Delete a file in php in Php

<?php

/**
 * function to delete a file
 * @param string $file_name  File name to delete
 * @return $result
 */ 
function deleteFile($file_name) {
  $result = false;
  // check if file exists
  if (file_exists($file_name)) {
    // delete the file
    $result = unlink($file_name);
  }
  // return the result
  return $result;
}

//example
$result = deleteFile('test.txt');

//output
echo $result; //true or false