PHP简单图片处理类封装实现

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项目链接：http://www.yusian.com/thread-11071-1-1.html

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<?php
	class Image{
		private $path;
		// 构造方法，给定图片所在的目录
		public function __construct($path){
			$this->path = $path;
		}
		
		// 1、创建缩略图
		public function thumb($filename, $w, $h, $prefix){
			$file = $this->path."/".$filename;
			list($width, $height, $type) = getimagesize($file);
			// 修正比例
			$p = 1;
			if ($width > $height){
				$p = $w / $width;
				$h = $p * $height;
			}else{
				$p = $h / $height;
				$w = $p * $width;
			}
		    // 创建图片资源和新图的图片资源
		    $image = $this->get_image_source($file);
		    $image_new = imagecreatetruecolor($w, $h);
		    // 将原图的指定区域绘制到新图的指定区域即可
		    imagecopyresampled($image_new, $image, 0, 0, 0, 0, $w, $h, $width, $height);
		    // 输出图片并释放资源
		    $save_image_method = "image".$this->file_type($file);
		    $save_image_method($image_new, $this->path."/".$prefix.$filename);
		    imagedestroy($image);
		}
		
		// 2、增加图片水印
		public function water_mark($filename, $string, $position, $save_name){
			$file = $this->path."/".$filename;
			list($width, $height, $type) = getimagesize($file);
			$image = $this->get_image_source($file);
			$color = imagecolorallocate($image, 128, 128, 128);
			$font = 5;
			$w = imagefontwidth($font) * strlen($string);
			$h = imagefontheight($font);
			$x = 10;
			$y = 10;
			switch($position){
				case 1:{$x = 10; $y = 10;}break;
				case 4:{$x = 10; $y = ($height - $h)*0.5;}break;
				case 7:{$x = 10; $y = ($height - $h) - 10;}break;
				
				case 2:{$x = ($width - $w)*0.5; $y = 10;}break;
				case 5:{$x = ($width - $w)*0.5; $y = ($height - $h)*0.5;}break;
				case 8:{$x = ($width - $w)*0.5; $y = ($height - $h) - 10;}break;
				
				case  3:{$x = ($width - $w) - 10; $y = 10;}break;
				case  6:{$x = ($width - $w) - 10; $y = ($height - $h)*0.5;}break;
				default:{$x = ($width - $w) - 10; $y = ($height - $h) - 10;}break;
			}
			imagestring($image, $font, $x, $y, $string, $color);
		    // 输出图片并释放资源
		    $save_image_method = "image".$this->file_type($file);
		    $new_filename = strlen($save_name) ? $save_name : $filename;
		    $save_image_method($image, $this->path."/".$new_filename);
		    imagedestroy($image);
		}
		
		// 3、使用unlink函数删除图片
		public function delete_image($filename){
			$file_path = $this->path."/".$filename;
			$thumb_path = $this->path."/thumb_".$filename;
			if(file_exists($file_path) && $filename)unlink($file_path);
			if(file_exists($thumb_path) && $filename)unlink($thumb_path);
		}
		
		/****************私有方法******************/
		// 获取图片文件类型
		private function file_type($file){
			list($width, $height, $type) = getimagesize($file);
		    $type_array = array(1=>"gif", 2=>"jpeg", 3=>"png");
		    return $type_array[$type];
		}
		// 创建图片文件资源
		private function get_image_source($file){
		    $createimage = "imagecreatefrom".$this->file_type($file);
		    return $createimage($file);
		}
	}