PHP Functions Essential Reference

hexdec

int hexdec(string hex) 

Returns the decimal value for the given hexadecimal argument.

Returns:

Integer decimal equivalent of a number

Description:

Converts a hexadecimal number represented as a string into its decimal equivalent. If the string is not a valid hexadecimal number, an error is returned. The largest hexadecimal value that can be converted is 0x7fffffff.

You can include the 0x prefix in the hex string or not; hexdec() works regardless.

Version:

PHP 3, PHP 4

See also:

base_convert() 
bindec() 
decbin() 
dechex() 
decoct() 
octdec() 

Example:

Get the decimal value for a hexadecimal expression

$hex = "11ff"; echo "Hexadecimal: $hex, Decimal: ", hexdec($hex);