bool unlink ( string filename [, resourcecontext ] )

<?php
   file = "/PhpProject/php/sample.txt";
   if(!unlink(file)) {
      echo ("Error deleting file");
   } else {
      echo ("Deletedfile successfully");
   }
?>

Deleted /PhpProject/php/sample.txt successfully

<?php
   fh = fopen("/PhpProject/test.html", "a");
   fwrite(fh, "<h1> Hello world! </h1>");
   fclose($fh);

   unlink("/PhpProject1/test.html");
?>

file deleted succcessfully