PHP生成等比缩略图类和自定义函数分享
发布:smiling 来源: PHP粉丝网 添加日期:2021-03-02 15:36:33 浏览: 评论:0
这篇文章主要介绍了PHP生成等比缩略图类和自定义函数分享,分别封装成了一个类和自定义函数,需要的朋友可以参考下。
共有两种等比例缩略图方法可以借鉴
一、为类文件,实例化之后即可使用
二、为自定义方法,比较轻巧
类文件代码如下:
- $resizeimage = new resizeimage("./shawn.jpg", "200", "100", "0","../pic/shawnsun.jpg");
- //实例化下面的类,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,第四个参数为可选 0不截图,1为截图
- <?php
- class resizeimage{
- //图片类型
- public $type;
- //实际宽度
- public $width;
- //实际高度
- public $height;
- //改变后的宽度
- public $resize_width;
- //改变后的高度
- public $resize_height;
- //是否裁图
- public $cut;
- //源图象
- public $srcimg;
- //目标图象地址
- public $dstimg;
- //临时创建的图象
- public $im;
- function resizeimage($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);
- //W & H
- $this->width = imagesx($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 $this->dstimg;
- }
- }
- ?>
自定义方法,代码如下:
- thumbs('shawn.jpg','shawnsun.jpg',100,100);
- <?php
- function thumbs($FileName,$SaveTo,$SetW,$SetH){
- $IMGInfo= getimagesize($FileName);
- if(!$IMGInfo) return false;
- if($IMGInfo['mime']== "image/pjpeg" || $IMGInfo['mime']=="image/jpeg"){
- $ThisPhoto= imagecreatefromjpeg($FileName);
- }elseif($IMGInfo['mime']== "image/x-png" || $IMGInfo['mime']== "image/png"){
- $ThisPhoto= imagecreatefrompng($FileName);
- }elseif($IMGInfo['mime']== "image/gif"){
- $ThisPhoto=imagecreatefromgif($FileName);
- }
- $width=$IMGInfo[0];
- $height=$IMGInfo[1];
- $scalc = max($width/$SetW,$height/$SetH);
- $nw = intval($width/$scalc);
- $nh = intval($height/$scalc);
- echo "缩略大小:w$nw,h$nh <br /-->";
- if($SetW-$nw == 1){$nw = $SetW;}
- if($SetH-$nh == 1){$nh = $SetH;}
- echo "+修正1像素: w$nw,h$nh<br>";
- //补宽
- if($SetW-$nw > 0){
- $nh = $nh +(($nh/$nw) * ($SetW-$nw));
- echo "*需补宽".($SetW-$nw).",陪补高".(($nh/$nw) * ($SetW-$nw))." <br>";
- $nw = $SetW;
- }
- //补高
- if($SetH-$nh > 0){
- $nw = $nw + (($nw/$nh) * ($SetH-$nh));
- echo "*需补高".($SetH-$nh).",陪补宽". (($nw/$nh) * ($SetH-$nh)) ."<br>";
- $nh = $SetH;
- }
- $nw = intval($nw);
- $nh = intval($nh);
- echo "+修正大小:w$nw,h$nh<br>";
- $px = ($SetW - $nw)/2;
- $py = ($SetH - $nh)/2;
- echo "窗口大小:w$SetW,h$SetH <br>";
- echo "+偏移修正:x$px,y$py <br>";
- $NewPhoto=imagecreatetruecolor($SetW,$SetH);
- imagecopyresized($NewPhoto,$ThisPhoto,$px,$py,0,0,$nw,$nh,$width,$height);
- ImageJpeg ($NewPhoto,$SaveTo);
- return true;
- }
- ?>
Tags: PHP生成等比缩略图
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