PHP Manual: Hexadecimal to decimal

Description

intfloat hexdec(string $hex_string)

Returns the decimal equivalent of the hexadecimal number represented by the hex_string argument. hexdec converts a hexadecimal string to a decimal number.

hexdec will ignore any non-hexadecimal characters it encounters. As of PHP 7.4.0 supplying any invalid characters is deprecated.

Parameters

hex_string: The hexadecimal string to convert

Return Values

The decimal representation of hex_string

Changelog

Version	Description
7.4.0	Passing invalid characters will now generate a deprecation notice. The result will still be computed as if the invalid characters did not exist.

Examples

Example #1 hexdec example

<?php
var_dump(hexdec("See"));
var_dump(hexdec("ee"));
// both print "int(238)"

var_dump(hexdec("that")); // print "int(10)"
var_dump(hexdec("a0")); // print "int(160)"
?>

Notes

Note:
The function can convert numbers that are too large to fit into the platforms int type, larger values are returned as float in that case.

hexdec