Re: PHP Split function

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PHP Split function

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Join Date: May 2008

Posts: 31

Reputation: rgviza is an unknown quantity at this point

Rep Power: 1

Solved Threads: 5

rgviza

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Re: PHP Split function

May 15th, 2008

The cleanest way to handle this is:

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$id='ha12345';

switch(true)
{
  case preg_match("/^\w{2}\d{5}$/",$id):
         //user is LLNNNNN
         echo "LLNNNNN";
         break;
  case preg_match("/^\w{3}$/",$id):
         //user is LLL
         echo "LLL";
         break;
  default:
         //put login error here. use "username or password" is wrong so they
         //can't brute-guess your id format or ids. You also don't want to mention
        //"incorrect format".
}

For lots of regex goodness go here for tutorial. It's for .Nut but regex works the same way for any perl compatible regex and this tutorial is really easy to understand compared to others.

Insight into this particular regex.
each significant part is followed by the explanation in brackets:
/^[from start of string]\w{2}[expect 2 word characters]\d{5}[then 5 numeric digits]$[then end of string]/

This way 1234-ha12345-3242lkj won't match, even though there is a LLNNNNN substring in it.

preg_match returns boolean so you can use it wherever true or false will trip a condition, like in an if, or while, whatever. It is very flexible and powerful but not the most efficient.

Last edited by rgviza : May 15th, 2008 at 2:52 pm.

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Re: PHP Split function

PHP Split function

Re: PHP Split function