ImageSaver.php

<?php 
/**
*Copyright (c) 2012 amir hoseinian http://www.amirhoseinian.com
*
*Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
*The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*Example usage
*		$imageMaker = New ImageMaker();
*		$imageMaker->setImage($_FILES['image'])->setName('sample name')->setPath("\data\images\brand\\")->resize(270,'auto')->save();             
*/
class ImageSaver{

	//class properties
	protected $image;
	protected $name;
	protected $path;
	protected $imageResized;
	public $allowFileTypes = array("jpg","jpeg","gif","png");

	/**
	*@param array $image posted file like $FILE['image']
	*/
	public function setImage($image){
		$this->image = $image;
		
		if(!in_array($this->getExtension() , $this->allowFileTypes)) //check if file is an image
			throw new \Exception("FileTypeNotSupported", 1);
			
		return $this;
	}

	/**
	*@param string $name new name for image to save
	*/
	public function setName($name){
		$this->name = $name;
		return $this;
	}

	/**
	*@param string $path store image place -- example \data\images\sample\
	*@constant APPLICATION_PATH u can define your application path in a global variable or simply change this 
	* 	with somting like || c:\wamp\www\sample\public
	*/
	public function setPath($path){

		if(APPLICATION_PATH)
			$this->path = APPLICATION_PATH.$path;
		else
			$this->path = $path;

		return $this;
	}

	/**
	*@return string $ext image extension eg jpg,png
	*/
	public function getExtension(){
	    $info = pathinfo($this->image['name']);
		$ext = strtolower($info['extension']); // get the extension of the file
		return $ext;
	}

	/**
	*@return resource  open image file for resizing
	*/
	public function getImageFile(){
		switch (strtolower($this->getExtension())) {
			case 'jpg':
			case 'jpeg':
				return imagecreatefromjpeg($this->image['tmp_name']);
				break;

			case 'png':
				return imagecreatefrompng($this->image['tmp_name']);
				break;
			
			case 'gif':
				return imagecreatefromgif($this->image['tmp_name']);
				break;
			
			default:
				throw new \Exception("image type not recognized");
				break;
		}
	}

	/**
	*@param string OR int $width eg 300,250,'auto'
	*@param string OR int $height eg 300,250,'auto'
	*/
	public function resize($width, $height){

		list($imageWidth, $imageHeight, $type, $attr) = getimagesize($this->image['tmp_name']);
		list($width, $height) = $this->getBestDimensions($width, $height, $imageWidth, $imageHeight);

		$this->imageResized = imagecreatetruecolor($width, $height);
		imagecopyresampled($this->imageResized, $this->getImageFile(), 0, 0, 0, 0, $width, $height, $imageWidth, $imageHeight);

		return $this;
	}

	/**
	*@param string OR int $width eg 300,250,'auto'
	*@param string OR int $height eg 300,250,'auto'
	*@param int width of uploaded image
	*@param int height of uploaded image
	*@return array ($width, $height) optimal dimensions
	*/
	private function getBestDimensions($width, $height, $imageWidth, $imageHeight){
		if($width == 'auto' && is_numeric($height)){
			$width = round(($imageWidth * $height) / $imageHeight);
		}elseif($height == 'auto' && is_numeric($width)){
			$height = round(($imageHeight * $width) / $imageWidth);
		}
		else if(!is_numeric($height) && !is_numeric($width))
			throw new \Exception("error in d", 1);	

		return array($width,$height);
	}

	/**
	*@param int $imageQuality range between 1-100 define quality of saved image
	*/
	public function save($imageQuality=100){
			$newname = $this->name.".".$this->getExtension($this->image);
			$target = $this->path.$newname;

			if($this->imageResized){
				imagejpeg($this->imageResized, $target, $imageQuality);
				imagedestroy($this->imageResized);
				$this->imageResized = null;
			}else
    			move_uploaded_file($this->image['tmp_name'], $target);
	}
}