PHP hexdec function

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hexdec

(PHP 3, PHP 4, PHP 5)

Returns the decimal equivalent of the hexadecimal number
represented by the hex_string argument.
hexdec() converts a hexadecimal string to a
decimal number. The largest number that can be converted is
7fffffff or 2147483647 in decimal.
As of PHP 4.1.0, this function can also convert larger numbers. It returns
float in that case.

hexdec() will ignore any non-hexadecimal
characters it encounters.

Example 1. hexdec() example

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)"

See also dechex(),
bindec(),
octdec() and
base_convert().