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PHP缩略图生成类


Jamers
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网上有很多这样的类,我也只是根据原有内容稍加修改,以适合我的要求。

 

文中内容出自:http://www.open-open.com/lib/view/open1378556584084.html

与上文中添加功能如下:

1. 修正目标生成缩略图目录指向功能,原代码无效

2. 增加前缀及后缀功能,用于自定义缩略图文件名

3. 修改少许参数类型

4. 使用完整路径以保证其它目录也可生成相应缩略图

 

附上代码:

<?php
/**
 * 功能:php生成缩略图片的类
 * new ResizeImage('upload/abc.bmp', 120, 90, false, 'test/','aa|bc');
 */
    class ResizeImage{
        /**
         * 缩略图生成类
         * 来源:http://www.open-open.com/lib/view/open1378556584084.html
         * Modifyed by Jamers @ 2015.1.28
         */
        public $type;//图片类型
        public $width;//实际宽度
        public $height;//实际高度
        public $add;    //文件名前缀或后缀,默认前缀加t,用|分隔前缀后缀
        public $resize_width;//改变后的宽度
        public $resize_height;//改变后的高度
        public $cut;//是否裁图
        public $srcimg;//源图象 
        public $dstimg;//目标图象地址
        public $im;//临时创建的图象
        public $quality;//图片质量
        //public $outimg; //输出的缩略图完整路径
/**
         * PHP生成缩略图类
         *
         * @param string 图像文件
         * @param interval 宽度
         * @param interval 高度
         * @param boolean  是否切图
         * @param string  缩略图路径,用 /结尾
         * @param string  前缀及后缀用 |分隔
         * @param interval 图像品质
         */
        function resizeimage($img,$wid,$hei,$c,$dstpath='',$add='t|',$quality=100){
            //$dstpath 为空时,默认为当前目录
            $rp = pathinfo(realpath($_SERVER['DOCUMENT_ROOT'].$_SERVER['SCRIPT_NAME']))['dirname'];
            $this->srcimg=$img;
            $realpath = realpath($rp.'/'.$img);
            if ($realpath) $this->srcimg = $realpath;
            $this->resize_width=$wid;
            $this->resize_height=$hei;
            $this->cut=$c;
            $this->add = explode('|',$add); //0 前缀 1 后缀
            $this->quality=$quality;
            $this->type=strtolower(substr(strrchr($this->srcimg,'.'),1));//图片的类型
            $this->initi_img();//初始化图象
            $this->dst_img($dstpath);//目标图象地址
            @$this->width=imagesx($this->im);
            @$this->height=imagesy($this->im);
            $this->newimg();//生成图象
            @ImageDestroy($this->im);
        }
        function newimg(){
            $resize_ratio=($this->resize_width)/($this->resize_height);//改变后的图象的比例
            @$ratio=($this->width)/($this->height);//实际图象的比例
            if(($this->cut)==true){//裁图
                if($img_func==='imagepng'&&(str_replace('.','',PHP_VERSION)>=512)){  //针对php版本大于5.12参数变化后的处理情况
                    $quality=9;
                }
                if($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,$this->quality);
                }
                if($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,$this->quality);
                }
            }else{//不裁图
                if($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,$this->dstimg,$this->quality);
                }
                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,$this->dstimg,$this->quality);
                }
            }
        }
        function initi_img(){//初始化图象
            if($this->type=='jpg' || $this->type=='jpeg'){
                $this->im=imagecreatefromjpeg($this->srcimg);
            }
            if($this->type=='gif'){
                $this->im=imagecreatefromgif($this->srcimg);
            }
            if($this->type=='png'){
                $this->im=imagecreatefrompng($this->srcimg);
            }
            if($this->type=='wbm'){
                @$this->im=imagecreatefromwbmp($this->srcimg);
            }
            if($this->type=='bmp'){
                $this->im=$this->ImageCreateFromBMP($this->srcimg);
            }
        }
        function dst_img($dstpath){//图象目标地址
            if ($dstpath=='') {
                //目标路径为空,当前目录
                $dstpath = $this->srcimg;
            }
            $pa = pathinfo($this->srcimg);
            $dst = ($this->add[0]?$this->add[0].'_':'').$pa['filename'].($this->add[1]?'_'.$this->add[1]:'').'.'.$this->type;
            $dstpath = str_replace('\\','/',$dstpath);
            $dstpath = substr($dstpath,0,strrpos($dstpath,'/'));
            $this->dstimg=($dstpath?$dstpath.'/':'').$dst;
            //echo $this->dstimg;
        }
         
