首页 / 网页编程 / PHP / 基于GD2图形库的PHP生成图片缩略图类代码分享

$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, <?phpclass 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<$resize_ratio）//宽度优先{$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<$resize_ratio）{$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;}}?>