PHP gd library watermark class refactored after 7 years to support php7

<?php
/**
 * 缩略图水印生成类 文字水印 字符编码为 utf-8 
 * 中文需要处理还字体的问题
 * @name    MakeMiniature
 * @see  
 * @version	2.1.0 (2016-1-22)
 * @author	sanshi0815
 */
class MakeMiniature
{
	//字体带目录
	private $font;
	//水印内容 可以是 文字，可以是图片路径，也可以为为空
	private $watermark;
	//源文件
	private $srcFile;
	//目标文件
	private $dstFile;
	//水印类别 0 无水印，1图片水印，2文字水印
	private $watetType;
	//支持的图片类别当前支持2种
	private $imgType=array("jpg","jpeg","png");
	//图片打开资源句柄
	private $im;
	//原始图片类型
	private $fileType;
	private $errorMsg="";
	public function __construct()
	{

	}
	/**
	* 获取失败信息
	* @author  sanshi0815
	* @return  		string	失败信息
	*/
	public function getErrorMsg()
	{
		return $this->errorMsg;
	}
	/**
	* 参数设置
	* @author  sanshi0815
	* @param 		string		$font	字体文件带目录文字水印使用
	* @param 		string		$watermark	水印文字或者是图片地址
	* @param 		string		$srcFile	原始图片地址
	* @param 		string		$dstFile	生成新图片地址
	* @return  		null					无返回值
	*/
	public function set($font,$watermark,$srcFile,$dstFile)
	{
		$this->font = $font;
		$this->watermark = $watermark;
		$this->srcFile = $srcFile;
		$this->dstFile = $dstFile;
		if(empty($this->watermark ))
		{
			//无水印
			$this->watetType = 0;
		}elseif(is_file($this->watermark)){
			//图片水印
			$this->watetType = 1;
		}else{
			//文字水印
			$this->watetType = 2;
		}
	}
	/**
	* 图片资源获取 成功返回数组，失败返回false
	* @author  sanshi0815
	* @param 		string		$fileName	图片地址
	* @return  		array		r{句柄},t{后缀},w{宽度},h{高度}
	*/
	private function getResource($fileName)
	{
		if(!is_file($fileName))
		{
			$this->errorMsg = "{$fileName}  不存在 line:".__LINE__;
		}
		$temp = explode('.',$fileName);
		$fileType = strtolower(end($temp));
		//判断后缀是否是否符合要求
		if(!in_array($fileType,$this->imgType))
		{
			//文件类型不支持
			$this->errorMsg = "{$fileName}图片后缀类型不支持 line:".__LINE__;
			return false;
		}
		if($fileType=="jpg" || $fileType=="jpeg")
		{
			$im=imageCreateFromjpeg($fileName);
		}else{
			$im=imagecreatefrompng($fileName);
		}
		if(!$im)
		{
			//图片初始化失败
			$this->errorMsg = "{$fileName}图片初始化资源失败 line:".__LINE__;
			return false;
		}
		//源图片宽
		$width=imagesx($im);
		//源图片高
		$height=imagesy($im);
		if(empty($width) || empty($height))
		{
			//图片高度宽度获取失败
			$this->errorMsg = "{$fileName}图片高度或者宽度获取失败 line:".__LINE__;
			return false;
		}
		return array("r"=>$im,"t"=>$fileType,"w"=>$width,"h"=>$height);
	}
	/**
	* 原始图片全局变量设置 成功返回数组，失败返回false 
	* @author  sanshi0815
	* @return  	array		w{宽度},h{高度}
	*/
	private function initSrcImgWH()
	{
		$temp = $this->getResource($this->srcFile);
		if(empty($temp)) 
		{
			$this->errorMsg = "图像资源不存在 line:".__LINE__;
			return false;
		}
		$this->fileType = $temp['t'];
		$this->im=$temp['r'];
		return array("w"=>$temp['w'],"h"=>$temp['h']);
	}
	/**
	* 固定宽度，高度 进行图片缩放
	* @author  sanshi0815
	* @param 		int		$width	生成图片宽度
	* @param 		int		$height	生成图片高度
	* @return  	bool		成功为 true，失败为false
	*/
	public function resetImgWH($width,$height)
	{
		$temp = $this->initSrcImgWH();
		if(empty($temp))
		{
			$this->errorMsg = "图像资源不存在 line:".__LINE__;
			return false;
		}
		$srcW = $temp['w'];
		$srcH = $temp['h'];
		$detW = intval($width);
		$detH = intval($height);
		//生成新的图像资源
		$om = $this->getNewImg($srcW,$srcH,$detW,$detH);
		$temp = empty($om) ? false : $this->createImg($om,$detW,$detH);
		return $temp;
	}
	/**
	* 根据最大高度 进行图片等比缩放
	* @author  sanshi0815
	* @param 		int		$maxHeight	生成图片高度
	* @return  	bool		成功为 true，失败为false
	*/
	public function resetImgMaxH($maxHeight)
	{
		$maxHeight = intval($maxHeight);
		$temp = $this->initSrcImgWH();
		if(empty($temp))
		{
			$this->errorMsg = "图像资源不存在 line:".__LINE__;
			return false;
		}
		$srcW = $temp['w'];
		$srcH = $temp['h'];
		//计算缩放比
		$scale = round($maxHeight/$srcH,4);
		$detW = round($srcW*$scale);
		$detH = round($srcH*$scale);
		//生成新的图像资源
		$om = $this->getNewImg($srcW,$srcH,$detW,$detH);
		$temp = empty($om) ? false : $this->createImg($om,$detW,$detH);
		return $temp;

