图像助手类-KeepStudy

图像助手类

```php
<?php
/**
 * 图像助手类
 * @author : weiyi <294287600@qq.com>
 * Licensed ( http://www.wycto.com )
 * Copyright (c) 2016~2099 http://www.wycto.com All rights reserved.
 * time 2017-01-17
 */
namespace wycto\helper;

class HelperImg
{

/**
	 *
	 * @param unknown_type $srcImg 原图片
	 * @param unknown_type $waterImg 水印图片
	 * @param unknown_type $savepath 保存路径
	 * @param unknown_type $savename 保存名字
	 * @param unknown_type $positon 水印位置 1:顶部居左, 2:顶部居右, 3:居中, 4:底部局左, 5:底部居右
	 * @param unknown_type $alpha 透明度 -- 0:完全透明, 100:完全不透明
	 * @return number|string
	 * 			成功 -- 加水印后的新图片地址
	 *          失败 -- -1:原文件不存在, -2:水印图片不存在, -3:原文件图像对象建立失败
	 *          -4:水印文件图像对象建立失败 -5:加水印后的新图片保存失败
	 */
	static function water_img($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=50)
	{
		$temp = pathinfo($srcImg);
		$name = $temp['basename'];
		$path = $temp['dirname'];
		$exte = $temp['extension'];
		$savename = $savename ? $savename : $name;
		$savepath = $savepath ? $savepath : $path;
		$savefile = $savepath .'/'. $savename;
		$srcinfo = @getimagesize($srcImg);
		if (!$srcinfo) {
			return -1; //原文件不存在
		}
		$waterinfo = @getimagesize($waterImg);
		if (!$waterinfo) {
			return -2; //水印图片不存在
		}
		$srcImgObj = imagecreatefromstring(file_get_contents($srcImg));
		//$srcImgObj = $this->image_create_from_ext($srcImg);
		if (!$srcImgObj) {
			return -3; //原文件图像对象建立失败
		}
		$waterImgObj = imagecreatefromstring(file_get_contents($waterImg));
		//$waterImgObj = $this->image_create_from_ext($waterImg);
		if (!$waterImgObj) {
			return -4; //水印文件图像对象建立失败
		}
		switch ($positon) {
			//1顶部居左
			case 1: $x=$y=0; break;
			//2顶部居右
			case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break;
			//3居中
			case 3: $x = ($srcinfo[0]-$waterinfo[0])/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break;
			//4底部居左
			case 4: $x = 0; $y = $srcinfo[1]-$waterinfo[1]; break;
			//5底部居右
			case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break;
			default: $x=$y=0;
		}
		imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha);
		switch ($srcinfo[2]) {//1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM。
			case 1: imagegif($srcImgObj, $savefile); break;
			case 2: imagejpeg($srcImgObj, $savefile); break;
			case 3: imagepng($srcImgObj, $savefile); break;
			default: return -5; //保存失败
		}
		imagedestroy($srcImgObj);
		imagedestroy($waterImgObj);
		return $savefile;
	}
}
```

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