PHP函数学习：16进制ASCII转化为字符串加密解密

$string = "LockDataV";
$arr1   = str_split($string, 1);
foreach ($arr1 as $akey => $aval) {
  $arr1[$akey] = "0x" . bin2hex($aval);
}
echo "<pre>";
var_dump($arr1);

$arrs1 = [0x4c, 0x6f, 0x63, 0x6b, 0x44, 0x61, 0x74, 0x61, 0x56];
$arr2 = $arr1;
foreach ($arr2 as $skey => $sval) {
  $arr2[$skey] = chr($sval);
}
echo "<pre>";
var_dump($arr2);

echo "<pre>";
$arr3 = implode("", $arr2);
var_dump($arr3);