arrays - PHP print hex values of characters in a string -

i want print hexadecimal values of each of characters in php string. example, want display hex values of each character in string i'm trying set fourth character control-c (0x03).

$str=sprintf('ab1%c',0x03); ($cnt=0; $cnt<4; $cnt++) {     $chr=$str[$cnt];     echo '$str['.$cnt.'] = "'.$str[$cnt].'" = '.sprintf('0x%02x',$chr[0])."\n"; } var_dump(str_split($str)); 

what this:

$str[0] = "a" = 0x00 $str[1] = "b" = 0x00 $str[2] = "1" = 0x01 $str[3] = "" = 0x00 array(4) {   [0]=>   string(1) "a"   [1]=>   string(1) "b"   [2]=>   string(1) "1"   [3]=>   string(1) "" } 

it seems $chr string rather character , sprintf() printing integer value of string - 0 - instead of integer value of single character.

is possible in php? sure there's way...

php not have char (character) type. correct getting 1-character string result.