(PHP 4, PHP 5, PHP 7, PHP 8)
dechex — Decimal to hexadecimal
Returns a string containing a hexadecimal representation of the given unsigned num
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() returning ffffffff
.
num
The decimal value to convert.
As PHP's int type is signed, but dechex() deals with unsigned integers, negative integers will be treated as though they were unsigned.
Hexadecimal string representation of num
.
Example #1 dechex() example
<?php
echo dechex(10) . "\n";
echo dechex(47);
?>
The above example will output:
a 2f
Example #2 dechex() 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)."\n";
echo dechex(PHP_INT_MAX * 2 + 1)."\n";
echo dechex(pow(2, 32) - 1)."\n";
?>
The above example will output:
ffffffff ffffffff ffffffff