Display Size and maybe download time

BobbyDouglas · #1 28-Oct-2003, 11:34

I want to be able to display the size of an image. If possilbe, also the download time it will take.

So it will first check the time it takes to download a specific file size. Then it will determine how long it will take, in terms of seconds, to download a specific file.

http://mrbobdouglas.com/photoshop/ is what page I would use this on.

What I want to do is just do something like <displaysize> then it will display the size of that particular image. If possible, it will show the amount of time to download it as well.

Any ideas on this?

JdS · #2 02-Nov-2003, 16:13

Tell me if this works out for you:

PHP Code:


<?php
// the image file
$img_file = '/home/mrbobdou/public_html/images/someimage.gif';

//////////////////////////////////
//   Some required functions
//////////////////////////////////
function calc_download_time( $Kb, $speed=28.8 )
{
   $speed = floatval( $speed );
   $Kb = floatval( $Kb );
   return( ceil($Kb / $speed) );
}

function convert_from_bytes( $bytes, $to=NULL )
{
   $float = floatval( $bytes );
   switch( $to )
   {
      case 'Kb' :            // Kilobit
         $float = ( $float*8 ) / 1024;
         break;
      case 'b' :             // bit
         $float *= 8;
         break;
      case 'GB' :            // Gigabyte
         $float /= 1024;
      case 'MB' :            // Megabyte
         $float /= 1024;
      case 'KB' :            // Kilobyte
         $float /= 1024;
      default :              // byte
   }
   unset( $bytes, $to );
   return( $float );
}

function get_image_size( $path2image )
{
   $img_size = 0;
   if( @file_exists($path2image) )
   {
      $contents = file_get_contents( $path2image );
      $img_size = strlen( $contents );
      unset( $contents );
   }
   else
   {
      trigger_error( '0 filesize returned for non-existant image file', E_USER_WARNING );
   }
   return( $img_size );
}
//////////////////////////////////


// get the image file size
$bytes = get_image_size( $img_file );

// convert the bytes into KiloBYTES
$KB = convert_from_bytes( $bytes, 'KB' );
  // format it to 1 decimal place
   $file_size = number_format( $KB, 1 );

// convert the bytes into KiloBITS
$Kb = convert_from_bytes( $bytes, 'Kb' );
  // calculate estimated time of download for 56Kbps modem
  $dl_time = calc_download_time( $Kb, 56 );

echo "<p>Image size: $file_size KB<br />\r\n";
echo "Estimated download time: $dl_time secs. [56Kbps]</p>\r\n";
?>

BobbyDouglas · #3 07-Nov-2003, 09:38

Sorry to be so late to respond, its been a very busy week.

Anyways, I uploaded the code, http://mrbobdouglas.com/test/scripts...play/index.php Works fine so far. Is there a way to calculate the speed of the user, and then figure out the download time? If thats very complicated to do then lets not bother with it.

How long did it take for you to type up the entire code to what it is right now?

1 more thing. I have about 4-5 images that I am going to make ready for download... Is there a way I can define 4-5 different sets, and then call them using like <$img1> or something to the effect?

Thanks a lot by the way

JdS · #4 07-Nov-2003, 10:42

Quote:

Originally posted by BobbyDouglas
Sorry to be so late to respond, its been a very busy week.

Anyways, I uploaded the code, http://mrbobdouglas.com/test/scripts...play/index.php Works fine so far. Is there a way to calculate the speed of the user, and then figure out the download time? If thats very complicated to do then lets not bother with it.

If there's a way, I don't know it ... yet!

Quote:

How long did it take for you to type up the entire code to what it is right now?

Not more than 30 minutes, I think!? Why?

Quote:

1 more thing. I have about 4-5 images that I am going to make ready for download... Is there a way I can define 4-5 different sets, and then call them using like <$img1> or something to the effect?

Thanks a lot by the way

I knew you would be asking me this sooner or later.... but you'd have to wait a bit for me to paste some code next - for now I have to settle my domain name transfer thingy first.... I am running out of time!

