PHP woes : checking if value is numeric

paul · #1 (**permalink**) 22-02-2007, 09:23 PM

I'm using this function from PHP: is_numeric - Manual

PHP Code:

   function is_whole_number($var){
  return (is_numeric($var)&&(intval($var)==floatval($var)));
}

Now this works to see if the input is a numeral. But what should I do to check if the value is set in the first place ? I tried PHP: isset - Manual isset but that didn't swing it.

I'm sure it's something obvious I am missing. Any hints ? Thanks ?

louie · #2 (**permalink**) 22-02-2007, 09:41 PM

you do the isset() before calling the function

PHP Code:

   is_whole_number($var)

paul · #3 (**permalink**) 22-02-2007, 10:14 PM

Thanks Louie for the help

Still having problems though

PHP Code:

  function is_whole_number($var){
  return (is_numeric($var) && (intval($var)==floatval($var)) && ($var!=NULL) );
}

if ( isset($_POST[checkit]) && is_whole_number($_POST[checkit])){
// do
}else {
// no do
}

still bails out when I don't have a value in my form to check.

I have an input box that I want people to either leave blank, or enter a numeral. Otherwise if they enter 'six' or something like that I want it to report the error.

louie · #4 (**permalink**) 22-02-2007, 10:26 PM

don't get it. what format are you loonking to get from the visitor?

like 6.00 or 6

give an example

paul · #5 (**permalink**) 22-02-2007, 10:44 PM

Hi Louie,

I want to make sure that a user gives a whole decimal. The field is four characters long, and I am afraid some bright spark will enter 'five' instead of '5'. So only a whole number will do. No "two" "2,3" or "2.3" values should be accepted only 2.

louie · #6 (**permalink**) 22-02-2007, 10:50 PM

try this:

PHP Code:

   
if (isset($_POST['checkit'])){
  $no_post = trim($_POST['checkit']);
  if(is_numeric($no_post)){
    // do something here cause is number
  }else {
    // no do only numbers
  }  
}else{
  //you haven't enter any numbers
}

paul · #7 (**permalink**) 22-02-2007, 10:59 PM

Thanks mate.

Will check this out tomorrow. Time to call it a day here

paul · #8 (**permalink**) 23-02-2007, 11:20 AM

sorry about this I forgot to mention that if he enters a null value then that is okay.
so logic

Code:

 is NULL == okay proceed
 is ! NULL 
      IS NUMERIC == okay proceed
      IS NOT NUMERIC == give out error.

louie · #9 (**permalink**) 23-02-2007, 11:23 AM

PHP Code:

  if (isset($_POST['checkit'])){

$no_post = trim($_POST['checkit']);

if(is_numeric($no_post)){

// do something here cause is number

}else {

// no do only numbers

} 

}

paul · #10 (**permalink**) 26-02-2007, 02:50 PM

Cheers for your help louie and pointing me in the right direction.

The problem was checking if something was NULL . I used

PHP Code:

  function is_whole_number($var){
  return (is_numeric($var)&&(intval($var)==floatval($var)));
}


function postvars() {
   foreach(func_get_args() as $var) {
  // echo $var. " ". $_POST[$var]." <br/>" ;
       if( $_POST[$var] === '' || is_whole_number($_POST[$var])) return true;
   }
   return false;
}

$happy = (postvars('checkit'));

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