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<?php
if(isset($_POST['submit'])){
 require 'class.imageupload.php';
 
 //$image = new ImageUloader($max_size, $max_width, $max_height, $upload_dir)
 $image = new ImageUploader(26, 200, 150, 'images/avatar/'); //1. maximum image size in kb(kilo byte), 2. maximum image width
 //3. maximum image height, 4. upload dir
 
 $image->setImage('input_field_name'); //name of your input image field name
 
 if(!$image->checkSize()) //check image size
 $errors[] = "File size is Big";
 
 if(!$image->checkHeight()) //check image height
 $errors[] = "File height is Big";
 
 if(!$image->checkWidth()) //check image width
 $errors[] = "File width is Big";
 
 if(!$image->checkExt()) //check image extension
 $errors[] = "File ext is not supported";
 
 if(!isset($errors)){
 $image->setImageName($userid); //set image name
 $image->deleteExisting();
 $image->upload();
 
 echo "<h2>Avatar Changed Successfully</h2>";
 }
 else{
 echo "<h2>You must correct the errors to proceed</h2><br>";
 print_r($errors);
 }
 }
 ?>
 
 <form enctype="multipart/form-data" action="" method="POST">
 <input name="input_field_name" type="file" />
 <input type="submit" name="submit" value="Change Avatar" />
 </form>
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