	}
	/**
	* 根据最大宽度 进行图片等比缩放
	* @author  sanshi0815
	* @param 		int		$maxWidth	生成图片宽度
	* @return  	bool		成功为 true，失败为false
	*/
	public function resetImgMaxW($maxWidth)
	{
		$temp = $this->initSrcImgWH();
		if(empty($temp))
		{
			$this->errorMsg = "图像资源不存在 line:".__LINE__;
			return false;
		}
		$srcW = $temp['w'];
		$srcH = $temp['h'];
		//计算缩放比
		$scale = round($maxWidth/$srcW,4);
		$detW = round($srcW*$scale);
		$detH = round($srcH*$scale);
		//生成新的图像资源
		$om = $this->getNewImg($srcW,$srcH,$detW,$detH);
		//$om = $this->im;
		$temp = empty($om) ? false : $this->createImg($om,$detW,$detH);
		return $temp;

	}
	/**
	* 获得缩放后的图片资源句柄
	* @author  sanshi0815
	* @param 		int		$srcW	原始图片宽度
	* @param 		int		$srcH	原始图片高度
	* @param 		int		$detW	原始图片宽度
	* @param 		int		$detH	原始图片高度
	* @return  	bool		成功为 true，失败为false
	*/
	private function getNewImg($srcW,$srcH,$detW,$detH)
	{
		$om=imagecreatetruecolor($detW,$detH);//真色彩对gb库有要求
		if(empty($om))
		{
			$this->errorMsg = "imagecreatetruecolor 函数失败 line:".__LINE__;
			return false;
		}
		//ImageCopyResized($om,$im,0,0,0,0,$detW,$detH,$srcW,$srcH);
		$temp = imagecopyresampled($om,$this->im,0,0,0,0,$detW,$detH,$srcW,$srcH);
		if(empty($temp))
		{
			$this->errorMsg = "imagecopyresampled 函数失败 line:".__LINE__;
			return false;
		}
		return $om;
	}
	/**
	* 获得图片加文字水印后资源
	* @author  sanshi0815
	* @param 		resource		$im  	原始资源
	* @param 		int		$detW	原始图片宽度
	* @param 		int		$detH	原始图片高度
	* @return  	resource		成功为 水印后的图片资源，失败为false
	*/
	private function getWatermarkText($im,$detW,$detH)
	{
		if(!$is_file($this->font))
		{
			$this->errorMsg = "{$this->font} 字体不存在 line:".__LINE__;
			return false;
		}
		//旋转角度
		$angle = 20; 
		$width = $detW/10;
		$size =  $detW/8;
		$height = $detH;
		//echo $height;
		$black = imagecolorallocate($im, 0, 0, 0);
		$grey = imagecolorallocate($im, 180, 180, 180);
		//生成水印次数
		$formax = 3;
		for($i=$formax;$i>=1;$i--)
		{
			$height =$height-$detH/($formax+2);
			//echo $height."<br/>";
			$temp = imagettftext($im, $size, $angle,$width,$height, $grey, $this->font,$this->watermark);
			if(empty($temp))
			{
				$this->errorMsg = "imagettftext 函数失败 line:".__LINE__;
				return false;
			}
		}
		return $im;
	}
	/**
	* 获得图片加图片水印后资源
	* @author  sanshi0815
	* @param 		resource		$im  	原始资源
	* @param 		int		$detW	原始图片宽度
	* @param 		int		$detH	原始图片高度
