PHP生成图片缩略图_[PHP教程] 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; } } ?>
|