This tutorial will describe how to create thumbnail images on the fly using PHP while uploading a image. With uploaded of single image you can create different thumbnail with different size of same Image. Here you will Learn how to process a images and create their thumbnails.
System Requirements:
- Work for PHP only.
- GD library must be installed which you can check with phpinfo() with version of >=GD 2.0.1
- Uploading image size should be less than 2MB but if you want to increase then increase the value of "upload_max_filesize", "post_max_size" from php.ini
Code Snippets
function resize($width, $height, $imageName,$extension) {
if(empty($width) || empty($height) || empty($imageName) || empty($extension)){
die('Required parameter is missing');
}
$docRoot = getenv("DOCUMENT_ROOT");
/* Get original image x y */
$tmpNM = $_FILES['files']['tmp_name'];
list($w, $h) = getimagesize($_FILES['files']['tmp_name']);
/* calculate new image size with ratio */
$ratio = max($width / $w, $height / $h);
$h = ceil($height / $ratio);
$x = ($w - $width / $ratio) / 2;
$w = ceil($width / $ratio);
/* new file name */
$path = $docRoot . '/images/thumb/' . $imageName;
/* read binary data from image file */
$imgString = file_get_contents($_FILES['files']['tmp_name']);
/* create image from string */
$image = imagecreatefromstring($imgString);
$tmp = imagecreatetruecolor($width, $height);
imagecopyresampled($tmp, $image, 0, 0, $x, 0, $width, $height, $w, $h);
$fileTypes = array('jpg', 'jpeg', 'jpe', 'png', 'bmp', 'gif'); // File extensions
/* Save image */
switch ($extension) {
case 'jpg':
case 'jpeg':
case 'jpe':
imagejpeg($tmp, $path, 100);
break;
case 'png':
imagepng($tmp, $path,0);
break;
case 'gif':
imagegif($tmp, $path, 100);
break;
case 'bmp':
imagewbmp($tmp, $path);
break;
default:
exit;
break;
}
return $path;
/* cleanup memory */
imagedestroy($image);
imagedestroy($tmp);
}
This function is able to create multiple thumbnail with different sizes of uploaded images.How to create thumbnail of 50pxX50px image?
$w='50'; //New image width
$h='50'; //New image height
$imageName=$w.'_'.$h.'_'.$_FILES['files']['name']; //Uploaded file Name
$imageExtensionArray = explode(".", $_FILES['files']['name']);
$extension=$imageExtensionArray[1];
$this->resize($w, $h, "{$imageName}",$extension);
How to create thumbnail of 100pxX100px image?
$w='100'; //New image width
$h='100'; //New image height
$imageName=$w.'_'.$h.'_'.$_FILES['files']['name']; //Uploaded file Name
$imageExtensionArray = explode(".", $_FILES['files']['name']);
$extension=$imageExtensionArray[1];
$this->resize($w, $h, "{$imageName}",$extension);
