true if they exists. So, unless you specifically want to check if the argument passed is a file use is_file otherwise use file_exists()
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