PHP file upload related restrictions
Upload related restrictions
1 Client restrictions
<form action="doAction2.php" method="post" enctype="multipart/form-data"> <input type="hidden" name="MAX_FILE_SIZE" value="101321" /> 请选择您要上传的文件: <input type="file" name="myFile" accept="image/jpeg,image/gif,text/html"/><br/> <input type="submit" value="上传"/> </form>
The input attributes are used to limit the size and type of uploaded files, but personal feelings: First, the html code is "visible "; Second, it often doesn't work (I didn't find the reason, but because of the first one I also want to give up on it, just know it.
2 Server-side restrictions
Main restrictions on size and type , and then there is the method.
<?php header('content-type:text/html;charset=utf-8'); //接受文件,临时文件信息 $fileinfo=$_FILES["myFile"];//降维操作 $filename=$fileinfo["name"]; $tmp_name=$fileinfo["tmp_name"]; $size=$fileinfo["size"]; $error=$fileinfo["error"]; $type=$fileinfo["type"]; //服务器端设定限制 $maxsize=10485760;//10M,10*1024*1024 $allowExt=array('jpeg','jpg','png','tif');//允许上传的文件类型(拓展名 $ext=pathinfo($filename,PATHINFO_EXTENSION);//提取上传文件的拓展名 //目的信息 $path="uploads"; if (!file_exists($path)) { //当目录不存在,就创建目录 mkdir($path,0777,true); chmod($path, 0777); } //$destination=$path."/".$filename; //得到唯一的文件名!防止因为文件名相同而产生覆盖 $uniName=md5(uniqid(microtime(true),true)).$ext;//md5加密,uniqid产生唯一id,microtime做前缀 if ($error==0) { if ($size>$maxsize) { exit("上传文件过大!"); } if (!in_array($ext, $allowExt)) { exit("非法文件类型"); } if (!is_uploaded_file($tmp_name)) { exit("上传方式有误,请使用post方式"); } if (@move_uploaded_file($tmp_name, $uniName)) {//@错误抑制符,不让用户看到警告 echo "文件".$filename."上传成功!"; }else{ echo "文件".$filename."上传失败!"; } //判断是否为真实图片(防止伪装成图片的病毒一类的 if (!getimagesize($tmp_name)) {//getimagesize真实返回数组,否则返回false exit("不是真正的图片类型"); } }else{ switch ($error){ case 1: echo "超过了上传文件的最大值,请上传2M以下文件"; break; case 2: echo "上传文件过多,请一次上传20个及以下文件!"; break; case 3: echo "文件并未完全上传,请再次尝试!"; break; case 4: echo "未选择上传文件!"; break; case 7: echo "没有临时文件夹"; break; } }
Here, the specific implementation is commented, you can actually try it yourself, it is very interesting
3 Encapsulation
Function
<?php function uploadFile($fileInfo,$path,$allowExt,$maxSize){ $filename=$fileInfo["name"]; $tmp_name=$fileInfo["tmp_name"]; $size=$fileInfo["size"]; $error=$fileInfo["error"]; $type=$fileInfo["type"]; //服务器端设定限制 $ext=pathinfo($filename,PATHINFO_EXTENSION); //目的信息 if (!file_exists($path)) { mkdir($path,0777,true); chmod($path, 0777); } $uniName=md5(uniqid(microtime(true),true)).'.'.$ext; $destination=$path."/".$uniName; if ($error==0) { if ($size>$maxSize) { exit("上传文件过大!"); } if (!in_array($ext, $allowExt)) { exit("非法文件类型"); } if (!is_uploaded_file($tmp_name)) { exit("上传方式有误,请使用post方式"); } //判断是否为真实图片(防止伪装成图片的病毒一类的 if (!getimagesize($tmp_name)) {//getimagesize真实返回数组,否则返回false exit("不是真正的图片类型"); } if (@move_uploaded_file($tmp_name, $destination)) {//@错误抑制符,不让用户看到警告 echo "文件".$filename."上传成功!"; }else{ echo "文件".$filename."上传失败!"; } }else{ switch ($error){ case 1: echo "超过了上传文件的最大值,请上传2M以下文件"; break; case 2: echo "上传文件过多,请一次上传20个及以下文件!"; break; case 3: echo "文件并未完全上传,请再次尝试!"; break; case 4: echo "未选择上传文件!"; break; case 7: echo "没有临时文件夹"; break; } } return $destination; }
call
<?php header('content-type:text/html;charset=utf-8'); $fileInfo=$_FILES["myFile"]; $maxSize=10485760;//10M,10*1024*1024 $allowExt=array('jpeg','jpg','png','tif'); $path="uploads"; include_once 'upFunc.php'; uploadFile($fileInfo, $path, $allowExt, $maxSize);
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