multipart/form_data

It is a common MIME tag can upload any type of file.

1. is_upload_file: 
   By using this function we can check whether file is uploaded from browser temporary memory location to permanent memory.
2. move_uploaded_file:
   move is to uploaded file form temporary memory location to permanent memory location arguments are temporary memory location file name and permanent location.
   Example:
   <form method=”post” action=” upload.php” enctype=”multipart/form_data”>
   select file:<input type=”file” name= “f1″> <br>
   <input type=”submit” name=”sub” vale=”upload”>
   </fprm>
   <?php
   //print_r($_FILES);
   if (isset($_POST[‘sub’])){
   $fname= $_FILES[‘f1’][‘name’];
   if(move_upload_file($_FILE[‘f1’][‘tmp_name’], “uploads/$fname”))
   {
   echo “moved”;
   echo ‘<img src=”uploads/’.$fname.'” width=”100″ height=”100″/>’;
   }
   else
   {
   echo “Not moved”;
   }}
   ?>
3. Not to move .exefile:
   <?php
   $type=$_FILE[‘f1’][‘type’];
   if($type==”application/octet_stream”)
   echo “Exe not allowed”;
   else
   {
   $fname=$_FILES[‘f1’][‘name’];
   if(move_uploaded_file($_FILES[‘f1’][‘tmp_name’],”uploads/$fname”))
   echo “moved”
   else
   echo “Not moved”;
   ?>