Hexadecimal Integer

Hexadecimal integers are integers with an hexadecimal representation. Their value is the same, yet their are written in a different way than the common decimal.

Hexadecimal has native support in PHP with the 0x123 format. There is also support for hexadecimal characters, inside double-quote strings, with the \xhh syntax.

There are functions to convert from and to hexadecimal format: hexdec(), dechex() and base_convert(), from ten to sixteen, and then, with an arbitrary base, up to 36.

PHP also has special syntax for binary and octal numbers.

<?php

    $twenty    = 0x14;
    $twentyToo = 20;

    $i = "\x69"; // i is the 105 ASCII code
    $i = 'i';

?>

Documentation

See also Hexadecimal on Wikipedia.

Related : Binary Integer, Octal Integer, Floating Point Numbers, Base