When I was writing my code in PHP and typed require instead include, I saw there was no difference between them so I want to know the main difference between include_once and require_one and include and require.
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Pranav MS
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Pooja Khatri
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Have you read the [documentation](http://php.net/manual/en/function.include-once.php)? – axiac Aug 10 '17 at 06:17
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require() and require_once() perform the same task except that the second function checks if the PHP script is already included or not before executing it.
(same for include_once() and include())
Pranav MS
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