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How to rename an uploaded file to give it a unique name with PHP
If you own an interactive website where your users can upload their files, you will need to insure that each file has a unique name that can be used as an identifier. One way to accomplish this task is to add a timestamp to the filename. Granted two users could upload a file with exactly the same name at exactly the same time. But unless you have a website with billions of visitors per day you should be safe. As you could probably guess the function to change a file's name goes under the name of rename(). The other function that we will use in the following example is file_exists(), simply to check if the file and path specified are indeed correct. <?php $tmp_name = "file.txt"; $new_name = "file".time().".txt"; if(file_exists($tmp_name)) { if(rename($tmp_name, $new_name)) { echo "<i>".$tmp_name."</i> has been renamed to: <i>".$new_name."</i>"; } } else { echo "The file <i>".$tmp_name."</i> could not be found."; } ?>
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