文件上传是项目开发中比较常见的功能，但文件上传的过程比较繁琐，只要是有文件上传的地方就需要编写这些复杂的代码。为了能在每次开发中降低功能的编写难度，也为了能节省开发时间，通常我们都会将这些反复使用的一段代码封装到一个类中。
<?php /** +----------------------------------------------------------------------------- * 文件上传类 +----------------------------------------------------------------------------- * @author Administrator +----------------------------------------------------------------------------- */ class FileUpload{ private $filepath; //保存路径 private $allowtype=array('gif','jpg','jpeg','png','txt'); private $maxsize=1000000; //最大允许上传大小 private $israndname=true; //是否随机 private $orginame; //原始文件名 private $tmpname; //临时文件名 private $newname; //新文件名 private $filetype; //文件类型 private $filesize; //文件大小 private $errornum=''; //错误号 private $errormsg; //错误信息 /** +------------------------------------------------------------------------------ *构造函数 +------------------------------------------------------------------------------ * @param string $savepath 保存路径 * @param string $allowtype 允许类型 * @param string $maxsize 允许大小 * +------------------------------------------------------------------------------ */ function __construct($option=array()){ foreach ($option as $key=>$value){ if (!in_array($key,get_class_vars(get_class($this)))){ continue; } $this->setOption($key, $value); } } function uploadfile($field) { $return=true; if (!$this->CheckPath()) { $this->errormsg=$this->geterrorNum(); return false; } $name=$_FILES[$field]['name']; $tmpname=$_FILES[$field]['tmp_name']; $filesize=$_FILES[$field]['size']; $error=$_FILES[$field]['error']; if (is_array($name)) { $errors=array(); for ($i=0;$i<count($name);$i++){ if ($this->getFile($name[$i],$tmpname[$i],$filesize[$i],$errors[$i])) { if (!$this->CheckSize() && !$this->CheckType()) { $errors=$this->getErrorNum(); return false; } }else{ $errors=$this->getErrorNum(); return false; } if (!$return) { $this->getFile(); } } if ($return) { $fileNames=array(); for ($i=0;$i<count($name);$i++){ if ($this->getFile($name[$i], $tmpname[$i], $filesize[$i], $filesize[$i])) { $this->SetFileName(); if (!$this->MoveFile()) { $errors[]=$this->getErrorNum(); $return=false; }else{ $fileNames[]=$this->getNewName(); } } } $this->newname=$fileNames; } $this->errormsg=$errors; return $return; }else{ if($this->getFile($name,$tmpname,filesize,$error)){ if(!$this->CheckSize()){ return false; } if(!$this->CheckType()){ return false; } $this->SetFileName(); if ($this->MoveFile()) { return true; } }else{ return false; } if (!$return) { $this->setOption('ErrorNum', 0); $this->errormsg=$this->geterrorNum(); } return $return; } } /** +------------------------------------------------------------------------ *设置类属性值函数 +------------------------------------------------------------------------ * @param mix $key * @param mix $value */ private function setOption($key,$value){ $key=strtolower($key); $this->$key=$value; } /** +--------------------------------------------------------------------------- * 获取文件变量参数函数 +--------------------------------------------------------------------------- * @param string $name * @param string $tmp_name * @param number $size * @param number $error */ private function getFile($name,$tmpname,$filetype,$filesize,$error=0){ $this->setOption('TmpName', $tmpname); $this->setOption('OrgiName', $name); $arrstr=explode('.', $name); $this->setOption('FileType', $arrstr[count($arrstr)-1]); $this->setOption('FileSize', $filesize); return true; } /** +------------------------------------------------------------------------- * 检查上传路径函数 +------------------------------------------------------------------------- * @return boolean */ private function CheckPath(){ if(empty($this->filepath)){ $this->setOption('ErrorNum', -5); return false; } if (!file_exists($this->filepath)||!is_writable($this->filepath)) { if (!@mkdir($this->filepath,0755)) { $this->setOption('ErrorNum',-4); return false; } } return true; } private function Is_Http_Post(){ if (!is_uploaded_file($this->tmpname)) { $this->setOption('ErrorNum',-6); return false; }else{ return true; } } /** +-------------------------------------------------------------------- *检查文件尺寸函数 +-------------------------------------------------------------------- * @return boolean */ private function CheckSize(){ if ($this->filesize>$this->maxsize) { $this->setOption('ErrorNum', -2); return false; }else{ return true; } } /** +--------------------------------------------------------------- * 检查文件类型函数 +--------------------------------------------------------------- * @return boolean */ private function CheckType(){ if (in_array($this->filetype, $this->allowtype)) { return true; }else{ $this->setOption('ErrorNum', -1); return false; } } private function SetFileName(){ if ($this->israndname) { $this->setOption('NewName', $this->RandName()); }else{ $this->setOption('NewName',$this->orginame); } } /** +----------------------------------------------------------------- * 获取新文件名 +------------------------------------------------------------------ */ public function getNewName() { return $this->newname; } private function RandName(){ $rule=date("YmdHis").rand(0, 999); return $rule.'.'.$this->filetype; } private function MoveFile(){ if ($this->errornum) { $filepath=rtrim($this->filaepath,'https://www.jb51.net/').'https://www.jb51.net/'; $filepath.=$this->newname; if (@move_uploaded_file($this->tmpname,$filepath)) { return true; }else{ $this->errormsg=$this->setOption('ErrorNum',-3 ); } }else{ return false; } } /** +---------------------------------------------------------------- * 错误信息函数 +---------------------------------------------------------------- * @return string */ function getErrorNum() { $erstr="上传文件<font color='red'>{$this->orginame}</font>出错"; switch ($this->errornum) { case 4: $erstr.="没有文件被上传"; break; case 3: $erstr.="文件只被部分上传"; break; case 2: $erstr.="上传文件超过了HTML表单MAX_FILE_SIZE指定的值"; break; case 1: $erstr.="上传文件超过了php.ini配置文件中upload_max_filesize的值"; break; case 0: $erstr="上传{$this->orginame}成功"; break; case -1: $erstr="未允许的类型"; break; case -2: $erstr.="文件过大，不能超过{$this->maxsize}个字节"; break; case -3: $erstr.="上传失败"; break; case -4: $erstr="创建上传目录失败，请重新指定上传目录"; break; case -5: $erstr="未指定上传路径"; break; case -6: $erstr="非法操作"; break; default: $erstr.="未知错误"; } return $erstr; } } ?>