Notes on PHP file upload system_PHP tutorial

The entire system only uses PHP for coding, no JS, no regular expressions... pure PHP... In fact, I don't know anything else...
The following is the html coding of the original form...
Upload file form

Copy code The code is as follows:

Map Name:




File Path:



< br />

The meaning of enctype="multipart/form-data" in the form is to set the MIME encoding of the form. By default, this encoding format is application/x-www-form-urlencoded, which cannot be used for file upload; only when multipart/form-data is used, the file data can be completely transferred and the following operations are performed. enctype="multipart/form -data" is to upload binary data; the value in the form is passed in a binary stream.
This sentence seems useless... I thought this could limit the upload file size. The upload file size is only available in php .ini or in the script of the file uploaded later... In my program, I directly set upload_max_filesize=6M in php.ini.
The following is the upload program
Code

Copy code The code is as follows:

$uploaddir="./map/";
$typearr=array("rar","zip", "w3m","w3x");
$findstr=array("/","\"," ","<",">"); //Filter names
$mapname =str_replace($findstr,'',($_POST['mapname']));
//Get the extension
function upfiletype($filename){
$arr=explode('.', $filename);
$a=count($arr)-1;
return $arr[$a];
}
//Is the string a pure number?
function isNo( $str){
$intarr=array('1','2','3','4','5','6','7','8','9','0 ','.');
$a=str_replace($intarr,'',$str);
return ($a=="")?1:0;
}
/ /////Control window size///////
function html(){
echo <<


<script> <br>function ResetSize(){ <br>self.resizeTo(300,300) <br>self.moveTo(300,200) <br>} <br></script>


eof;
}
if (isNo($mapname)){
html();
exit ('Correct map name entered');
}
//Determine whether there is a file uploaded
if(!is_uploaded_file($_FILES['map']['tmp_name'])){
html();
exit("You did not upload the file or The uploaded file is larger than 6M");
}
//Determine whether it is a repeated upload
$clintfilename=str_replace($findstr,'',$_FILES['map']['name']);
if(isset($_COOKIE['upload'])){
foreach($_COOKIE['upload'] as $value){
if($value==$clintfilename){
html ();
exit("Please do not upload again");
}
}
}
$filetype=strtolower(upfiletype($_FILES['map']['name'] ));
if(!in_array($filetype,$typearr)){
html();
exit("Please upload the correct map file, support rar, zip, w3m, w3x");
}
//Determine whether the server file exists
$filename=$mapname.'.'.$filetype;
for($a=1;$fopen=@fopen(($uploaddir. $filename),"r");$a++){
$filename=$mapname."$a".'.'.$filetype;
fclose($fopen);
}
//Start transferring files;
$filepath=$uploaddir.$filename;
if(move_uploaded_file($_FILES['map']['tmp_name'],$filepath)){
//Set one Cookie is used to check if there are repeated uploads
setcookie("upload[]",$clintfilename,time()+60*12);
html();
echo "Upload successful";
$log=fopen("upload.log","a7");
$logtxt=date("Ymd")."|".date("H:i")."|".$_SERVER[" REMOTE_ADDR"]."|".$filename."rn";
fwrite($log,$logtxt);
}
?>

Since this is my first time writing...there are many problems, and I changed them over and over again while writing...I forgot to give you any advice.

http://www.bkjia.com/PHPjc/320744.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/320744.htmlTechArticleThe entire system only uses PHP for coding, no JS, no regular expressions... pure PHP... In fact, I don’t know anything else haha... Below is the html code of the original form... Copy the code of the upload file form...