Jump to content
Larry Ullman's Book Forums

Recommended Posts


i'm using your recursive function in my web app.

but the problem is the infinite loop.

in bills of material, user can miskatenly input parent id under child id in some depths below.


so, i'd like to stop the recursive function in 10th depth.


this is, my question is how do i exit from the recursive.


i tried a few hours but failed.


thanks in advance.



<?php # Script 1.3 - view_tasks.php
/*  This page shows all existing tasks.
 *  A recursive function is used to show the
 *  tasks as nested lists, as applicable.
// Function for displaying a list.
// Receives one argument: an array.
function make_list($parent) {
    // Need the main $tasks array:
    global $tasks;
    echo '<ol>'; // Start an ordered list.
    // Loop through each subarray:
 foreach ($parent as $task_id => $todo) {
     // Display the item:
     echo "<li>$todo";
        // Check for subtasks:
  if (isset($tasks[$task_id])) {
      // Call this function again:
        echo '</li>'; // Complete the list item.
    } // End of FOREACH loop.
    echo '</ol>'; // Close the ordered list.
} // End of make_list() function.
// Connect to the database:
$dbc = mysqli_connect('localhost', 'username', 'password', 'test');
// Retrieve all the uncompleted tasks:
$q = 'SELECT task_id, parent_id, task FROM tasks WHERE date_completed="0000-00-00 00:00:00" ORDER BY parent_id, date_added ASC';
$r = mysqli_query($dbc, $q);
// Initialize the storage array:
$tasks = array();
// Loop through the results:
while (list($task_id, $parent_id, $task) = mysqli_fetch_array($r, MYSQLI_NUM)) {
    // Add to the array:
    $tasks[$parent_id][$task_id] =  $task;
// For debugging:
//echo '<pre>' . print_r($tasks,1) . '</pre>';
// Send the first array element
// to the make_list() function:


Link to comment
Share on other sites


  • Create New...