How can file content be used to generate unique file names in PHP to avoid duplicates?

When generating unique file names in PHP to avoid duplicates, one approach is to use the content of the file itself to create a unique hash that can be appended to the file name. This ensures that even if two files have the same content, they will have different names based on their content.

// Read the content of the file
$fileContent = file_get_contents('example.txt');

// Generate a unique hash based on the file content
$uniqueHash = md5($fileContent);

// Append the unique hash to the original file name
$newFileName = 'example_' . $uniqueHash . '.txt';

// Rename the file with the new unique name
rename('example.txt', $newFileName);