/**
* Validation rule to test if an upload is an image and, optionally, is the correct size.
*
* // The "image" file must be an image
* $array->rule('image', 'Upload::image')
*
* // The "photo" file has a maximum size of 640x480 pixels
* $array->rule('photo', 'Upload::image', array(':value', 640, 480));
*
* // The "image" file must be exactly 100x100 pixels
* $array->rule('image', 'Upload::image', array(':value', 100, 100, TRUE));
*
*
* @param array $file $_FILES item
* @param integer $max_width maximum width of image
* @param integer $max_height maximum height of image
* @param boolean $exact match width and height exactly?
* @return boolean
*/
public static function image(array $file, $max_width = NULL, $max_height = NULL, $exact = FALSE)
{
if (Upload::not_empty($file)) {
try {
// Get the width and height from the uploaded image
list($width, $height) = getimagesize($file['tmp_name']);
} catch (ErrorException $e) {
// Ignore read errors
}
if (empty($width) or empty($height)) {
// Cannot get image size, cannot validate
return FALSE;
}
if (!$max_width) {
// No limit, use the image width
$max_width = $width;
}
if (!$max_height) {
// No limit, use the image height
$max_height = $height;
}
if ($exact) {
// Check if dimensions match exactly
return $width === $max_width and $height === $max_height;
} else {
// Check if size is within maximum dimensions
return $width <= $max_width and $height <= $max_height;
}
}
return FALSE;
}
public function uploaded($name)
{
return isset($_FILES[$name]) and Upload::not_empty($_FILES[$name]) and Upload::valid($_FILES[$name]);
}