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Upload without overwriting existing filesWhen using HTML forms and PHP to upload files onto a website, there's always the danger that you'll overwrite existing files on the website. The following code checks if the uploaded file already exists and if so, prefixes the filename with a number and an underscore. Eg - "filename.txt" is renamed to "1_filename.txt". However, if "1_filename.txt" already exists, it increments the prefix until it finds an available filename. Eg - "2_filename.txt", "3_filename.txt", etc.
Note - I've also included a line of code that uses a regular expression to remove any non-web friendly characters from the filename. This isn't necessary but often useful when the uploaded files are meant to be viewed on the web.
Upload HTML form
<html>
<head>
<title>HTML Form for uploading image to server</title>
</head>
<body>
<form name="upload" method="post" action="uploadresults.php" enctype="multipart/form-data">
<input type="file" name="Image"><br>
<input type="submit" value="Upload Image">
</form>
</body>
</html>
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uploadresults.php
<?php
// rename file to remove web-unfriendly characters
$OriginalFilename = $FinalFilename = preg_replace('`[^a-z0-9-_.]`i','',$_FILES['image']['name']);
// rename file if it already exists by prefixing an incrementing number
$FileCounter = 1;
// loop until an available filename is found
while (file_exists( 'files/'.$FinalFilename ))
$FinalFilename = $FileCounter++.'_'.$OriginalFilename;
move_uploaded_file ( $_FILES['image']['tmp_name'], "files/$FinalFilename" ) or die ("Could not copy");
?>
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