显示图片之前,先把图片压缩后再显示,怎么做? php有现成的调有和,你安装GD图形模块 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 网上找的一个很好用的类,共享一下。<?/***************************************//*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*//***************************************/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????建的图象 var $im; function resizeimage($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(); //-- $this->width = imagesx($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() { $full_length = strlen($this->srcimg); $type_length = strlen($this->type); $name_length = $full_length-$type_length; $name = substr($this->srcimg,0,$name_length-1); $this->dstimg = $name."s.".$this->type; }}?> 循环显示成绩问题~ 请叫个 preg_replace 表达式 $_POST参数长度限制的问题 相当与ASP中的函数clnt,clng 关于php传值问题~ ie浏览器下本地服务器网站页面无变化! 本人准备开一个网络公司,正在找办公地点,找一名精通网络公司的发展,规划的朋友一起创业 php获取bing每日图片 session 会冲突吗? 请问如何知道<textarea文本框里的文字有多少行?????例子如下:请高手帮助。 PHP nusoap 调用 webservice 接口 问题 新手为学习散分咯~~~~!!!!
/***************************************/
/*功 能:利用PHP的GD库生成高质量的缩略图*/
/*运行环境:PHP5.01/GD2*/
/*类说明:可以选择是/否裁图。 如果裁图则生成的图的尺寸与您输入的一样。
原则:尽可能多保持原图完整 如果不裁图,则按照原图比例生成新图
原则:根据比例以输入的长或者宽为基准*/
/*参 数:$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*//***************************************/
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????建的图象
var $im; function resizeimage($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();
//--
$this->width = imagesx($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()
{
$full_length = strlen($this->srcimg);
$type_length = strlen($this->type);
$name_length = $full_length-$type_length;
$name = substr($this->srcimg,0,$name_length-1);
$this->dstimg = $name."s.".$this->type;
}
}
?>