Other Functions

abs($x)	Returns the absolute value of the operand
sqrt($x)	Returns the square root of the operand
round($x, precision)	Returns the operand, rounded to the number of decimal places specified.
floor($x) & ceil($x)	Returns the largest integer less than or equal to (floor) or the smallest integer greater than or equal to (ceil) the operand.
is_numeric($x)	Returns true if the operand is numeric, otherwise returns false.
print($x) & echo($x, $y)	Output a string. If you have multiple operands (comma separated), then you must use echo().
rand(min, max)	Returns a psudorandom number from min to max, inclusive.
date(format, $timestamp)	Returns a formatted date/time. If no timestamp is provided, the current system date and time are used.