is_float

I am trying to validate a float. I need to test if a string variable is a float. i tried the is_float function but it doesnt seem to work with string variables


$duration=$_POST['duration'];

if(!is_float($duration))
{
die ('<div style="clear:both;float:left;"><h3>Sorry your duration must be a number in hours.</h3>
<table><tr><td>Click here to go back -</td><td> <a href="?area=1" class="button" >Back </a></td></tr></table></div></div>');
}

is_float doesn't work with strings.

Try converting $duration to an integer first using the intval() function.

HTH
Dan

Hi thanks for the suggestion. However will converting my string in to an interger truncate the decimal digits? As the user may have inputed 1.5 as the duration.

You can use floatval() to convert it to a float.

floatval() will turn anything (scalar) into a float, so probably not very useful:

var_dump(is_float(floatval('hello')));
//output=bool(true)


will is_numeric() not do what you want? (http://php.net/is-numeric)

Thanks GJay thats the code i was looking for and now i look its right there on php.net silly me thanks guys :-)

Hi thanks for the suggestion. However will converting my string in to an interger truncate the decimal digits? As the user may have inputed 1.5 as the duration.


oh my bad, I was thinking of int as meaning any number value, sorry!

Dan