        function ImageCreateFromBMP($filename){ //自定义函数处理bmp图片
            if(!$f1=fopen($filename,"rb")) return FALSE;
            $FILE=unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset",fread($f1,14));
            if($FILE['file_type']!=19778) return FALSE;
            $BMP=unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
                    '/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
                    '/Vvert_resolution/Vcolors_used/Vcolors_important',fread($f1,40));
            $BMP['colors']=pow(2,$BMP['bits_per_pixel']);
            if($BMP['size_bitmap']==0)$BMP['size_bitmap']=$FILE['file_size']-$FILE['bitmap_offset'];
            $BMP['bytes_per_pixel']=$BMP['bits_per_pixel']/8;
            $BMP['bytes_per_pixel2']=ceil($BMP['bytes_per_pixel']);
            $BMP['decal']=($BMP['width']*$BMP['bytes_per_pixel']/4);
            $BMP['decal']-=floor($BMP['width']*$BMP['bytes_per_pixel']/4);
            $BMP['decal']=4-(4*$BMP['decal']);
            if($BMP['decal']==4)$BMP['decal']=0;
            $PALETTE=array();
            if($BMP['colors']<16777216)
            {
                $PALETTE=unpack('V'.$BMP['colors'],fread($f1,$BMP['colors']*4));
            }
            $IMG=fread($f1,$BMP['size_bitmap']);
            $VIDE=chr(0);
            $res=imagecreatetruecolor($BMP['width'],$BMP['height']);
            $P=0;
            $Y=$BMP['height']-1;
            while($Y>=0)
            {
                $X=0;
                while($X<$BMP['width'])
                {
                    if($BMP['bits_per_pixel']==24)
                        $COLOR=unpack("V",substr($IMG,$P,3).$VIDE);
                    elseif($BMP['bits_per_pixel']==16)
                    {
                        $COLOR=unpack("n",substr($IMG,$P,2));
                        $COLOR[1]=$PALETTE[$COLOR[1]+1];
                    }
                    elseif($BMP['bits_per_pixel']==8)
                    {
                        $COLOR=unpack("n",$VIDE.substr($IMG,$P,1));
                        $COLOR[1]=$PALETTE[$COLOR[1]+1];
                    }
                    elseif($BMP['bits_per_pixel']==4)
                    {
                        $COLOR=unpack("n",$VIDE.substr($IMG,floor($P),1));
                        if(($P*2)%2==0)$COLOR[1]=($COLOR[1]>>4);else$COLOR[1]=($COLOR[1]&0x0F);
                        $COLOR[1]=$PALETTE[$COLOR[1]+1];
                    }
                    elseif($BMP['bits_per_pixel']==1)
                    {
                        $COLOR=unpack("n",$VIDE.substr($IMG,floor($P),1));
                        if(($P*8)%8==0)$COLOR[1]=$COLOR[1]>>7;
                        elseif(($P*8)%8==1)$COLOR[1]=($COLOR[1]&0x40)>>6;
                        elseif(($P*8)%8==2)$COLOR[1]=($COLOR[1]&0x20)>>5;
                        elseif(($P*8)%8==3)$COLOR[1]=($COLOR[1]&0x10)>>4;
                        elseif(($P*8)%8==4)$COLOR[1]=($COLOR[1]&0x8)>>3;
                        elseif(($P*8)%8==5)$COLOR[1]=($COLOR[1]&0x4)>>2;
                        elseif(($P*8)%8==6)$COLOR[1]=($COLOR[1]&0x2)>>1;
                        elseif(($P*8)%8==7)$COLOR[1]=($COLOR[1]&0x1);
                        $COLOR[1]=$PALETTE[$COLOR[1]+1];
                    }
                    else
                        return FALSE;
                    imagesetpixel($res,$X,$Y,$COLOR[1]);
                    $X++;
                    $P+=$BMP['bytes_per_pixel'];
                }
                $Y--;
                $P+=$BMP['decal'];
            }
            fclose($f1);
            return $res;
        }
         
    }
?>
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