I'm aware of making ranges:
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$alphabet=(range('a', 'z')Can you put more than one array/variable into the in_array function and it still work?
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$lowercase=(range('a','z');
$uppercase=(range('A','Z');
//Put both of the above variables into an in_array functionPart 2-
In a PHP/MySQL/HTML environment, what characters are not safe to use and can compromise security in an environment?