CPU usage with file_exists in php

Question

I own a site with a high httpd processor per minute. I noticed that I use "file_exists" for every httpd request. Is this feature very heavy?

Answer 1

This function will only check for the presence of a file - which means access to the disk (which may take a little time, but not so much)

Given that your application is probably made up of dozens (if not hundreds) of PHP files that you need to read for each request, I don’t think that one file_existsmatters.

(Well, at least while you check the file on the local drive - do not miss a single network drive or something like that)

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Answer 2

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Answer 3

file_exists is usually very cheap, especially since the result is cached in php stat cache . Areas such as heavy databases are typically the largest processor consumer.

try profiling to determine which part of your application uses the most time, some examples here:

http://www.ibm.com/developerworks/opensource/library/os-php-fastapps2/