php man page for abs

ABS(3)									 1								    ABS(3)

abs - Absolute value

SYNOPSIS
       number abs (mixed  $number)

DESCRIPTION
	Returns the absolute value of $number.

PARAMETERS
	      o $number
		- The numeric value to process

RETURN VALUES
	The  absolute value of $number. If the argument $number is of type float, the return type is also float, otherwise it is integer (as float
       usually has a bigger value range than integer).

EXAMPLES
       Example #1

	      abs(3) example

	      <?php
	      echo abs(-4.2); // 4.2 (double/float)
	      echo abs(5);    // 5 (integer)
	      echo abs(-5);   // 5 (integer)
	      ?>

SEE ALSO
       gmp_abs(3), gmp_sign(3).

PHP Documentation Group 														    ABS(3)