文字水印，支持自动换行，自动截取（包括汉字）代码,PHP代码库,德仔网

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【PHP】文字水印，支持自动换行，自动截取（包括汉字）
作者:zhouljsh / 发布于2015/11/16/ 670
首先要建立image.class.php类，这个类选自dedecms的图片水印类，但是经过改变后可实现以下几个功能： 1.在图片上自定义位置添加水印文字； 2.如果文字太长，会自动截取可写下的文字，支持汉字，英文； 3.支持utf8，gbk截取； 4.在可编辑区域支持自动换行；

	<?php
	/**
	* 图像处理类
	* @license http://www.rijigu.com
	* @link http://www.rijigu.com
	*/
	class image
	{
	 var $attachinfo;
	 var $targetfile; //图片路径
	 var $imagecreatefromfunc;
	 var $imagefunc;
	 var $attach;
	 var $animatedgif;
	 var $watermarkquality;
	 var $watermarktext;
	 var $thumbstatus;
	 var $watermarkstatus;
	
	 // 析构函数,兼容PHP4
	 function image($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach = array())
	 {
	 $this->__construct($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach);
	 }

	 // 析构函数
	 function __construct($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach = array())
	 {
	 $this->thumbstatus = $cfg_thumb;
	 $this->watermarktext = $cfg_watermarktext;
	 $this->watermarkstatus = $photo_waterpos;
	 $this->watermarkquality = $photo_marktrans;
	 $this->watermarkminwidth = $photo_wwidth;
	 $this->watermarkminheight = $photo_wheight;
	 $this->watermarktype = $cfg_watermarktype;
	 $this->watermarktrans = $photo_diaphaneity;
	 $this->animatedgif = 0;
	 $this->targetfile = $targetfile;
	 $this->attachinfo = @getimagesize($targetfile);
	 $this->attach = $attach;

	
	 switch($this->attachinfo['mime'])
	 {
	 case 'image/jpeg':
	 $this->imagecreatefromfunc = function_exists('imagecreatefromjpeg') ? 'imagecreatefromjpeg' : '';
	 $this->imagefunc = function_exists('imagejpeg') ? 'imagejpeg' : '';
	 break;
	 case 'image/gif':
	 $this->imagecreatefromfunc = function_exists('imagecreatefromgif') ? 'imagecreatefromgif' : '';
	 $this->imagefunc = function_exists('imagegif') ? 'imagegif' : '';
	 break;
	 case 'image/png':
	 $this->imagecreatefromfunc = function_exists('imagecreatefrompng') ? 'imagecreatefrompng' : '';
	 $this->imagefunc = function_exists('imagepng') ? 'imagepng' : '';
	 break;
	 }//为空则匹配类型的函数不存在

	 $this->attach['size'] = empty($this->attach['size']) ? @filesize($targetfile) : $this->attach['size'];
	 if($this->attachinfo['mime'] == 'image/gif')
	 {
	 $fp = fopen($targetfile, 'rb');
	 $targetfilecontent = fread($fp, $this->attach['size']);
	 fclose($fp);
	 $this->animatedgif = strpos($targetfilecontent, 'NETSCAPE2.0') === false ? 0 : 1;
	 }
	 }

	 /**
	 * 生成缩略图
	 *
	 * @access public
	 * @param int $thumbwidth 图片宽度
	 * @param int $thumbheight 图片高度
	 * @param int $preview 是否预览
	 * @return void
	 */
	 function thumb($thumbwidth, $thumbheight, $preview = 0)
	 {
	 $this->thumb_gd($thumbwidth, $thumbheight, $preview);

	 if($this->thumbstatus == 2 && $this->watermarkstatus)
	 {
	 $this->image($this->targetfile, $this->attach);
	 $this->attach['size'] = filesize($this->targetfile);
	 }
	 }

	 /**
	 * 图片水印
	 *
	 * @access public
	 * @param int $preview 是否预览
	 * @return void
	 */
	 function watermark($preview = 0)
	 {
	 if($this->watermarkminwidth && $this->attachinfo[0] <= $this->watermarkminwidth && $this->watermarkminheight && $this->attachinfo[1] <= $this->watermarkminheight)
	 {
	 return ;
	 }
	 $this->watermark_gd($preview);
	 }

