How to Require a Minimum Image Dimension for Uploading?

2 comments

1. Add this code to your theme’s functions.php file, and it will limit minimum image dimentions

   add_filter('wp_handle_upload_prefilter','tc_handle_upload_prefilter');
   function tc_handle_upload_prefilter($file)
   {
   
       $img=getimagesize($file['tmp_name']);
       $minimum = array('width' => '640', 'height' => '480');
       $width= $img[0];
       $height =$img[1];
   
       if ($width < $minimum['width'] )
           return array("error"=>"Image dimensions are too small. Minimum width is {$minimum['width']}px. Uploaded image width is $width px");
   
       elseif ($height <  $minimum['height'])
           return array("error"=>"Image dimensions are too small. Minimum height is {$minimum['height']}px. Uploaded image height is $height px");
       else
           return $file; 
   }
   

   Then just change the numbers of the minimum dimensions you want (in my example is 640 and 480)

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2. I prefer not to reformat a colleague’s code.
   So, this is almost the same answer as @MaorBarazany’s, but checking the mime type, changing the file['error'] declaration and changing the function namespace to this wpse Question ID.

   Also, the check only occurs for users that are not administrators.

   add_action( 'admin_init', 'wpse_28359_block_authors_from_uploading_small_images' );
   
   function wpse_28359_block_authors_from_uploading_small_images()
   {
       if( !current_user_can( 'administrator') )
           add_filter( 'wp_handle_upload_prefilter', 'wpse_28359_block_small_images_upload' ); 
   }
   
   function wpse_28359_block_small_images_upload( $file )
   {
       // Mime type with dimensions, check to exit earlier
       $mimes = array( 'image/jpeg', 'image/png', 'image/gif' );
   
       if( !in_array( $file['type'], $mimes ) )
           return $file;
   
       $img = getimagesize( $file['tmp_name'] );
       $minimum = array( 'width' => 640, 'height' => 480 );
   
       if ( $img[0] < $minimum['width'] )
           $file['error'] = 
               'Image too small. Minimum width is ' 
               . $minimum['width'] 
               . 'px. Uploaded image width is ' 
               . $img[0] . 'px';
   
       elseif ( $img[1] < $minimum['height'] )
           $file['error'] = 
               'Image too small. Minimum height is ' 
               . $minimum['height'] 
               . 'px. Uploaded image height is ' 
               . $img[1] . 'px';
   
       return $file;
   }
   

   Result of the hook:

   

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