Php write file as file,file2,file3 etc

<?php
$name = 'folder/file.txt';
$actual_name = pathinfo($name,PATHINFO_FILENAME);
$original_name = $actual_name;
$extension = pathinfo($name, PATHINFO_EXTENSION);
$i = 2;
while(file_exists('folder/'.$actual_name.".".$extension))
{
$actual_name = (string)$original_name.$i;
$name = $actual_name.".".$extension;
$i++;
}
$myfile = fopen('folder/'.$name, "w") or die("Unable to open file!");
$txt = "This is content to write";
fwrite($myfile, $txt);
?>

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