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PHP Create thumbnail of an image

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PHP Script to create thumbnail of any image (.jpg, .png and .gif). This create thumbnail function is ready to use. Just provide desired parameters and it will do the magic. It uses GD library for thumbnail generation.


Title: Create thumbnail of an image in PHP

PHP SCRIPT to create thumbnail of any image. This works for .jpg, .gif and .png files as well. 

$source  parameter expects path & file name of original image
$thumbnail_path  expects the path & file name where thumbnail is to be stored
$thumbnail_width is the width of the resulting thumbnail
$thumbnail_height is the height of the thumbnail

function createImageThumbnail($source, $thumbnail_path, $thumbnail_width, $thumbnail_height, $background=false) {
	// Get dimensions of original image
    list($image_width, $imagel_height, $original_type) = getimagesize($source);
	// Set dimensions of the thumbnail
    if ($image_width > $imagel_height) {
        $new_width = $thumbnail_width;
        $new_height = intval($imagel_height * $new_width / $image_width);
    } else {
        $new_height = $thumbnail_height;
        $new_width = intval($image_width * $new_height / $imagel_height);
    $dest_x = intval(($thumbnail_width - $new_width) / 2);
    $dest_y = intval(($thumbnail_height - $new_height) / 2);

// Depending on the fact if original image is GIF, JPEG or PNG, we use respective GD functions
    if ($original_type === 1) {
        $imgt = "ImageGIF";
        $imgcreatefrom = "ImageCreateFromGIF";
    } else if ($original_type === 2) {
        $imgt = "ImageJPEG";
        $imgcreatefrom = "ImageCreateFromJPEG";
    } else if ($original_type === 3) {
        $imgt = "ImagePNG";
        $imgcreatefrom = "ImageCreateFromPNG";
    } else {
        return false;

// Load the original image
    $old_image = $imgcreatefrom($source);
    $new_image = imagecreatetruecolor($thumbnail_width, $thumbnail_height); // creates new image, but with a black background

    // If background color parameter is provided, then use it
    if(is_array($background) && count($background) === 3) {
      list($red, $green, $blue) = $background;
      $color = imagecolorallocate($new_image, $red, $green, $blue);
      imagefill($new_image, 0, 0, $color);
    // For PNG files use, we make their backgroung transparent
    } else if($background === 'transparent' && $original_type === 3) {
      imagesavealpha($new_image, TRUE);
      $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
      imagefill($new_image, 0, 0, $color);

// Create final thumbnail image.
    imagecopyresampled($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $image_width, $imagel_height);
    $imgt($new_image, $thumbnail_path);
    return file_exists($thumbnail_path);
}  // End of Create thumbnail of an image function 

// This is path of the image file for which thumbnail is to be generated
// Make sure image one.jpg exists in folder image. 
// Folder named thumb should exist. Because thumbnail image will be stored here

// Set height and width of the thumbnail

// Call the function with the above paraters. It will just create an thumbnail and on success return and echo 1.
echo createImageThumbnail($source, $destination, $thumbnail_width, $thumbnail_height);


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