php man page for dechex

DECHEX(3)								 1								 DECHEX(3)

dechex - Decimal to hexadecimal

SYNOPSIS
       string dechex (int  $number)

DESCRIPTION
	Returns a string containing a hexadecimal representation of the given unsigned $number argument.

	The largest number that can be converted is PHP_INT_MAX
	* 2 + 1 (or -1): on 32-bit platforms, this will be 4294967295 in decimal, which results in dechex(3) returning ffffffff.

PARAMETERS
	      o $number
		-  The	decimal  value to convert.  As PHP's integer type is signed, but dechex(3) deals with unsigned integers, negative integers
		will be treated as though they were unsigned.

RETURN VALUES
	Hexadecimal string representation of $number.

EXAMPLES
       Example #1

	      dechex(3) example

	      <?php
	      echo dechex(10) . "
";
	      echo dechex(47);
	      ?>

	      The above example will output:

	      a
	      2f

       Example #2

	      dechex(3) example with large integers

	      <?php
	      // The output below assumes a 32-bit platform.
	      // Note that the output is the same for all values.
	      echo dechex(-1)."
";
	      echo dechex(PHP_INT_MAX * 2 + 1)."
";
	      echo dechex(pow(2, 32) - 1)."
";
	      ?>

	      The above example will output:

	      ffffffff
	      ffffffff
	      ffffffff

SEE ALSO
       hexdec(3), decbin(3), decoct(3), base_convert(3).

PHP Documentation Group 														 DECHEX(3)