Adding Restrictions To File Upload

[jacobmathias]

Hello, I am making an upload script and I want to restrict all file types except png, jpg, and gif. I can't seem to figure it out and help would be appreciated!!

 

<?php 
$target = "images/"; 
$target = $target . basename( $_FILES['uploaded']['name']) ; 
$ok=1; 

//This is our size condition 
if ($uploaded_size > 230000) 
{ 
echo "Your file is too large.<br>"; 
$ok=0; 
} 

if (!($uploaded_type=="image/gif")) 
{ 
echo "You may only upload GIF files.<br>"; 
$ok=0; 
}


//Here we check that $ok was not set to 0 by an error 
if ($ok==0) 
{ 
Echo "Sorry your file was not uploaded"; 
} 

//If everything is ok we try to upload it 
else 
{ 
if(move_uploaded_file($_FILES['uploaded']['tmp_name'], $target)) 
{ 
echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded"; 
} 
else 
{ 
echo "Sorry, there was a problem uploading your file."; 
} 
} 
?> 

[schilly]

$_FILES['uploaded']['type'] is the mime type of the uploaded file. Check this against 'image/jpeg', 'image/pjpeg', 'image/gif', 'image/png'. If it doesn't match one of those reject it.