Numbers

// Generate a random number
srand ();
$random_number = rand(0,10); //lower and higher ends of range
 
// Check whether one number is divisible by another as a whole number
// Returns the remainder only - therefore a zero equals a whole number
 
$divisible = $number_to_check % $divisible_by;
 
// Formatting numbers
 
// Zero padded numbers
$date = sprintf("%04d-%02d-%02d", $year, $month, $day);
 
// Setting decimal places
$amount = sprintf("%01.2f", $total);
 
// Formatting a number with commas, no decimal places
$num = number_format($num);
 
// Formatting a number with commas, 2 decimal places
$num = number_format($num, 2);
 
// Round to the nearest .05
$price = round(($amount/.05)*.05);
 
// Round down to nearest 10
$result = ($num % 10 >= 10 ? ceil($num / 10)*10 : floor($num / 10)*10);
 
// Number of one hundredths round up
$number = ceil($amount / 100);