PHP纯代码生成WordPress文章海报图片实现分享功能

$im = imagecreatetruecolor(440, 700) or die("不能初始化新的 GD 图像流");//创建一张空白图像
$_bg_color = imagecolorallocate($im, 255,255,255); //创建颜色，返回颜色标识符 
imagefill($im, 0, 0, $_bg_color); //初始化图像背景为$_bg_color
$bg=imagecreatefromstring(file_get_contents($bigImgPath));//获取网络图片
$src_info = getimagesize($bigImgPath);	//得到图片大小
$bgsf = imagecreatetruecolor(440, 300);  //创建一个画布
imagecopyresampled($bgsf,$bg,0,0,0,0,440,300,$src_info[0],$src_info[1]);//缩放图像
imagecopymerge($im,$bgsf,0,0,0,0,440,300,100);//复制合成
$_text_color = imagecolorallocate($im, 0,0,0);//文字颜色
$fontpath='msyh.ttf';//字体文件路径
$im=textcl($im,$_text_color,$str,$fontSize,$fontpath,330,'');//处理多行文字
$im=textcl($im,$_text_color,$description,$desfontSize,$fontpath,410,'      ');
$qecode=imagecreatefromstring(file_get_contents($ewm));//获取网络图片
$ewm_info = getimagesize($ewm);	//得到图片大小
imagecopymerge($im,$qecode,10,500,0,0,$ewm_info[0],$ewm_info[1],100);//复制合成
$dateimg = imagecreatetruecolor(200, 200);  //创建一个画布
imagefill($dateimg, 0, 0, $_bg_color); //填充颜色
imagettftext($dateimg, $datefontsize, 0,0, 50, $_text_color,$fontpath,$domain);//文字转图片
imagettftext($dateimg, $desfontSize, 0,0, 90, $_text_color,$fontpath,'————————————————————————');
imagettftext($dateimg, $desfontSize, 0,20, 120, $_text_color,$fontpath,$datestr);
imagecopymerge($im,$dateimg,200,520,0,0,200,200,100);//复制合成
header("Content-type: image/png"); //以图像类型输出
imagepng($im);//展示图像
imagedestroy($im); //销毁图像，释放资源

//自动文字换行计算
function textcl($img,$_text_color,$str,$fontSize,$fontpath,$Y,$before){
	 for ($i=0;$i<mb_strlen($str);$i++) {
             $letter[] = mb_substr($str, $i, 1,'utf-8');
         } 
         $content=$before;
         foreach ($letter as $l) {
           $teststr = $content." ".$l;
           $fontBox = imagettfbbox($fontSize, 0, $fontpath, $teststr);
           if (($fontBox[2] > 400) && ($content !== "")) {
               $content .= "\n";
           }
       $content .= $l;
   }  
   imagettftext($img, $fontSize, 0, ceil((440 - $fontBox[2]) / 2), $Y, $_text_color, $fontpath, $content );
   return $img;
}