Validate field is number with decimal?!?

[jmansa]

How can I validate a field when submitting to be a number with 1 decimal?!?! Normally when I validate I do it like this:

if(!$fieldname){

	$err_fieldname = '<font style="color:#FF0000;">'._ERROR.'!</font>';
	CreateForm();

}

I have seen some workarounds with js, but is it possible with pure PHP?

[laserlight]

With such specific requirements you may find it useful to validate with regular expressions, e.g, [man]preg_match/man.

[bradgrafelman]

Also note that your example 'validation' isn't really a good 'validation' depending upon your requirements and how $fieldname is defined.