有没有大神帮忙把这个java加密代码写成php版本的哦

[你存在我婶婶的脑海里]

public final class MD5
{
  public static String digest(String txt) {
    try {
      MessageDigest md = MessageDigest.getInstance("MD5");
      md.update(txt.getBytes("UTF-8"));
      
      return toHex(md.digest());
    }
    catch (NoSuchAlgorithmException e) {
      return "";
    } catch (UnsupportedEncodingException e) {
      return "";
    } 
  }





  
  public static String digest(String txt, boolean toLowerCase) {
    if (toLowerCase) {
      return digest(txt).toLowerCase();
    }
    return digest(txt);
  }
  private static final char[] hexDigits = { 
      '0', '1', '2', '3', '4', '5', 
      '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

  
  private static String toHex(byte[] byteArray) {
    char[] resultCharArray = new char[byteArray.length * 2];
    int index = 0; byte b1; int i; byte[] arrayOfByte;
    for (i = arrayOfByte = byteArray.length, b1 = 0; b1 < i; ) { byte b = arrayOfByte[b1];
      resultCharArray[index++] = hexDigits[b >>> 4 & 0xF];
      resultCharArray[index++] = hexDigits[b & 0xF]; b1++; }
    
    return new String(resultCharArray);
  }
}

使用 MD5.digest("要加密的字符串");