[Resolved] Checking that a variable is NOT numeric

[Davidc316]

I've been trying to work this out for about 45 minutes and I'm ashamed to say I haven't managed to find the answer.

Basically, I want to check that a textfield that has been submitted via a form is a numeric variable. If the stuff is numeric then cool, the person can stay on the page. But, if the variable is NOT numeric then I want to redirect the person to another page with an error message.

I've been reading up lots of fantastic ways of checking that a variable is numeric (such as the "is_numeric()" function). But I'm not so sure how to check that something is NOT numeric.

I've been trying things like,

if ((is_numeric($year=="false")) {
header ("location: bla bla bla.htm");
}

and...

if ((is_numeric($year==0)) {
header ("location: bla bla bla.htm");
}

and also...

if ((is_numeric($year!==1)) {
header ("location: bla bla bla.htm");
}

...but have had no luck so far.

So, does anyone know how to check that a variable is NOT numeric?

[Tristan_Wells]

This looks like a job for regex. 😃

<?php
function is_string_numeric($string)
 {
   if(preg_match('^[0-9]^',$string))
    {
      return true;
    } else {
      return false;
    }
 }
#-Function use-#
$year = '1990';
if(is_string_numeric($string) == true)
 {
   echo($year.' is valid');
 } else {
   echo($year.' is invalid');
 }
?>

[bubblenut]

or

<?php
if(!is_numeric($string)) {}
if(is_numeric($string)==false) {}
?>

[Davidc316]

Thanks!

Thread resolved. 😃