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Asked: 2026-05-25T16:02:46+00:00

My db table looks like that. I’m trying to generate nav. menu from db

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My db table looks like that. I’m trying to generate nav. menu from db table. Here is my tables screenshot

enter image description here

I wanna get something like that

<li><a href="?page=1">Level 1</a>
  <ul>
   <li><a href="?page=2">Level2</a>
     <ul>
       <li><a href="?page=3">Level3</a></li> 
     </ul>
   </li>
  </ul>
</li>

And here is my recursive php function that generates nav function. 

<!doctype html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<?php
require 'core/includes/db.php';
function menu($parent, $level){
  global $db;
  $q = $db->query("select * from menu where parent = '$parent'");
  if($level > 0 && $q->num_rows > 0){
    echo '<ul>';
  }
  while($row=$q->fetch_object()){
    echo "<li>".$q->name."</li>"; (line 14)
    //display this level's children
    menu($q->id, $level+1); (line 16)
  }
  if($level > 0 &&  $q->num_rows > 0){
    echo '</ul>';
  }
}
echo '<ul>' . menu(0,0) . '</ul>'

?>

Actually it doesn’t generate anything. It works recursively and getting bunch of errors in php logs.

[15-Sep-2011 00:47:22] PHP Notice:  Undefined property: mysqli_result::$id in E:\Web Server\smiths-heimann.az\nav.php on line 16
[15-Sep-2011 00:47:22] PHP Notice:  Undefined property: mysqli_result::$name in E:\Web Server\smiths-heimann.az\nav.php on line 14

What’s wrong with my function? Please help to fix that

UPDATE
Final PHP CODE

<!doctype html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<?php
require 'core/includes/db.php';
function menu($parent, $level){
  global $db;
  $q = $db->query("select * from menu where parent = '$parent'");
  if($level > 0 && $q->num_rows > 0){
    echo '<ul>';
  }
while($row=$q->fetch_object()){
    echo "<li>";
    echo '<a href="?page=' . $row->id . '">' . $row->name . '</a>';
    //display this level's children
    menu($row->id, $level+1);
    echo "</li>\n";
}
  if($level > 0 &&  $q->num_rows > 0){
    echo '</ul>';
  }
}
echo '<ul>' . menu(0,0) . '</ul>'

?>


 </html>

OK. Now i’m getting what exactly what i want. Thank you Adam very much. But there are 3 pair of empty ‘s at the end of page. Why they are appearing? Please take a look

<!doctype html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

</head>

<li><a href="?page=1">Ana Səhifə</a></li> 
<li><a href="?page=2">Təftiş texnikası</a><ul><li><a href="?page=3">Təhlükə üzrə sıralanma</a></li> 
</ul></li> 
<li><a href="?page=4">Istifadə olunan texnologiyalar</a><ul><li><a href="?page=5">Qamma şüa spektroskopiyası</a></li> 
<li><a href="?page=6">Portativ Ion Spektrometri</a></li> 
<li><a href="?page=7">İnfra qırmızı</a></li> 
<li><a href="?page=8">Mikrodalğa</a></li> 
<li><a href="?page=9">Raman Spektroskopiyası</a></li> 
<li><a href="?page=10">Rentgen araşdırma sistemləri</a><ul><li><a href="?page=11">Məktub və Banderolların yoxlanışı</a></li> 
<li><a href="?page=12">HiTraX Texnologiyası</a></li> 
</ul></li> 
</ul></li> 
<ul></ul>



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1 Answer

  1. Editorial Team

    You have $q and $row mixed up in both lines 14 and 16. Each time your while loop runs, it puts the current object (from $q->fetch_object()) into $row. I’ve also updated my answer to better match your required output in the (updated) question

    while($row=$q->fetch_object()){
    echo "<li>";
    echo '<a href="?page=' . $row->id . '">' . $row->name . '</a>';
    //display this level's children
    menu($row->id, $level+1);
    echo "</li>";
}
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