validate form

skyloon · #1 14-Jul-2003, 03:16

how to validate a form?
it will check whether it is empty or not, if yes, it will ask user to enter the value, the value for name can't in the numeric form, the IC Number can't in the string form. it also check the email is in the correct format.
thank you

Garth Farley · #2 14-Jul-2003, 07:20

Validation is essentially a bunch of IF statements, which check if some variable is good or not.

The first & most important is:

PHP Code:


if( !isset($id) ){ // means if $id is *not* set
          //$id is not set
          $pling = true;
}
else{  //it is set!
          $pling = false;
}

Don't do if($id), because if $id is set to zero/false, the if's parameters will be false - even though it's set.

Say to check if $id is an integer between 1 and 100 (inclusive), have this:

PHP Code:


if(is_int($id) && $id <= 100 && $id >= 1){
         //$id is okay
}
else{
         //$id is bad, do something.
}

Checking email addresses is tricky, using things called regular expressions, which essentially define a template for a string, and you see if your email address string fits the template or not.

Thankfully the work is done for you by many people, so do a google or look here: www.zend.com

GF

skyloon · #3 15-Jul-2003, 00:55

thanx a lot

JdS · #4 15-Jul-2003, 09:04

We have a function here to validate email address (syntax): http://www.desilva.biz/forum/viewtopic395.php

As usual, would appreciate feedback if it doesn't work for you (since I personally don't use it much).

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validate form

validating valid email adress syntaxes