dechex

(PHP 4, PHP 5, PHP 7)

Decimal to hexadecimal

string dechex ( int $number )

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() returning ffffffff.

Parameters:

number

The decimal value to convert.

As PHP's integer type is signed, but dechex() deals with unsigned integers, negative integers will be treated as though they were unsigned.

Returns:

Hexadecimal string representation of number.

Examples:

dechex() example

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

The above example will output:

a
2f

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