function file_validate_image_resolution

file_validate_image_resolution(stdClass $file, $maximum_dimensions = 0, $minimum_dimensions = 0)

Verifies that image dimensions are within the specified maximum and minimum.

Non-image files will be ignored. If an image toolkit is available the image will be scaled to fit within the desired maximum dimensions.

Parameters

$file: A Drupal file object. This function may resize the file affecting its size.

$maximum_dimensions: An optional string in the form WIDTHxHEIGHT e.g. '640x480' or '85x85'. If an image toolkit is installed the image will be resized down to these dimensions. A value of 0 indicates no restriction on size, so resizing will be attempted.

$minimum_dimensions: An optional string in the form WIDTHxHEIGHT. This will check that the image meets a minimum size. A value of 0 indicates no restriction.

Return value

An array. If the file is an image and did not meet the requirements, it will contain an error message.

See also

hook_file_validate()

Related topics

File

includes/file.inc, line 1809

API for handling file uploads and server file management.

Code

function file_validate_image_resolution(stdClass $file, $maximum_dimensions = 0, $minimum_dimensions = 0) {
  $errors = array();

  // Check first that the file is an image.
  if ($info = image_get_info($file->uri)) {
    if ($maximum_dimensions) {
      // Check that it is smaller than the given dimensions.
      list($width, $height) = explode('x', $maximum_dimensions);
      if ($info['width'] > $width || $info['height'] > $height) {
        // Try to resize the image to fit the dimensions.
        if ($image = image_load($file->uri)) {
          image_scale($image, $width, $height);
          image_save($image);
          $file->filesize = $image->info['file_size'];
          drupal_set_message(t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels.', array('%dimensions' => $maximum_dimensions)));
        }
        else {
          $errors[] = t('The image is too large; the maximum dimensions are %dimensions pixels.', array('%dimensions' => $maximum_dimensions));
        }
      }
    }

    if ($minimum_dimensions) {
      // Check that it is larger than the given dimensions.
      list($width, $height) = explode('x', $minimum_dimensions);
      if ($info['width'] < $width || $info['height'] < $height) {
        $errors[] = t('The image is too small; the minimum dimensions are %dimensions pixels.', array('%dimensions' => $minimum_dimensions));
      }
    }
  }

  return $errors;
}