	 /**
	 * 使用gd生成缩略图
	 *
	 * @access public
	 * @param int $thumbwidth 图片宽度
	 * @param int $thumbheight 图片高度
	 * @param int $preview 是否预览
	 * @return void
	 */
	 function thumb_gd($thumbwidth, $thumbheight, $preview = 0)
	 {

	 if($this->thumbstatus && function_exists('imagecreatetruecolor') && function_exists('imagecopyresampled') && function_exists('imagejpeg'))
	 {
	 $imagecreatefromfunc = $this->imagecreatefromfunc;
	 $imagefunc = $this->thumbstatus == 1 ? 'imagejpeg' : $this->imagefunc;
	 list($imagewidth, $imageheight) = $this->attachinfo;
	 if(!$this->animatedgif && ($imagewidth >= $thumbwidth || $imageheight >= $thumbheight))
	 {
	 $attach_photo = $imagecreatefromfunc($this->targetfile);
	 $x_ratio = $thumbwidth / $imagewidth;
	 $y_ratio = $thumbheight / $imageheight;
	 if(($x_ratio * $imageheight) < $thumbheight)
	 {
	 $thumb['height'] = ceil($x_ratio * $imageheight);
	 $thumb['width'] = $thumbwidth;
	 }
	 else
	 {
	 $thumb['width'] = ceil($y_ratio * $imagewidth);
	 $thumb['height'] = $thumbheight;
	 }
	 $targetfile = !$preview ? ($this->thumbstatus == 1 ? $this->targetfile.'.thumb.jpg' : $this->targetfile) : './watermark_tmp.jpg';
	 $thumb_photo = imagecreatetruecolor($thumb['width'], $thumb['height']);
	 imagecopyresampled($thumb_photo, $attach_photo, 0, 0, 0, 0, $thumb['width'], $thumb['height'], $imagewidth, $imageheight);
	 if($this->attachinfo['mime'] == 'image/jpeg')
	 {
	 $imagefunc($thumb_photo, $targetfile, 100);
	 }
	 else
	 {
	 $imagefunc($thumb_photo, $targetfile);
	 }
	 $this->attach['thumb'] = $this->thumbstatus == 1 ? 1 : 0;
	 }
	 }
	 }
	
	/* 返回一个字符的数组 */
	function chararray($str,$charset="utf-8"){
	 $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
	 $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
	 $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
	 $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
	 preg_match_all($re[$charset], $str, $match);
	 return $match;
	}
	
	/* 返回一个字符串在图片中所占的宽度 */
	function charwidth($fontsize,$fontangle,$ttfpath,$char){
	 $box = @imagettfbbox($fontsize,$fontangle,$ttfpath,$char);
	 $width = max($box[2], $box[4]) - min($box[0], $box[6]);
	 return $width;
	}
	
	 /**
	 * 使用gd进行水印
	 *
	 * @access public
	 * @param int $preview 是否预览
	 * @return void
	 */
	 function watermark_gd($preview = 0)
	 {
	 if($this->watermarkstatus && function_exists('imagecopy') && function_exists('imagealphablending') && function_exists('imagecopymerge'))
	 {
	 $imagecreatefunc = $this->imagecreatefromfunc;
	 $imagefunc = $this->imagefunc;
	 list($imagewidth, $imageheight) = $this->attachinfo;
	 if($this->watermarktype < 2)
	 {
	 $watermark_file = $this->watermarktype == 1 ? DEDEDATA.'/mark/mark.png' : DEDEDATA.'/mark/mark.gif';
	 $watermarkinfo = @getimagesize($watermark_file);
	 $watermark_logo = $this->watermarktype == 1 ? @imagecreatefrompng($watermark_file) : @imagecreatefromgif($watermark_file);
	 if(!$watermark_logo)
	 {
	 return ;
	 }
	 list($logowidth, $logoheight) = $watermarkinfo;
	 }
	 else
	 {
	 $box = @imagettfbbox($this->watermarktext['size'], $this->watermarktext['angle'], $this->watermarktext['fontpath'],$this->watermarktext['text']);
	 $logowidth = max($box[2], $box[4]) - min($box[0], $box[6]);
	 $logoheight = max($box[1], $box[3]) - min($box[5], $box[7]);
	 $ax = min($box[0], $box[6]) * -1;
	 $ay = min($box[5], $box[7]) * -1;
	 }
	
	
	 $imgMaxWidth = $this->watermarktext['imgMaxWidth'];
	 $imgMaxHeight = $this->watermarktext['imgMaxHeight'];
	 $base_x = $this->watermarktext['base_x']+$ax;
	 $base_y = $this->watermarktext['base_y']+$ay;
	 $actRows = floor($imgMaxHeight/$logoheight);//实际可使用的行数
	 $actwidth = $imgMaxWidth*$actRows;//实际可用的字符串宽度
	 $chararray = $this -> chararray($this->watermarktext['text']);
	 $textarray = array();
	 $width = 0;
	 $rowwidth = 0;
	 $rowstring = '';
	 $i = 0;
	 foreach($chararray[0] as $key => $val){
	 $temp_width = $this -> charwidth($this->watermarktext['size'], $this->watermarktext['angle'], $this->watermarktext['fontpath'],$val)+$this->watermarktext['extend_len'];
	 if($width+$temp_width>$actwidth){
	 $textarray[$i]['text'] = $rowstring;
	 $textarray[$i]['x'] = $base_x;
	 $textarray[$i]['y'] = $base_y+$i*$logoheight;
	 break;
	 }
	 $width += $temp_width;
	 if($key == (count($chararray[0])-1)){
	 $rowwidth += $temp_width;
	 $rowstring .= $val;
	 }
	 if($rowwidth+$temp_width>$imgMaxWidth || $key == (count($chararray[0])-1)){
	 $textarray[$i]['text'] = $rowstring;
	 $textarray[$i]['x'] = $base_x;
	 $textarray[$i]['y'] = $base_y+$i*$logoheight;
	 $rowwidth = 0;
	 $rowstring = '';
	 $i = $i + 1;
	 }
	 $rowwidth += $temp_width;
	 $rowstring .= $val;
	 }
	 $wmwidth = $imagewidth - $imgMaxWidth;
	 $wmheight = $imageheight - $imgMaxHeight;

