PHP Integer Format

<?php

$number = 0x12A;

$string = '0x12A';

// direct decoding
echo hexdec($string);

// the reverse way
$newString = '0x'.dechex($number);

?>

PHP has several convenient integer format to write them in a proper way: 0x12F, 0b110101, 0o12367. This works well as part of the code

When such formats are provided as a string, it may be processed with the ad hoc native functions such as hexdec(), bindec() or octdec() : they convert a number between bases, and they also accept the native PHP formats.

For the reverse operation, the reverse functions are also useful, with an extra header for the format.

See Also

• Integer (PHP manual)

• hexdec

• octdec

• bindec

• dechexdec

• decoctdec

• decbindec

• converting and back [Try me]

PHP Features

• integer

• format

• eval

Last updated: 14 July 2026