Bug dans mon script d'Upload de fichiers

<?php
if(isset($_POST['addport'])){
	/*if the submit button that is related to adding a port is validated 
	 * then */
	 
	 /* is the file correctly uploaded ?*/
	if(isset($_FILES['photo'])&&($_FILES['photo']['error'])==0){
		 
		 /* check if the file is not too voluminous */
		 if($_FILES['photo']['size']<=3000000000){
		 	
		 /* extract basic file information */
	     $file_info=pathinfo($_FILES['photo']['name']);
	 
	     /* check the extension of the file */
	     $file_extension=$file_info['extension'];
	 
	    /*the allowed extensions*/
	    $allowed_extensions=array('jpg','png','jpeg','gif');
	 
	    /* check if the file extension is allowed or not */
	    if(in_array($file_extension,$allowed_extensions)){
	 	
	    	$file_name=time().'.'.$file_extension;
	 	    copy($_FILES['photo']['tmp_name'],'uploads/'.$file_name);
	 	
	 	   /*the file has been correctly uploaded */
	 	   echo'The file has been correctly uploaded';
	 
	       if(!empty($_POST['name']) && !empty($_POST['unlocator']) && !empty($_POST['idnumber']) && !empty($_POST['position']) && !empty($_POST['berths']) && !empty($_POST['draft'])){
		   /* if all the fields are not empty then */
		
		   /*First , I retrieve all the data */
		
		   $name=$_POST['name'];
		   $unlocator=$_POST['unlocator'];
		   $idnumber=$_POST['idnumber'];
		   $position=$_POST['position'];
		   $berths=$_POST['berths'];
		   $draft=$_POST['draft'];
		   include('../Cfg/config.inc.php');
		   $link=mysql_connect($SERVER,$USER,$PWD) or die('Can not connect to the MySQL Server<br/>'.mysql_error());
		   mysql_select_db($DB) or die('Can not connect to the requested database<br/>'.mysql_error());
		   /* i need to inject the data to the ports table */
		
           mysql_query("INSERT INTO ports (name,unlocator,idnumber,position,berths,draft,photo)VALUES ('$name','$unlocator','$idnumber','$position','$berths','$draft','$file_name')")or die('Insertion problem<br/>'.mysql_error());
           
           echo'<br/>Ports data is correctly inserted ! <br/>';
           
		   
		 }else{
		/* at least one of the fields is empty */
		 echo'<font color="red">At least one field is empty, please, try again</font> <br/>!';
	    }
	  }else{
	 	echo'Your photo must have a JPG, JPEG, PNG or GF format !';
	 } 
		 }/*file is not too voluminous */
	}/* file correctly uploaded */	
}/* submit button pressed */

<?php
session_start();
if(!isset($_SESSION['login'])){
	header('Location:index.php');
	exit();
}
require_once('Includes/aheader.inc.php');
?>

<div id="content">

 <div class="pagetitle">
  <p align="center">Add files (downloads) :</p>
 </div>
 <p class="zonetext">
 You can add a new file to your downloads area from here : </p>
 
  <?php
 if(isset($_POST['addthisfile'])){
  /* if the add button has been pressed */
  if(isset($_FILES['downloadablefile'])&&$_FILES['downloadablefile']['error']==0){
  	/*is the file correctly uploaded ?*/
  	
  	if($_FILES['downloadablefile']['size']<=30000000000){
  		/*I checked if the file is not too voluminous*/
  		
  		$fichier_info=$_FILES['downloadablefile']['name'];
  		/*extract the file name basic information */
  		
  		$extensiondufichier=$fichier_info['extension'];
  		/*the extension of the file */
  		
  		$extensions_autorisees=array('pdf','doc','docx');
  		/*list of allowed extensions*/
  		
  		if(in_array($extensiondufichier,$extensions_autorisees)){
  			$systemfname=time().'.'.$extensiondufichier;
  			copy($_FILES['downloadablefile']['tmp_name'],'uploads'.$systemfname);
  			echo'The file has been correctly uploaded<br/>';
  			
  			if(!empty($_POST['filename'])&&$_POST['filedescription']){
  				$filename=addslashes($_POST['filename']);
  				$filedescription=addslashes($_POST['filedescription']);
  				include('../Cfg/config.inc.php');
  				$l=mysql_connect($SERVER,$USER,$PWD)or die('Impossible to connect to the MySQL Server<br/>'.mysql_error());
  				mysql_select_db($DB)or die('Impossible to select the requested database !<br/>'.mysql_error());
  				mysql_query("INSERT INTO downloads(userfilename,systemfilename,filedescription) VALUES('$filename','$systemfname','$filedescription')")or die('Insertion problem<br/>'.mysql_error());
  				
  			}else{/*at least one of the fields is empty*/
  				echo'<font color="red">At least one of the fields is empty<br/></font>';
  			}
  		}else{/*not allowed format,extension*/
  			echo'<font color="red">Only PDF, DOC and DOCX files are allowed !</font>';
  		}
  	}else{/*file is too voluminous*/
  		echo'<font color="red">Your file is too voluminous !!</font>';
  	}
  }else{/*file not correctly uploaded*/
  	echo'<font color="red">Your file has not been correctly uploaded !</font>';
  }
 }
  
  ?>
 <form action="addfile.php"method="post" enctype="multipart/form-data">
 <table align="center" class="tableass"> 
 <tr>
  <td class="boldtd">File's name <font color="orange">*</font> : </td><td align="left"><input type="text" name="filename"/></td>
 </tr>
 <tr>
  <td class="boldtd">Description <font color="orange">*</font> : </td><td align="right"> <textarea name="filedescription" rows="10" cols="50" wrap="off"></textarea></td>	
 </tr>
  <td colspan="2">&nbsp;</td>
 </tr>
 <tr>
  <td colspan="2" align="center" class="boldtd2">File <font color="orange">*</font> :</td>
 </tr>
 <tr>
  <td colspan="2"> &nbsp;</td>
 </tr>
 <tr>
  <td colspan="2" align="center"><input type="file" name="downloadablefile"/></td>
 </tr>
  <tr>
  <td colspan="2" align="right"><input type="submit" name="addthisfile" value="Add"/></td>
  <tr>
 </table>
 </form>
</div>
<?php
require_once('Includes/afooter.inc.php');
?>