Making the form Secure & Restricting Chars

PicoDeath · #1 Aug 2nd, 2007, 18:05

I need to know how i can make my form input box secure, because I've heard of entering something which will then delette your site

I only have one input box so it should be a quick task.

I also need to know how i can restrict characters like @-)("£$%^&*( etc etc. I only want letters & numbers to be entered. Thanks.

karinne · #2 Aug 2nd, 2007, 18:11

Try this - PHP Mail Form: Secure and Protected

PicoDeath · #3 Aug 2nd, 2007, 18:56

That seems far to complex for me to just jump into, got anything a little more less complex and just what i need? I think i just need strip splashes for one.

grahame · #4 Aug 2nd, 2007, 20:00

stripslashes is one of the things you do not want to just add - PHP adds extra slashes to protect the casual user against injection attacks, and you should ONLY use striplashes once you understand how it works.

If you want to check whether a field ONLY contains letters and numbers, you can write:

Code: Select all

if (strspn(strtolower($_REQUEST[myfield]) ,"0123456789abcdefghijklmnopqrstuvwxyz") < strlen($_REQUEST[myfield])) {
    .... problem handling code here
} else { 
    ..... code for good case here
}

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Making the form Secure & Restricting Chars