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I can't figure out what's wrong with this. The program works, but the duplication doesn't work. The error I get is : Notice: Undefined variable: SongToAdd in C:\ITEC315\htdocs\users\ramojumder0\Reinforcement Exercises\Ch. 6\R.E.6-1_SongOrganizer.php on line 64 Notice: Undefined variable: ExistingSongs in C:\ITEC315\htdocs\users\ramojumder0\Reinforcement Exercises\Ch. 6\R.E.6-1_SongOrganizer.php on line64 Warning: in_array() expects parameter 2 to be array, null given in C:\ITEC315\htdocs\users\ramojumder0\Reinforcement Exercises\Ch. 6\R.E.6-1_SongOrganizer.php on line 64 Warning: fopen(SongOrganizer/songs.txt): failed to open stream: No such file or directory in C:\ITEC315\htdocs\users\ramojumder0\Reinforcement Exercises\Ch. 6\R.E.6-1_SongOrganizer.php on line 72 There was an error saving your message! I bolded line 64 below, which is an if (in_array ) statement. line 64 is: if (in_array($SongToAdd, $ExistingSongs)) { echo "<p>The song you entered already exists!<br />\n"; echo "Your song was not added to the list.</p>"; } <?php if (isset($_GET['action'])) { if ((file_exists("SongOrganizer/songs.txt")) && (filesize("SongOrganizer/songs.txt") != 0)) { $SongArray = file("SongOrganizer/songs.txt"); switch ($_GET['action']) { case 'Remove Duplicates': $SongArray = array_unique($SongArray); $SongArray = array_values($SongArray); break; case 'Sort Ascending': sort($SongArray); break; case 'Shuffle': shuffle($SongArray); break; } // end of switch statement if (count($SongArray)>0) { $NewSongs = implode($SongArray); $SongStore = fopen("SongOrganizer/songs.txt", "wb"); if ($SongStore === false) echo "There was an error updating the song file\n"; else { fwrite($SongStore, $NewSongs); fclose($SongStore); } } else unlink("SongOrganizer/songs.txt"); } } if (isset($_POST['submit'])) { $SongToAdd = stripslashes($_POST['SongName']) . "\n"; $ExistingSongs = array(); if (file_exists("SongOrganizer/songs.txt") && filesize("SongOrganizer/songs.txt") > 0) { $ExistingSongs = file("SongOrganizer/songs.txt"); } } if (in_array($SongToAdd, $ExistingSongs)) { echo "<p>The song you entered already exists!<br />\n"; echo "Your song was not added to the list.</p>"; } else { $SongFile = fopen("SongOrganizer/songs.txt", "ab"); if ($SongFile === false) echo "There was an error saving your message!\n"; else { fwrite($SongFile, $SongToAdd); fclose($SongFile); echo "Your song has been added to the list.\n"; } } if ((!file_exists("SongOrganizer/songs.txt")) || (filesize("SongOrganizer/songs.txt") == 0)) echo "<p>There are no songs in the list.</p>\n"; else { $SongArray = file("SongOrganizer/songs.txt"); echo "<table border=\"1\" width=\"100%\" style=\"background-color:lightgray\">\n"; foreach ($SongArray as $Song) { echo "<tr>\n"; echo "<td>" . htmlentities($Song) . "</td>"; echo "</tr>\n"; } echo "</table>"; } ?> <!-- Display hyperlinks for the three functions in the switch statement (Sort Ascending, Remove Duplicates, and Shuffle) --> <p> <a href="SongOrganizer.php?action=Sort%20Ascending">Sort Song List</a><br /> <a href="SongOrganizer.php?action= Remove%20Duplicates">Remove Duplicate Songs</a><br /> <a href="SongOrganizer.php?action=Shuffle"> Randomize Song List</a><br /> </p> <!-- web form for entering new song names into the song list: --> <form action="SongOrganizer.php" method="post"> <p>Add a New Song</p> <p>Song Name: <input type="text" name="SongName" /></p> <p><input type="submit" name="submit" value="Add Song to List" /> <input type="reset" name="reset" value="Reset Song Name" /></p> </form> Any help would be appreciated!