[baderandsonsco]

Here's one that I just wrote for my site.
name yourfolder and yourfile accordingly.
this only accepts .zip files, but you can change it to whatever through $allowed_ext
don't forget to set a proper filesize in the form.

Hope this helps.

<?php
$target_path = "/full/target/path/yourfolder/";
$uploadfile = $target_path . basename($_FILES['yourfile']['name']);
$allowed_ext = ".zip";
	
$badsubmit = '';
if ( $_POST['submitted'] ) {
	$originalname = $_FILES['yourfile']['name'];
	$extpos = strrpos( $originalname, "." );
	if ( $extpos === false ) {
		$extpos = strlen($originalname);
	}
	$extlen = strlen($originalname) - $extpos;
	$ext = strtolower( substr( $originalname, $extpos, $extlen ) );
	$name = substr( $originalname, 0, $extpos );
	

	if ( $ext != $allowed_ext ) {
		$badsubmit .= "Only $allowed_ext files are allowed.<br>";
	}
	
	if (file_exists($uploadfile)) {
    	$badsubmit .= "The file $originalname exists";
	}

	if ( !$badsubmit ) {
	
		switch ($_FILES['yourfile'] ['error']) {  
		case 1:
           print '<p> The file is bigger than this PHP installation allows.</p>';
           break;
    	case 2:
           print '<p> The file is bigger than this form allows.</p>';
           break;
    	case 3:
           print '<p> Only part of the file was uploaded.</p>';
           break;
    	case 4:
           print '<p> No file was uploaded.</p>';
           break;
 		
		}
	
		if (move_uploaded_file($_FILES['yourfile']['tmp_name'], $uploadfile)) {
		echo " Your file was valid and has been uploaded successfully. Thank you for your contribution.<br><br>";
		}
		
	} else {	
		
		echo "<div style=\"text-align:center;color:red;padding:10px;\"> $badsubmit </div>";
	}
} ?>



<form name="myform" enctype="multipart/form-data" method="post" action="<?PHP echo $_SERVER['PHP_SELF']; ?>" 
onsubmit="document.myform.submitbutton.disabled=true;return true;">

	<input type="hidden" name="MAX_FILE_SIZE" value="1000000" />
	<input type="file" name="yourfile" />
    	<input type="hidden" name="submitted" value="1 /">
	<input name="submitbutton" type="submit" value="Upload File" />

</form>