PHP如何实现上传图片类显示缩略图功能

<form action="<?php $_SERVER['PHP_SELF']; ?>" enctype="multipart/form-data" method="post" ><input type="text" name="name" /><input type="file" name="file" /><input type="submit" name='submit' value="提交" ></form> <?php /** * Created by PhpStorm. * User: Administrator * Date: 2016/6/28 * Time: 21:04 */ class upload{ protected $fileMine;//文件上传类型 protected $filepath;//文件上传路径 protected $filemax;//文件上传大小 protected $fileExt;//文件上传格式 protected $filename;//文件名 protected $fileerror;//文件出错设置 protected $fileflag;//文件检测 protected $fileinfo; //FILES protected $ext; //文件扩展 protected $path; //文件上传 public function __construct($filename="file",$filemax=20000000,$filepath="./Uploads",$fileflag=true,$fileExt=array('jpg','exe'),$fileMine=array('image/jpeg')) { $this->filename=$filename; $this->fileinfo=$_FILES[$this->filename]; $this->filemax=$filemax; $this->filepath=$filepath; $this->fileflag=$fileflag; $this->fileExt=$fileExt; $this->fileMine=$fileMine; //var_dump($this->filename); } //错误判断 public function UpError(){ if($this->fileinfo['error']>0){ switch($this->fileinfo['error']) { case 1: $this->fileerror="上传文件大小超过服务器允许上传的最大值，php.ini中设置upload_max_filesize选项限制的值 "; break; case 2: $this->fileerror="上传文件大小超过HTML表单中隐藏域MAX_FILE_SIZE选项指定的值"; break; case 3: $this->fileerror="文件部分被上传"; break; case 4: $this->fileerror="没有选择上传文件"; break; case 5: $this->fileerror="未找到临时目录"; break; case 6: $this->fileerror="文件写入失败"; break; case 7: $this->fileerror="php文件上传扩展没有打开 "; break; case 8: $this->fileerror=""; break; } return false; } return true; } //检测文件类型 public function UpMine(){ if(!in_array($this->fileinfo['type'],$this->fileMine)) { $this->error="文件上传类型不对"; return false; } return true; } //检测文件格式 public function UpExt(){ $this->ext=pathinfo($this->fileinfo['name'],PATHINFO_EXTENSION); //var_dump($ext); if(!in_array($this->ext,$this->fileExt)){ $this->fileerror="文件格式不对"; return false; } return true; } //检测文件路径 public function UpPath(){ if(!file_exists($this->filepath)){ mkdir($this->filepath,0777,true); } } //检测文件大小 public function UpSize(){ $max=$this->fileinfo['size']; if($max>$this->filemax){ $this->fileerror="文件过大"; return false; } return true; } //检测文件是否HTTP public function UpPost(){ if(!is_uploaded_file($this->fileinfo['tmp_name'])){ $this->fileerror="恶意上偿还"; return false; } return true; } //文件名防止重复 public function Upname(){ return md5(uniqid(microtime(true),true)); } //图片缩略图 public function Smallimg($x=100,$y=100){ $imgAtt=getimagesize($this->path); //图像宽，高，类型 $imgWidth=$imgAtt[0]; $imgHeight=$imgAtt[1]; $imgext=$imgAtt[2]; //等比列缩放 if(($x/$imgWidth)>($y/$imgHeight)){ $bl=$y/$imgHeight; }else{ $bl=$x/$imgWidth; } $x=floor($imgWidth*$bl); //缩放后 $y=floor($imgHeight*$bl); $images=imagecreatetruecolor($x,$y); $big=imagecreatefromjpeg($this->path); imagecopyresized($images,$big,0,0,0,0,$x,$y,$imgWidth,$imgWidth); switch($imgext){ case 1: $imageout=imagecreatefromgif($this->path); break; case 2: $imageout=imagecreatefromjpeg($this->path); break; case 3: $imageout=imagecreatefromgif($this->path); break; } $im=imagejpeg($images,$this->path); } //文件双传 public function uploads() { if($this->UpError()&&$this->UpMine()&&$this->UpExt()&&$this->UpSize()&&$this->UpPost()){ $this->UpPath(); $names=$this->Upname(); $this->path=$this->filepath.'/'. $names.'.'.$this->ext; if(move_uploaded_file($this->fileinfo['tmp_name'], $this->path)){ return $this->path; }else{ $this->fileerror="上传失败"; } }else{ exit("<b>".$this->fileerror."</b>"); } } } <?php header("content-type:imagejpeg"); header("Content-type:text/html;charset=utf-8"); require 'list.php'; $u=new upload(); $a=$u->uploads(); $c=$u->Smallimg(); echo "<img src={$a} />"; echo "<img src={$c} />"; ?> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <title>Examples</title> <meta name="description" content=""> <meta name="keywords" content=""> <link href="" rel="stylesheet"> </head> <body> <form action="ce.php" enctype="multipart/form-data" method="post" > <input type="text" name="name" /><input type="file" name="file" /> <input type="submit" name='submit' value="提交" > </form> </body> </html>

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