PHP生成缩略图/截取小图
[ 2010-09-05 22:54:20 | 作者: admin ]
<?
/***************************************/
/*功 能:利用PHP的GD库生成高质量的缩略图*/
/*运行环境:PHP5.01/GD2*/
/*类说明:可以选择是/否裁图。
如果裁图则生成的图的尺寸与您输入的一样。
原则:尽可能多保持原图完整
如果不裁图,则按照原图比例生成新图
原则:根据比例以输入的长或者宽为基准*/
/*参 数:$img:源图片地址
$wid:新图的宽度
$hei:新图的高度
$c:是否裁图,1为是,0为否*/
/* Author: antplus */
/* version: 1.1 */
/* QQ: 38188141 */
/* MSN: [email]antplus@163.net[/email] */
/***************************************/
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)
{
//echo $img.$wid.$hei.$c;
$this->srcimg = $img;
$this->resize_width = $wid;
$this->resize_height = $hei;
$this->cut = $c;
//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();
//imagesx imagesy 取得图像 宽、高
$this->width = imagesx($this->im);
$this->height = imagesy($this->im);
//生成图象
$this->newimg();
ImageDestroy ($this->im);
}
function newimg()
{
// +----------------------------------------------------+
// | 增加LOGO到缩略图中 Modify By Ice
// +----------------------------------------------------+
//Add Logo
//$logoImage = ImageCreateFromJPEG('t_a.jpg');
//ImageAlphaBlending($this->im, true);
//$logoW = ImageSX($logoImage);
//$logoH = ImageSY($logoImage);
// +----------------------------------------------------+
//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
{
//imagecreatetruecolor — 新建一个真彩色图像
$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
//imagecopyresampled — 重采样拷贝部分图像并调整大小
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
// +----------------------------------------------------+
// | 增加LOGO到缩略图中 Modify By Ice
// +----------------------------------------------------+
//ImageCopy($newimg, $logoImage, 0, 0, 0, 0, $logoW, $logoH);
// +----------------------------------------------------+
//imagejpeg — 以 JPEG 格式将图像输出到浏览器或文件
ImageJpeg ($newimg,$this->dstimg);
echo "缩略图生成成功!";
}
if($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)/$resize_ratio));
// +----------------------------------------------------+
// | 增加LOGO到缩略图中 Modify By Ice
// +----------------------------------------------------+
//ImageCopy($newimg, $logoImage, 0, 0, 0, 0, $logoW, $logoH);
// +----------------------------------------------------+
ImageJpeg ($newimg,$this->dstimg);
echo "缩略图生成成功!";
}
}
else
//不裁图
{
if($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, $this->height);
// +----------------------------------------------------+
// | 增加LOGO到缩略图中 Modify By Ice
// +----------------------------------------------------+
//ImageCopy($newimg, $logoImage, 0, 0, 0, 0, $logoW, $logoH);
// +----------------------------------------------------+
ImageJpeg ($newimg,$this->dstimg);
echo "缩略图生成成功!";
}
if($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, $this->height);
// +----------------------------------------------------+
// | 增加LOGO到缩略图中 Modify By Ice
// +----------------------------------------------------+
//ImageCopy($newimg, $logoImage, 0, 0, 0, 0, $logoW, $logoH);
// +----------------------------------------------------+
ImageJpeg ($newimg,$this->dstimg);
echo "缩略图生成成功!";
}
}
// +----------------------------------------------------+
// | 释放资源 Modify By Ice
// +----------------------------------------------------+
//ImageDestroy($logoImage);
// +----------------------------------------------------+
}
//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);
}
}
/*
function initi_img($f)
{
//GetImageSize获取图像信息,数组表示,print_r ($data);
$data=GetImageSize($f);
switch($data[2]){
case 1:
$this->im = imagecreatefromgif($f);
break;
case 2:
$this->im = imagecreatefromjpeg($f);
break;
case 3:
$this->im = imagecreatefrompng($f);
break;
}
}
*/
//图象目标地址
function dst_img()
{
$full_length = strlen($this->srcimg);
$type_length = strlen($this->type);
$name_length = $full_length-$type_length;
$name = substr($this->srcimg,0,$name_length-1);
$this->dstimg = $name."_small.".$this->type;
}
}
/*
print_r($_FILES["file"]);
foreach ($_FILES["file"] as $key => $a)
{
echo $key."=============".$a."<br>";
}
*/
$tempimgname = strtolower($_FILES["file"][name]);
//mb_convert_encoding转换传输字集encod
$tempimgname = mb_convert_encoding( $tempimgname, "gb2312", "utf-8");
//echo $tempimgname;
$tmpfiletype = substr(strrchr($tempimgname,"."),1);
/*
echo $tmpfiletype."----------------"."<br>";
//explode 以某个字符串分割。
$firsttmpfilename = explode(".",$_FILES["file"][tmp_name]);
echo $firsttmpfilename[0]."<br>";
$tempimgname = $firsttmpfilename[0].".".$tmpfiletype;
echo $tempimgname."<br>";
*/
if($tmpfiletype=="jpg" || $tmpfiletype=="gif" || $tmpfiletype=="png")
{
if(copy($_FILES["file"]["tmp_name"],strtolower("image\\".date("Y-m-",time()).$tempimgname)))
{
//输出原来的文件名,大小,类型
echo "文件".strtolower($_FILES["file"]["name"])."<br>"."大小".$_FILES["file"]["size"]."<br>"."文件类型为".$_FILES["file"]["type"]."<br>"."文件上传成功!"."<br>";
}
else
{
echo "文件上传失败"."<br>";
}
$class = new resizeimage("image\\".date("Y-m-",time()).$tempimgname, 120, 160, 1);
}
else
{
echo "上传文件类型错误,请勿上传除jpg,gif,png以外的其他文件。";
}
?>
$class = new resizeimage("image\\".date("Y-m-",time()).$tempimgname, 120, 160, 1);内120,160为想改变的图像大小。1为截图,0为不截图,具体效果请自行体会。
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