Jamers Posted January 28, 2015 Report Share Posted January 28, 2015 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; } } ?> Link to comment Share on other sites More sharing options...
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