(PHP 4, PHP 5, PHP 7)
dechex — Decimal to hexadecimal
dechex ( int $number ) : string
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
.
number
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 number
.
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
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https://www.php.net/manual/en/function.dechex.php