Library code snippets
Determine if a variable is numeric
By James Crowley, published on 28 Sep 2001
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;
}
}
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 ...
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