	* @return  	resource		成功为 水印后的图片资源，失败为false
	*/
	private function getWatermarkPic($im,$detW,$detH)
	{
		$temp = $this->getResource($this->watermark);
		if(empty($temp)) return false;
		$wm = $temp['r'];
		$src_x = 0;
		$src_y =  0;
		$src_w = $temp['w'];
		$src_h = $temp['h'];
		$dst_x = $detW;
		$dst_y = $detH;
		$height = $dst_y > $src_h ? ($dst_y - $src_h)/2 :0;
		$width =  $dst_x > $src_w ? ($dst_x - $src_w)/2 : 0;
		$temp = imagealphablending($im,true);
		if(empty($temp))
		{
			$this->errorMsg = "imagealphablending 函数失败 line:".__LINE__;
			return false;
		}
		$temp = imagecopymerge($im,$wm,$width,$height,0,0,$src_w,$src_h,70);
		if(empty($temp))
		{
			$this->errorMsg = "imagecopymerge 函数失败 line:".__LINE__;
			return false;
		}
		return $im;
	}
	/**
	* 新图片生成
	* @author  sanshi0815
	* @param 		resource		$im  	原始资源
	* @param 		int		$detW	原始图片宽度
	* @param 		int		$detH	原始图片高度
	* @return  		bool		成功为true，失败为false
	*/
	private function createImg($im,$detW,$detH)
	{
		//处理水印
		if($this->watetType==2)
		{
			$om = $this->getWatermarkText($im,$detW,$detH);
		}elseif ($this->watetType==1) {
			$om = $this->getWatermarkPic($im,$detW,$detH);
		}else{
			$om = $im;
		}
		if(empty($om))
		{
			$this->errorMsg = "图片资源不存在 line:".__LINE__;
			return false;
		}
		$fileType = $this->fileType;
		if($fileType=="jpg" || $fileType=="jpeg")
		{
			$temp=imagejpeg($om,$this->dstFile);
		}else{
			$temp=imagepng($om,$this->dstFile);
		}
		return $temp;
	}
}

$file=new MakeMiniature();
$file->set("./simhei.ttf","张磊专用","1_1453362028.png","s1_1453362028.png");
$file->resetImgMaxW(800);

?>

Writing something about the watermark class a long time ago, I saw that I used to write about the watermark class. It has been too long, and some things are not easy to use, and the scene has changed, such as thumbnails. Most of them should be based on the maximum The width or height is generated instead of a fixed ratio, because the picture produced in this way has the best viewing effect and will not be deformed. Therefore, this class has been improved again. For the support of php7, the old class is actually also supported.

Previous class http://blog.csdn.net/sanshi0815/article/details/1604905

The above introduces the PHP gd library watermark class, which has been restructured after 7 years to support PHP7, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.