BobbyDouglas · #5 07-Nov-2003, 11:42

Quote:

Not more than 30 minutes, I think!? Why?

- Just because its something so simple, but it seems so complicated to me. I wish I knew how to write code like that so fast. I really need to buy a PHP book. Sooner or later I will.

Quote:

I knew you would be asking me this sooner or later.... but you'd have to wait a bit for me to paste some code next - for now I have to settle my domain name transfer thingy first.... I am running out of time!

- Its not a problem. Whenever you get a chance.

JdS · #6 08-Nov-2003, 01:18

Quote:

1 more thing. I have about 4-5 images that I am going to make ready for download... Is there a way I can define 4-5 different sets, and then call them using like <$img1> or something to the effect?

OK, let's assume you want to offer the following images for download

Code:

my_dog.jpg
my_cat.jpg
my_hamster.jpg

Also assume that these files are located in one location on your webserver e.g. /home/mybobdou/public_html/images/download/

The newer version of the sample code/page above could look something like this now:

PHP Code:


<?php
// the images for downloading
$imgs[]  = 'my_dog.jpg';
$imgs[]  = 'my_cat.jpg';
$imgs[]  = 'my_hamster.jpg';

// define the url to link to the images
// e.g. <a href="/images/download/my_dog.jpg">my_dog.jpg</a>
define( 'URL_IMAGES_DOWNLOAD', '/images/download/' );

// define the path to these images
define( 'PATH_IMAGES_DOWNLOAD', '/home/mybobdou/public_html'.URL_IMAGES_DOWNLOAD );

//////////////////////////////////
//   Some required functions
//////////////////////////////////
function display_image_download_link( $img )
{
  // get the image file size
  $bytes = get_image_size( PATH_IMAGES_DOWNLOAD.$img );
  
  // convert the bytes into KiloBYTES
  $KB = convert_from_bytes( $bytes, 'KB' );
    // format it to 1 decimal place
    $file_size = number_format( $KB, 1 );

  // convert the bytes into KiloBITS
  $Kb = convert_from_bytes( $bytes, 'Kb' );
    // calculate estimated time of download for 56Kbps modem
    $dl_time = calc_download_time( $Kb, 56 );
  
  echo "  <li><a href=\"".URL_IMAGES_DOWNLOAD."$img\">$img</a> ".
       "[size: $file_size KB] ".
       "[est. download time (56Kbps): $dl_time secs.]</li>\r\n";
  unset( $img, $bytes, $KB, $Kb, $file_size, $dl_time );
}

function calc_download_time( $Kb, $speed=28.8 )
{
   $speed = floatval( $speed );
   $Kb = floatval( $Kb );
   return( ceil($Kb / $speed) );
}

function convert_from_bytes( $bytes, $to=NULL )
{
   $float = floatval( $bytes );
   switch( $to )
   {
      case 'Kb' :            // Kilobit
         $float = ( $float*8 ) / 1024;
         break;
      case 'b' :             // bit
         $float *= 8;
         break;
      case 'GB' :            // Gigabyte
         $float /= 1024;
      case 'MB' :            // Megabyte
         $float /= 1024;
      case 'KB' :            // Kilobyte
         $float /= 1024;
      default :              // byte
   }
   unset( $bytes, $to );
   return( $float );
}

function get_image_size( $path2image )
{
   $img_size = 0;
   if( @file_exists($path2image) )
   {
      $contents = file_get_contents( $path2image );
      $img_size = strlen( $contents );
      unset( $contents );
   }
   else
   {
      trigger_error( '0 filesize returned for non-existant image file', E_USER_WARNING );
   }
   return( $img_size );
}
//////////////////////////////////

echo "<ul>\r\n";
foreach( $imgs as $img )
{
  display_image_download_link( $img );
}
echo "</ul>\r\n";
?>

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Display Size and maybe download time

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