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Is it safe to directly access superglobals with?
It is safe to use isset function in super globals. It is very effective to trigger events for a specific submit event. It only checks if the global variable is existing and will not trigger any damage such as XSS/Code/SQL injection. I think the recommendation you received to change the code is that you need to…
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What do you mean by superglobals in PHP?
Several predefined variables in PHP are “superglobals”, which means they are available in all scopes throughout a script. There is no need to do global $variable; to access them within functions or methods. By default, all of the superglobals are available but there are directives that affect this availability.
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Is it necessary to filter the superglobal value?
Instead, some kind of filtering should be done, and that’s what the hint suggests. Filter the superglobal value in case it has some poisoned content. I agree with the other answerers that in most cases (almost always) it is necessary to sanitize Your input.
Why are superglobals usually filled with user input?
The reason why it has been added is because superglobals usually are filled with user input, which shouldn’t ever be blindly trusted. Instead, some kind of filtering should be done, and that’s what the hint suggests.
Is it possible to directly modify superglobals in PHP?
Unless you code is short enough (say, less than 50 lines long), modifying those super-global would only make your code harder to maintain and to undersand. By the way you don’t need to pass $_POST to the function, since it’s a superglobal array that can ben accessed even within the local scope of a function.