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Dynamic Thumbnailing with Imagemagick in PHP

May 27th 2003
10 Comments

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Here is some sample code that allows you to create a thumbnail automatically (assuming ImageMagick is already installed and functional) (based on the imagick PEAR module).

Code for dynamic thumbnails using PHP

<?php

// Specify your file details
$current_file = 'image.jpg';
$max_width = '150';

// Get the current info on the file
$current_size = getimagesize($current_file);
$current_img_width = $current_size[0];
$current_img_height = $current_size[1];
$image_base = explode('.', $current_file);

// This part gets the new thumbnail name
$image_basename = $image_base[0];
$image_ext = $image_base[1];
$thumb_name = $image_basename.'-th.'.$image_ext;

// Determine if the image actually needs to be resized
// and if it does, get the new height for it
if ($current_img_width > $max_width)
{
  $too_big_diff_ratio = $current_img_width/$max_width;
  $new_img_width = $max_width;
  $new_img_height = round($current_img_height/$too_big_diff_ratio);
  // Convert the file
  $make_magick = system("convert -geometry $new_img_width x $new_img_height $current_file $thumb_name", $retval);
  // Did it work?
  if (!($retval)) {
    echo 'Thumbnail created: <img src="' .$thumb_name .'">';
  }
  else {
    echo 'Error: Please try again.';
  }
}
else
{
  echo 'No need to resize.';
}

?>




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10 Comments

  1. Feb 14th, 2004

    ralph hardwick

    I get a division by zero error…any ideas?

  2. Mar 20th, 2004

    Thumbnews

    I also get a division by zero error. Need help.

  3. Oct 18th, 2004

    nick

    That means you didn’t have a file to open/convert

  4. Mar 9th, 2005

    Jason

    this code does not work.

    instead of:

    “system(“convert -geometry $new_img_width x $new_img_height $current_file $thumb_name”, $retval);”

    it needs to be:

    “exec(“convert -geometry $new_img_width x $new_img_height $current_file $thumb_name”, $retval);”

  5. Apr 2nd, 2005

    namdev

    It gives me error

    Warning: getimagesize
    No need to resize

    i think problem is with
    // This part gets the new thumbnail name
    $image_basename = $image_base[0];
    $image_ext = $image_base[1];

    $thumb_name = $image_basename.’-th.’.$image_ext;

  6. May 20th, 2005

    Sasha

    Generated file is too big.

    Better to use -thumbnail like this:

    $make_magick = exec(“convert -thumbnail $new_img_width x $new_img_height $current_file $thumb_name”, $retval);

  7. Nov 16th, 2005

    Ahsan

    I am using ur code on windows xp and it works fine if i put “dir” in the system command but when i write the convert command it doesn’t do anything. I tried the command in cmd in the same folder and it works great but not when executed from the php file. Please tell were am i going wrong?

  8. Feb 28th, 2006

    Kristin

    When I run the file… it gets all the way to “Thumbnail Created” but shows an x’d out image… and when i check the directory the file isn’t actually created… any ideas?

  9. Apr 5th, 2007

    freestream

    Well you can do it like that, but if you ever what it to work you might want to test this insted:

  10. Apr 5th, 2007

    freestream

    // Specify your file details
    $current_file = “P1010204.JPG”;
    $max_width = “150”;

    // Get the current info on the file
    $current_size = getimagesize($current_file);
    $current_img_width = $current_size[0];
    $current_img_height = $current_size[1];
    $image_base = explode(“.”, $current_file);

    // This part gets the new thumbnail name
    $image_basename = $image_base[0];
    $image_ext = $image_base[1];
    $thumb_name = $image_basename.”-th.”.$image_ext;

    // Determine if the image actually needs to be resized
    // and if it does, get the new height for it
    if ($current_img_width > $max_width)
    {
    $too_big_diff_ratio = $current_img_width/$max_width;
    $new_img_width = $max_width;
    $new_img_height = round($current_img_height/$too_big_diff_ratio);

    // Convert the file
    $make_magick = system(“convert -geometry ” . $new_img_width . “x” . $new_img_height . ” ” . $current_file . ” ” . $thumb_name, $retval);

    // Did it work?
    if (!($retval))
    {
    echo “Thumbnail created: “;
    }
    else
    {
    echo “Error: Please try again.”;
    }
    }
    else
    {
    echo “No need to resize.”; }

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