for converting each character in a string to a string of hex values

stringhex.php

<?PHP


// returns the hex value of a single character (if a string is supplied, only the first character will be processed)
function charhex($c) {
   return dechex(ord($c[0]));
}

// returns the hex values of each character in string with optional delimiter
function stringhex($s,$delimiter="") {
   $ret = "";
   for($i=0;$i<strlen($s);$i++) {
        $ret .= charhex($s[$i]).$delimiter;
   }
   return (strlen($delimiter) ? substr($ret,0,-strlen($delimiter)) : $ret);
}

/*
example code:
echo stringhex("hello world")."\n";
echo stringhex("hello world",":")."\n";
echo stringhex("hello world","::")."\n";
echo stringhex("hello world","\n")."\n";

output:
68656c6c6f20776f726c64
68:65:6c:6c:6f:20:77:6f:72:6c:64
68::65::6c::6c::6f::20::77::6f::72::6c::64
68
65
6c
6c
6f
20
77
6f
72
6c
64
*/