php图片上传

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php 图片上传

具体实现：

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="Action.php" method="post" enctype="multipart/form-data">
    请选择您要上传的文件：<input type="file" name='myFile1' />
    <input type="submit" value="上传文件" />
</form>
</body>
</html>

action.php

<?php
header('content-type:text/html;charset=utf-8');
require_once 'upload.php';
$upload=new upload('myFile1','files');
$dest=$upload->uploadFile();
echo $dest;

upload.php

<?php
class upload{
protected $fileName;			// 文件名
protected $maxSize;			// 文件最大值
protected $allowMime;		// 允许的文件类型
protected $allowExt;			// 允许的文件名
protected $uploadPath;		// 上传路径
protected $imgFlag;			// 检测是否真实图片文件
protected $fileInfo;				// 文件信息数组
protected $error;					// 检测上传文件是否出错
protected $ext;					// 扩展名变量
 
/**
* @param string $fileName
* @param string $uploadPath
* @param string $imgFlag
* @param number $maxSize
* @param array $allowExt
* @param array $allowMime
*/
public function __construct($fileName='myFile',$uploadPath='./uploads',$imgFlag=true,$maxSize=5242880,$allowExt=array('jpeg','jpg','png','gif'),$allowMime=array('image/jpeg','image/png','image/gif')){
$this->fileName=$fileName;
$this->maxSize=$maxSize;
$this->allowMime=$allowMime;
$this->allowExt=$allowExt;
$this->uploadPath=$uploadPath;
$this->imgFlag=$imgFlag;
$this->fileInfo=$_FILES[$this->fileName];
}
 
/**
* 检测上传文件是否出错
* @return boolean
*/
protected function checkError(){if(!is_null($this->fileInfo)){if($this->fileInfo['error']>0){switch($this->fileInfo['error']){
case 1:
$this->error='超过了 PHP 配置文件中 upload_max_filesize 选项的值';
break;
case 2:
$this->error='超过了表单中 MAX_FILE_SIZE 设置的值';
break;
case 3:
$this->error='文件部分被上传';
break;
case 4:
$this->error='没有选择上传文件';
break;
case 6:
$this->error='没有找到临时目录';
break;
case 7:
$this->error='文件不可写';
break;
case 8:
$this->error='由于 PHP 的扩展程序中断文件上传';
break;
 
}
return false;
}else{return true;}
}else{
$this->error='文件上传出错';
return false;
}
}
/**
* 检测上传文件的大小
* @return boolean
*/
protected function checkSize(){if($this->fileInfo['size']>$this->maxSize){
$this->error='上传文件过大';
return false;
}
return true;
}
/**
* 检测扩展名
* @return boolean
*/
protected function checkExt(){$this->ext=strtolower(pathinfo($this->fileInfo['name'],PATHINFO_EXTENSION));  //pathinfo() 函数返回关于文件路径的信息，[extension]: 返回文件路径中文件的类型的部分
if(!in_array($this->ext,$this->allowExt)){
$this->error='不允许的扩展名';
return false;
}
return true;
}
/**
* 检测文件的类型
* @return boolean
*/
protected function checkMime(){if(!in_array($this->fileInfo['type'],$this->allowMime)){
$this->error='不允许的文件类型';
return false;
}
return true;
}
/**
* 检测是否是真实图片
* @return boolean
*/
protected function checkTrueImg(){if($this->imgFlag){if(!@getimagesize($this->fileInfo['tmp_name'])){
$this->error='不是真实图片';
return false;
}
return true;
}
}
/**
* 检测是否通过 HTTP POST 方式上传上来的
* @return boolean
*/
protected function checkHTTPPost(){if(!is_uploaded_file($this->fileInfo['tmp_name'])){
$this->error='文件不是通过 HTTP POST 方式上传上来的';
return false;
}
return true;
}
/**
* 显示错误
*/
protected function showError(){exit('<span style="color:red">'.$this->error.'</span>');
}
/**
* 检测目录不存在则创建
*/
protected function checkUploadPath(){if(!file_exists($this->uploadPath)){mkdir($this->uploadPath,0777,true);
}
}
/**
* 产生唯一字符串作为文件名
* @return string
*/
protected function getUniName(){return md5(uniqid(microtime(true),true));
}
/**
* 上传文件
* @return string
*/
public function uploadFile(){if($this->checkError()&&$this->checkSize()&&$this->checkExt()&&$this->checkMime()&&$this->checkTrueImg()&&$this->checkHTTPPost()){$this->checkUploadPath();
$this->uniName=$this->getUniName();
$this->destination=$this->uploadPath.'/'.$this->uniName.'.'.$this->ext;
if(@move_uploaded_file($this->fileInfo['tmp_name'], $this->destination)){return  "上传成功，".$this->destination;}else{
$this->error='文件移动失败';
$this->showError();}
}else{$this->showError();
}
}
}

正文完