PHP Manual: hexdec

Description

function hexdec(string $hex_string): int|float

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("ee")); // prints "int(238)"
var_dump(hexdec("a0")); // prints "int(160)"
?>

Example #2 hexdec() with Invalid Characters

<?php
var_dump(hexdec("See"));  // print "int(238)"
var_dump(hexdec("that")); // print "int(10)"
?>

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