/*
	- File Upload
	- Allows the upload of a file with specified (or no) limitations.
	- Returns 0 on success
	- Returns 1 if overwrite is disabled and file already exists
	- Returns 2 if it does not meet any valid extensions
	- Returns 3 if a max file size is set and this file exceeds it
	- Returns 4 if width is smaller than min width or height is smaller than min height
	- Returns 5 if width is larger than max width or height is larger than max height
	- Returns 6 if an unexpected error occurred and the file couldn't be uploaded
	
	$file            - $_FILES['filename']; from a form with input type="file" and name="filename"
	$newLocation     - The directory relative to the location of this script to move the file to,
	                   directory will be created if it does not exist already.
	$newName         - The new name of the file without the extension (eg. "image")
	$validExtensions - Array containing a list of valid extensions, file will be blocked if it does
	                   not have any one of these extensions (set it to null for no limits on extensions)
	$overwrite       - Overwrite the file if it already exists in this place and as this name?
	$isImage         - If only images can be uploaded, set this to true.
	$minImgWidth     - The minimum width the image can be. Set to 0 for no minimum width.
	$minImgHeight    - The minimuim height the image can be. Set to 0 for no minimum height.
	$maxImgWidth     - The maximum width the image can be. Set to 0 for no maximum width.
	$maxImgHeight    - The maximum height the image can be. Set to 0 for no maximum height.
	$maxSize         - Max size the file can be in bytes, set to 0 for unlimited.
	*/
	public function upload($file, $newLocation, $newName, $validExtensions = null, $overwrite = true, $isImage = false, $minImgWidth = 0, $minImgHeight = 0, $maxImgWidth = 0, $maxImgHeight = 0, $maxSize = 8388608) {
		
		$fileType = pathinfo($file['name'], PATHINFO_EXTENSION);
		$targFile = $newLocation . $newName . "." . $fileType;
		
		$failed = false;
		
		if (!$overwrite && file_exists($targFile)) {
			return 1;
			$failed = true;
		}
		
		if (!$failed) {
			if ($validExtensions != null) {
				$validExt = false;
				foreach ($validExtensions as $validExtension) {
					if ($fileType == $validExtension)
						$validExt = true;
				}
				if (!$validExt) {
					return 2;
					$failed = true;
				}
			}
			
			if (!$failed) {
				if ($maxSize > 0) {
					if ($file['size'] > $maxSize) {
						return 3;
						$failed = true;
					}
				}
				
				if (!$failed) {
					if ($isImage) {
						list($width, $height) = getimagesize($file['tmp_name']);

						if ($minImgWidth > 0) {
							if ($width < $minImgWidth) {
								return 4;
								$failed = true;
							}
						}

						if ($minImgHeight > 0) {
							if (!$failed) {
								if ($height < $minImgHeight) {
									return 4;
									$failed = true;
								}
							}
						}

						if ($maxImgWidth > 0) {
							if (!$failed) {
								if ($width > $maxImgWidth) {
									return 5;
									$failed = true;
								}
							}
						}

						if ($maxImgHeight > 0) {
							if (!$failed) {
								if ($height > $maxImgHeight) {
									return 5;
									$failed = true;
								}
							}
						}
					}
					
					if (!$failed) {
						if (!file_exists($newLocation))
							mkdir($newLocation);
						
						if (move_uploaded_file($file['tmp_name'], $targFile))
							return 0;
						else
							return 6;
					}
				}
			}
		}
				
		return 0;
	}