It is a good practice to check if the file exists already before creating that file. Learn a proper function here.

File existence checking

If you want to check whether a file exists, you should use file exists PHP function.

Syntax:
file_exists($path),
where $path - path to the file, on the local machine.

Example:
$TmpName=/images/file1.jpg;
file_exists($DOCUMENT_ROOT.$TmpName);
where
$DOCUMENT_ROOT - PHP environment variable, containing the root path to website documents on the server machine, and
$TmpName - path to the file you checking relative to website root path.

Here is the code that checks file named file1.jpg in "images" folder

$File="file1.jpg";
$TmpName="/images/".$File;
if(file_exists($DOCUMENT_ROOT.$TmpName)){
   print "<b> Oops! The file named
   $File already exists</b>";
} else{
   print "<b> File named
   $File does not exist </b>";
}

When you are usually have to check a file for existence:
1. Often when you have a script, generating file for output. Though you think there can't be any problems with duplicate filenames, it is a good practice to check file every time when your script attempts to create it.
2.Often you need it when you write an upload file script. And it is better to generate filename in the script, not allowing user to type the name of uploaded file.
3. When you copying files from one place to another, it is a good practice to have checks every time you create new file.
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