bin2hex
    (PHP 3 >= 3.0.9, PHP 4, PHP 5)
bin2hex -- 
     Convert binary data into hexadecimal representation
    
Description
string 
bin2hex ( string str )
     Returns an ASCII string containing the hexadecimal representation
     of str. The conversion is done byte-wise
     with the high-nibble first.
    
     See also pack() and unpack().