Is there a function that will automatically count the bytes in a variable?

[blurredvision]

I'm in need of the ability to be able to count the bytes of a variable to use in an equation.  I'd imagine something exists to do this, I just don't know what it is.

 

Thanks for any help!

[MadTechie]

try this *untested*

 

    /**
     * Count the number of bytes of a given string.
     * Input string is expected to be ASCII or UTF-8 encoded.
     * Warning: the function doesn't return the number of chars
     * in the string, but the number of bytes.
     *
     * @param string $str The string to compute number of bytes
     *
     * @return The length in bytes of the given string.
     */
    function strBytes($str)
    {
      // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
     
      // Number of characters in string
      $strlen_var = strlen($str);

      // string bytes counter
      $d = 0;
     
     /*
      * Iterate over every character in the string,
      * escaping with a slash or encoding to UTF-8 where necessary
      */
      for ($c = 0; $c < $strlen_var; ++$c) {
         
          $ord_var_c = ord($str{$d});
         
          switch (true) {
              case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                  // characters U-00000000 - U-0000007F (same as ASCII)
                  $d++;
                  break;
             
              case (($ord_var_c & 0xE0) == 0xC0):
                  // characters U-00000080 - U-000007FF, mask 110XXXXX
                  // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                  $d+=2;
                  break;

              case (($ord_var_c & 0xF0) == 0xE0):
                  // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                  // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                  $d+=3;
                  break;

              case (($ord_var_c & 0xF8) == 0xF0):
                  // characters U-00010000 - U-001FFFFF, mask 11110XXX
                  // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                  $d+=4;
                  break;

              case (($ord_var_c & 0xFC) == 0xF8):
                  // characters U-00200000 - U-03FFFFFF, mask 111110XX
                  // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                  $d+=5;
                  break;

              case (($ord_var_c & 0xFE) == 0xFC):
                  // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                  // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                  $d+=6;
                  break;
              default:
                $d++;   
          }
      }
     
      return $d;
    }

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Woah!  Thanks MadTechie, didn't know that it would be so much work, I was hoping there would be a built-in function, otherwise I would've done more research myself instead of you typing all that out.  I'll give that look, though, thanks.