Library code snippets

Determine if a variable is numeric

By James Crowley, published on 28 Sep 2001
James Crowley James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...

There are a number of ways to determine if a variable in PHP is numeric. If you have PHP 4, you can use the is_numeric function:

if (is_numeric($thefield)==false) {
  echo "\$thefield is not a number";
}

If you have PHP 3, then you can use the following function

function is_numeric($value) {
  if (((int) $value)== $value) {
    return true;
  } else {
    return false;
  }
}

Related tags

php

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  1. Developer Fusion Bot
    01 Jan 1999 at 00:00

    This thread is for discussions of Determine if a variable is numeric.

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