Question about integers (php) -

possible duplicate:
php: shortest way check if variable contains positive integer?

how know, given variable number without residue (and not negative number)?

like have numbers (each number variable): 5; 6.416; -76; 254.

its better have function, give true or false, like:

number "5" true 6.416 false (has residue "416") -76 false 254 true. 

thanks.

this should it:

function is_positive_int($n) {     return $n && abs(intval($n)) == $n; }