PHP Manual . ... Next . PHP 3 <= 3.0.18, PHP 4 >= 4.0.0) hexdec -- Hexadecimal to decimal . int 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. ... Example 1. hexdec() example . var_dump(hexdec("See")); var_dump(hexdec("ee")); // both prints "int(238)" var_dump(hexdec("that")); var_dump(hexdec("a0")); // both prints int(160) . ...