有缩略图功能 但是 感觉不全面，而且有点问题，继续学习，将来以后修改下
<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; //FILESprotected $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){$this->fileerror="文件过大";return false;}return true;}//检测文件是否HTTPpublic function UpPost(){if(!is_uploaded_file($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>".$this->fileerror."</b>");}}}<?phpheader("content-type:imagejpeg");header("Content-type:text/html;charset=utf-8");require 'list.php';$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>
以上所述是小编给大家介绍的PHP上传图片类显示缩略图功能的相关知识，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
