Free Code Collection

A function for easily uploading files. This function will automatically generate a new file name so that files are not overwritten.

Arguments: $file_id- The name of the input field contianing the file.
$folder – The folder to which the file should be uploaded to – it must be writable. OPTIONAL
$types – A list of comma(,) seperated extensions that can be uploaded. If it is empty, anything goes OPTIONAL
Returns : This is somewhat complicated – this function returns an array with two values…
The first element is randomly generated filename to which the file was uploaded to.
The second element is the status – if the upload failed, it will be ‘Error : Cannot upload the file ‘name.txt’.’ or something like that
Sample
PHP Part

 PHP | 
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if($_FILES['image']['name']) {
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list($file,$error) = upload('image','uploads/','jpeg,gif,png');
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if($error) print $error;
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}
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 HTML | 
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<form action="" method="post" enctype="multipart/form-data">
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<input type="file" name="image" /><input type="submit" value="Upload" name="action" />
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</form
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 PHP | 
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function  upload($file_id, $folder="", $types="") {
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	if(!$_FILES[$file_id]['name'])
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		return array('','No file specified');
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	$file_title = $_FILES[$file_id]['name'];
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	//Get file extension
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	$ext_arr = split("\.",basename($file_title));
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	$ext = strtolower($ext_arr[count($ext_arr)-1]);
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	$filelog = "filename".$ext_arr[0]." ext.".$ext." original".$file_title;
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	//Get the last extension
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	//Not really uniqe - but for all practical reasons, it is
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	$uniqer = substr(md5(uniqid(rand(),1)),0,5);
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	//$file_name =$uniqer.'_'.$file_title;
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	//$file_name =$ext_arr[0].'_'.$uniqer.'.'.$ext;
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	$file_name =$ext_arr[0].'_'.$uniqer.'.jpg';
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	//Get Unique Name
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	$all_types = explode(",",strtolower($types));
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	if($types) {
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		if(in_array($ext,$all_types));
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		else {
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			$result = "'".$_FILES[$file_id]['name']."' is not a valid file.";
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			//Show error if any.
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			return array('',$result);
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		}
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	}
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	//Where the file must be uploaded to
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	if($folder)
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		$folder .= '/';
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	//Add a '/' at the end of the folder
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	$uploadfile = $folder . $file_name;
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	$result = '';
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	//Move the file from the stored location to the new location
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	if (!move_uploaded_file($_FILES[$file_id]['tmp_name'], $uploadfile)) {
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		$result = "Cannot upload the file '".$_FILES[$file_id]['name']."'";
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		//Show error if any.
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		if(!file_exists($folder)) {
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			$result .= " : Folder don't exist.";
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		}
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		elseif(!is_writable($folder)) {
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			$result .= " : Folder not writable.";
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		}
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		elseif(!is_writable($uploadfile)) {
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			$result .= " : File not writable.";
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		}
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		$file_name = '';
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	}
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	else {
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		if(!$_FILES[$file_id]['size']) {
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			//Check if the file is made
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			@unlink($uploadfile);	//Delete the Empty file
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			$file_name = '';
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			$result = "Empty file found - please use a valid file."; //Show the error message
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		} else {
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			chmod($uploadfile,0777);//Make it universally writable.
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		}
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	}
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	return array($file_name,$result);
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}