php支持生成缩略图文件上传代码

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php支持生成缩略图文件上传代码

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<?php

class upfileclass {

var $upfile, $upfile_name, $upfile_size;

# $upfile 临时文件名 $_files['tmp_name'] ,$upfile_name 文件名 $_files['name'] ,$upfile_size 文件大小$_files['size'];

var $new_upfile_name;   # 上传后的文件名称 ;

var $fleth, $fileextent; # 文件扩展名(类型) ;

var $f1, $f2, $f3;   # 文件保存路径(多级) upfiles/2008-01/08/;

var $filename;    # 文件(带路径) ;

var $filepath; #相对路径用来删除文件;

var $maxsize, $file_type; # 允许上传文件的大小允许上传文件的类型 ;

var $buildfile,$newfile,$file_width,$file_height,$rate;

function upfileclass($upfile,$upfile_name,$upfile_size){

   $this->upfile = $upfile;

   $this->upfile_name = $upfile_name;

   $this->upfile_size = $upfile_size;

   $this->new_upfile_name = $this->createnewfilename($this->upfile_name);

   $this->f1 = "upfiles";

   $this->f2 = $this->f1."/".date('y')."-".date('m');

   $this->f3 = $this->f2."/".date('d');

   $this->filename = $this->f3 . "/" . $this->new_upfile_name;

   $this->maxsize = 500*1024;    # 文件大小 500kb

   $this->file_type = "gif/jpg/jpeg/png/bmp"; # 允许上传的文件类型

}

# 创建新文件名 (原文件名)

function createnewfilename($file_name){

    $this->fleth = explode(".",$file_name);

    $this->fileextent = $this->fleth[(int)count($this->fleth)-1]; # 获取文件后缀;

    $tmps教程tr = date('ymd').rand(0,time()) . "." .$this->fileextent;    # 创建新文件名;

    return $tmpstr;

}

# 检测文件类型是否正确

function chk_fileextent(){

    $iwtrue = 0;

    $fle = explode("/",$this->file_type);

    for($i=0; $i < count($fle); $i++){

     if($this->fileextent == $fle[$i]){

     $iwtrue = (int) $iwtrue + 1;

     }

    }

    if( $iwtrue == 0 ){

  $this->msg("文件不符合 ".$this->file_type." 格式!");

    }

}

# 提示错误信息并终止操作

function msg($error){

    echo "<script language="网页特效"> ";

    echo " alert('".$error."'); ";

    echo " window.history.back(); ";

    echo "</script> ";

    die();

}

# 保存文件

function savefile(){

    $this->chk_fileextent();

    $this->chk_filesize();

    $this->createfolder( "../".$this->f1 );

    $this->createfolder( "../".$this->f2 );

    $this->createfolder( "../".$this->f3 );

    return $this->chk_savefile();

}

# 检测上传结果是否成功

function chk_savefile(){

    $copymsg = copy($this->upfile,"../".$this->filename);

    if( $copymsg ){

   return $this->filename;

    }

    else{

   $this->msg("文件上传失败! 请重新上传! ");

    }

}

# 创建文件夹

function createfolder($foldername){

    if( !is_dir($foldername) ){

   mkdir($foldername,0777);

    }

}

# 检测文件大小

function chk_filesize(){

    if( $this->upfile_size > $this->maxsize ){

  $this->msg("目标文件不能大于". $this->maxsize/1024 ." kb");

    }

}

# 删除文件($filepath 文件相对路径)

function deletefile($filepath){

    if( !is_file($filepath) ){

   return false;

    }

    else{

   $ending = @unlink($filepath);

   return $ending;

    }

}

/*

    函数：生成缩略图

  makebuild("/www.phpfensi.com/a.jpg","news/b.jpg","100");

    参数：

    echo $buildfile;   原图带路径

    echo $newfile;    生成的缩略图带路径

    echo $file_width;   缩略图宽度值

    echo $file_height;   缩略图高度值 (默认为宽度的比例值)

    echo $rate;     缩略图象品质;

*/

function makebuild($buildfile,$newfile,$file_width,$file_height=0,$rate=100) {

    if(!is_file($buildfile)){

   $this->msg("文件 ".$buildfile." 不是一个有效的图形文件！系统无法生成该文件的缩略图！");

   return false;

    }

    $data = getimagesize($buildfile);

    switch($data[2]){

  case 1:

   $im = @imagecreatefromgif($buildfile);

   break;

  case 2:

   $im = @imagecreatefromjpeg($buildfile);

   break;

  case 3:

   $im = @imagecreatefrompng($buildfile);

   break;

    }

    if(!$im){

   return false;

    }

    else{

   $srcw = imagesx($im);  # 取得原图宽度;

   $srch = imagesy($im); # 取得原图高度;

   $dstx = 0;

   $dsty = 0;



  if($file_height==0){

   $file_height = $file_width/$srcw*$srch;

  }



  if ($srcw*$file_height>$srch*$file_width){

   $ffile_height = round($srch*$file_width/$srcw);

   $dsty = floor(($file_height-$ffile_height)/2);

   $ffile_width = $file_width;

  }

  else {

   $ffile_width = round($srcw*$file_height/$srch);

   $dstx = floor(($file_width-$ffile_width)/2);

   $ffile_height = $file_height;

  }

  $ni = imagecreatetruecolor($file_width,$file_height);

  $dstx = ($dstx<0)?0:$dstx;

  $dsty = ($dstx<0)?0:$dsty;

  $dstx = ($dstx>($file_width/2))?floor($file_width/2):$dstx;

  $dsty = ($dsty>($file_height/2))?floor($file_height/s):$dsty;

  imagecopyresized($ni,$im,$dstx,$dsty,0,0,$ffile_width,$ffile_height,$srcw,$srch);



  imagejpeg($ni,$newfile,$rate); # 生成缩略图;

  imagedestroy($im);     # imagedestroy(resource) 释放image关联的内存

    }

}

}

?>

//开源代码phpfensi.com

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原文链接：http://www.phpfensi.com/php/20140819/4482.html

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