How to convert php string to hexadecimal string

How to convert php string to hexadecimal: first create a PHP sample file; then convert the string to hexadecimal through the String2Hex method; and finally return the conversion result through return.

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Conversion of PHP strings and hexadecimal encoding

php string is decimal

/**
**字符串转16进制
**/
 public function String2Hex($string){
        $hex='';
        for ($i=0; $i < strlen($string); $i++){
            $hex .= dechex(ord($string[$i]));
        }
        return $hex;
    }
/**
**16进制转字符串
**/
    public function Hex2String($hex){
        $string=&#39;&#39;;
        for ($i=0; $i < strlen($hex)-1; $i+=2){
            $string .= chr(hexdec($hex[$i].$hex[$i+1]));
        }
        return $string;
    }
// example:
$hex = String2Hex("test sentence...");
// $hex contains 746573742073656e74656e63652e2e2e
echo Hex2String($hex);
// outputs: test sentenc

I found a problem when doing aes encryption. I found that when converting the string to hexadecimal, there will be a problem that the number of converted data does not match. It can be modified as Try the following:

 public function String2Hex($string){
        $hex='';
//        for ($i=0; $i < strlen($string); $i++){
//            $hex .= dechex(ord($string[$i]));
//        }
        $hex = bin2hex($string);
        return $hex;
    }

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