【个人意见,仅供参考】建议养成google的习惯:1.一个老外写的PHP图片类,有源码和说明
http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php2.另一个老外写的“Image Uploading and Resizing with PHP”,即“PHP图片上传和大小调整”
http://www.4wordsystems.com/php_image_resize.php
http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php2.另一个老外写的“Image Uploading and Resizing with PHP”,即“PHP图片上传和大小调整”
http://www.4wordsystems.com/php_image_resize.php
可以不生成图片文件,把你上面的程序,保存为xx.php.然后呢,将原始图片名和要生成的文件宽度和高度当做参数传给xx.php在页面可以这样调用xx.php?file=xx.jpg&width=200&height=200
xx.php动态获得这三个参数,然后动态生成.
这个类的使用方法getpic($rs["filetype"],$rs["picpath"],30,20,"cba",$thumb_path)
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[separator]
var $dstimg;
//临时创建的图象
var $im;
//缩略图目录
var $th_path;function resizeimage($img, $wid, $hei,$c,$type="s",$qianzhui)
{
$this->srcimg = $img;
$this->resize_width = $wid;
$this->resize_height = $hei;
$this->cut = $c;
$this->th_path = $qianzhui;
//图片的类型
$this->type = substr(strrchr($this->srcimg,"."),1);
//初始化图象
$this->initi_img();
//目标图象地址
$this -> dst_img($type);
//--
$this->width = imagesx($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($type)
{
$name = $this->srcimg;
$n=substr(strrchr($name,"/"),1);
$this->dstimg = $this->th_path.$n.".".$type.".".$this->type;
}
}///获取文件名
//获取新图片地质
function getpic($filetype,$attachment,$w,$h,$type="s",$t_path=""){
$qianzhui=$t_path;
$a=substr(strrchr($attachment,"/"),1);
//获取文件名'image/jpg', 'image/jpeg', 'image/png', 'image/pjpeg', 'image/gif', 'image/bmp'
if($filetype=="image/pjpeg" || $filetype=="image/jpeg" || $filetype=="image/jpg" ){$img_end_src=$qianzhui.$a.".".$type.".jpg";}elseif($filetype=="image/gif"){
$img_end_src=$qianzhui.$a.".".$type.".gif";
}
elseif($filetype=="image/x-png"){
$img_end_src=$qianzhui.$a.".".$type.".png";
}
else
{
$img_end_src=$qianzhui.$a;
}//
//判断是不是存在
$img_src=$qianzhui.$attachment;//
if(file_exists($img_end_src)){
$resizeimage=$img_end_src;
}
else
{
$resizeimage =new resizeimage($attachment,$w,$h,"1",$type,$qianzhui);
$resizeimage =$img_end_src;}return $resizeimage;
}