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PHP生成图片缩略图_PHP教程

WBOY
WBOYOriginal
2016-07-13 10:27:44963Durchsuche

   PHP生成图片缩略图:

  要使用PHP生成图片缩略图,要保证你的PHP服务器安装了GD2图形库

  使用一个类生成图片的缩略图,类的源码见下文

  调用此类的方法:

  resizeimage = new resizeimage("图片源文件地址", "200", "100", "0","缩略图地址");

  //就只用上面的一句话,就能生成缩略图,其中,源文件和缩略图地址可以相同,200,100分别代表宽和高

  //使用如下类就可以生成图片缩略图,

  class resizeimage

  {

  //图片类型

  var type;

  //实际宽度

  var width;

  //实际高度

  var height;

  //改变后的宽度

  var resize_width;

  //改变后的高度

  var resize_height;

  //是否裁图

  var cut;

  //源图象

  var srcimg;

  //目标图象地址

  var dstimg;

  //临时创建的图象

  var im;

  function resizeimage(img, wid, hei,c,dstpath)

  {

  this->srcimg = img;

  this->resize_width = wid;

  this->resize_height = hei;

  this->cut = c;

  //图片的类型

  this->type = strtolower(substr(strrchr(this->srcimg,"."),1));

  //初始化图象

  this->initi_img();

  //目标图象地址

  this -> dst_img(dstpath);

  //--

  this->width = imagesx(this->im);

  this->height = imagesy(this->im);

  //生成图象

  this->newimg();

  ImageDestroy (this->im);

  }

  function newimg()

  {

  //改变后的图象的比例

  resize_ratio = (this->resize_width)/(this->resize_height);

  //实际图象的比例

  ratio = (this->width)/(this->height);

  if((this->cut)=="1")

  //裁图

  {

  if(ratio>=resize_ratio)

  //高度优先

  {

  newimg = imagecreatetruecolor(this->resize_width,this->resize_height);

  imagecopyresampled(newimg, this->im, 0, 0, 0, 0, this->resize_width,this->resize_height, ((this->height)*resize_ratio), this->height);

  ImageJpeg (newimg,this->dstimg);

  }

  if(ratio

  //宽度优先

  {

  newimg = imagecreatetruecolor(this->resize_width,this->resize_height);

  imagecopyresampled(newimg, this->im, 0, 0, 0, 0, this->resize_width, this->resize_height, this->width, ((this->width)/resize_ratio));

  ImageJpeg (newimg,this->dstimg);

  }

  }

  else

  //不裁图

  {

  if(ratio>=resize_ratio)

  {

  newimg = imagecreatetruecolor(this->resize_width,(this->resize_width)/ratio);

  imagecopyresampled(newimg, this->im, 0, 0, 0, 0, this->resize_width, (this->resize_width)/ratio, this->width, this->height);

  ImageJpeg (newimg,this->dstimg);

  }

  if(ratio

  {

  newimg = imagecreatetruecolor((this->resize_height)*ratio,this->resize_height);

  imagecopyresampled(newimg, this->im, 0, 0, 0, 0, (this->resize_height)*ratio, this->resize_height, this->width, this->height);

  ImageJpeg (newimg,this->dstimg);

  }

  }

  }

  //初始化图象

  function initi_img()

  {

  if(this->type=="jpg")

  {

  this->im = imagecreatefromjpeg(this->srcimg);

  }

  if(this->type=="gif")

  {

  this->im = imagecreatefromgif(this->srcimg);

  }

  if(this->type=="png")

  {

  this->im = imagecreatefrompng(this->srcimg);

  }

  }

  //图象目标地址

  function dst_img(dstpath)

  {

  full_length = strlen(this->srcimg);

  type_length = strlen(this->type);

  name_length = full_length-type_length;

  name = substr(this->srcimg,0,name_length-1);

  this->dstimg = dstpath;

  //echo this->dstimg;

  }

  }

  ?>

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