- floor: documentation ( source)
<?php
$number = 17.48;
$number = intval(($number*10))/10;
echo $number;
// x.0 if x.1,x.2,x.3 ; x.5 if x.4,x.5,x.6 ; x+1.0 if x.7,x.8,x.9
$whole = floor($number); //integer part
$decimal = $whole - $number; // decimal part
echo $decimal;