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dechex

PHP function Edit on GitHub ✎

(PHP 4, PHP 5, PHP 7, PHP 8)

Decimal to hexadecimal

Description

dechex(int $num): string

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.

Parameters

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.

Return Values

Hexadecimal string representation of num.

Examples

dechex() example

php

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

The above example will output:

output

a
2f

dechex() example with large integers

php

<?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";
?>