Text collaboration system using php mysql and html -

i trying create parent child text collaboration system , parent text can have more 1 child. instance :

text 1 can edited , have edit 2 , text 1 can edited again , have edit 3 edit 3 can edited , become edit 4 , on.

below script have allows user edit original text input : index.php

<?php     include 'includes/connection.php';      $query = "select * branches";       $result1 = mysql_query($query) or die(mysql_error());      while($person = mysql_fetch_array($result1)) {  //as long there data, output data             $id = $person['id'];             $query2 = "select * branchesedit (parent_id = '$id' )";             $result2 =  mysql_query($query2) or die(mysql_error());               echo "<h3>" . $person['names'] . "</h3>";             echo "<p>" . $person['lyrics'] . "</p>";             echo "<a href=\"modify.php?id=" . $person['id'] . "\">modify song</a>";             echo "<span> </span>";             echo "<a href=\"delete.php?id=" . $person['id'] . "\">delete song</a>";                   while($row2 = mysql_fetch_array($result2)){                     echo "<h3>" . $row2['name'] . "</h3>";                     echo "<p>" . $row2['lyricupdate'] . "</p>";             }     } ?> 

modify.php

<?php     if(isset($_post['submit'])) {         $query = "select id branches id = $_get[id]";          mysql_query("insert branchesedit(`ids`, `name`, `lyricupdate`, `parent_id`)             values ('','$_post[inputname]', '$_post[ta]', '$_post[id]')") or die(mysql_error());          echo "song has been modified";         header("location: index.php");       } ?>