the difference between require and require_once. I just want to know the difference rather than Warning and Fatal Error in php.
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1require_once is slower. Whether or not the difference will be significant depends on your particular code. – Dave Jan 09 '15 at 19:08
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if you search that question at google you would get lots of answer – Shaiful Islam Jan 09 '15 at 19:17
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require() includes and evaluates a specific file, while require_once() does that only if it has not been included before (on the same page).
So, require_once() is recommended to use when you want to include a file where you have a lot of functions for example. This way you make sure you don't include the file more times and you will not get the "function re-declared" error.