	 if(($this->watermarktype < 2 && is_readable($watermark_file) || $this->watermarktype == 2) && $wmwidth > 10 && $wmheight > 10 && !$this->animatedgif)
	 {
	 switch($this->watermarkstatus)
	 {
	 case 1:

	 $x = +5;
	 $y = +5;
	 break;
	 case 2:
	 $x = ($imagewidth - $logowidth) / 2;
	 $y = +5;
	 break;
	 case 3:
	 $x = $imagewidth - $logowidth - 5;
	 $y = +5;
	 break;
	 case 4:
	 $x = +5;
	 $y = ($imageheight - $logoheight) / 2;
	 break;
	 case 5:
	 $x = ($imagewidth - $logowidth) / 2;
	 $y = ($imageheight - $logoheight) / 2;
	 break;
	 case 6:
	 $x = $imagewidth - $logowidth - 5;
	 $y = ($imageheight - $logoheight) / 2;
	 break;
	 case 7:
	 $x = +5;
	 $y = $imageheight - $logoheight - 5;
	 break;
	 case 8:
	 $x = ($imagewidth - $logowidth) / 2;
	 $y = $imageheight - $logoheight - 5;
	 break;
	 case 9:
	 $x = $imagewidth - $logowidth - 5;
	 $y = $imageheight - $logoheight -5;
	 break;
	 case 10:
	 break;
	 }
	 $dst_photo = @imagecreatetruecolor($imagewidth, $imageheight);
	 $target_photo = $imagecreatefunc($this->targetfile);
	 imagecopy($dst_photo, $target_photo, 0, 0, 0, 0, $imagewidth, $imageheight);
	 if($this->watermarktype == 1)
	 {
	 imagecopy($dst_photo, $watermark_logo, $x, $y, 0, 0, $logowidth, $logoheight);
	 }
	 elseif($this->watermarktype == 2)
	 {
	 if(($this->watermarktext['shadowx'] || $this->watermarktext['shadowy']) && $this->watermarktext['shadowcolor'])
	 {
	 $shadowcolorrgb = explode(',', $this->watermarktext['shadowcolor']);
	 $shadowcolor = imagecolorallocate($dst_photo, $shadowcolorrgb[0], $shadowcolorrgb[1], $shadowcolorrgb[2]);
	 imagettftext($dst_photo, $this->watermarktext['size'], $this->watermarktext['angle'],
	 $x + $ax + $this->watermarktext['shadowx'], $y + $ay + $this->watermarktext['shadowy'], $shadowcolor,
	 $this->watermarktext['fontpath'], $this->watermarktext['text']);
	 }
	 $colorrgb = explode(',', $this->watermarktext['color']);
	 $color = imagecolorallocate($dst_photo, $colorrgb[0], $colorrgb[1], $colorrgb[2]);
	 foreach($textarray as $val){
	 imagettftext($dst_photo, $this->watermarktext['size'], $this->watermarktext['angle'],
	 $val['x'], $val['y'], $color, $this->watermarktext['fontpath'], $val['text']);
	 }
	 //imagettftext($dst_photo, $this->watermarktext['size'], $this->watermarktext['angle'],
	 //$x + $ax, $y + $ay, $color, $this->watermarktext['fontpath'], $this->watermarktext['text']);
	 }
	 else
	 {
	 imagealphablending($watermark_logo, true);
	 imagecopymerge($dst_photo, $watermark_logo, $x, $y, 0, 0, $logowidth, $logoheight, $this->watermarktrans);
	 }
	 $targetfile = !$preview ? $this->targetfile : './watermark_tmp.jpg';
	 if($this->attachinfo['mime'] == 'image/jpeg')
	 {
	 $imagefunc($dst_photo, $targetfile, $this->watermarkquality);
	 }
	 else
	 {
	 $imagefunc($dst_photo, $targetfile);
	 }
	 $this->attach['size'] = filesize($this->targetfile);
	 }
	 }
	 }
	}//End Class
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