convert array to treeview in php

Question

How to convert array to treeview in php

Below is my array

Array
(
    [0] => Array
        (
            [efi] => Array
                (
                )
        )
    [1] => Array
        (
            [grub] => Array
                (
                    [0] => Array
                        (
                            [fonts] => Array
                                (
                                )
                        )
                    [1] => Array
                        (
                            [i386-pc] => Array
                                (
                                )
                        )
                    [2] => Array
                        (
                            [locale] => Array
                                (
                                )
                        )
                    [3] => Array
                        (
                            [x86_64-efi] => Array
                                (
                                )
                        )
                )
        )
)

I want output as treeview

• efi

• grub

and under grub I want

• fonts

• i386-pc

• locale

• x86_64-efi

I have used below code for same

function generateTreeMenu($dir_array, $parent = 0, $limit=0){
            if($limit > 1000) return '';
            $tree = '';
            $tree = '<ul>';
            for($i=0, $ni=count($dir_array); $i < $ni; $i++){
                if($dir_array[$i]['parent_id'] == $parent){
                    $tree .= '<li><a>';
                    $tree .= $dir_array[$i]['title'].'</a>';
                    $tree .= generatePageTree($dir_array, $dir_array[$i]['id'], $limit++);
                    $tree .= '</li>';
                }
            }
            $tree .= '</ul>';
            return $tree;
}

generateTreeMenu($dir_array);

it show warning Undefined property: stdClass::$parent_id in

Answer 1

Here is my solution, based on your post:

<?php
echo "<pre>";
$dir_array = array( array( "efi"  => array() ),
                    array( "grub" => array(
                                           array("fonts"      => array()),
                                           array("i386-pc"    => array()),
                                           array("locale"     => array()),
                                           array("x86_64-efi" => array())
                                          )
                         )
                  );
print_r($dir_array);
echo "</pre>\n";

function mygenerateTreeMenu($dir_array,$limit = 0)
{
    $key = '';
    if ($limit > 1000) return '';
    foreach ($dir_array as $key => $value)
    {
        if (!is_int($key))
        {
            $tree .= "<li>";
            $tree .= "<a>$key</a><ul>";
            $tree .= mygenerateTreeMenu($value,$limit++);
            $tree .= "</ul></li>\n";
        }
        else
        {
            $tree .= mygenerateTreeMenu($value,$limit++);
        }
    }
    return $tree;
}

echo "<ul>\n";
$tree = mygenerateTreeMenu($dir_array);
echo $tree;
echo "</ul>\n";
?>

I removed the $parent as I did not need it. Then because of the way your array is built, integer indexes are ignored. If you can modify your array, you could streamline it and remove integer indexes completely and treat is as a hash table. It would make the recursive code simpler.