PHP Recursive array looping and formatting

Question

I have some PHP code I've been working on for a good few days now. I'm trying to generate a formatted list of rules from a flat array. I got help here before on how to turn the flat array into a tree array, but I'm having difficulty writing a recursive function that can go through it and successfully break it down at points at such depths where I'd like the rules to be members of an unordered list from the markup that gets printed.

<?php 
$data = array(
    '0'        => 'Introduction',
    '4'        => 'General',
    '4.1'      => 'Chat',
    '4.1.1'    => 'Do',
    '4.1.1.9'  => 'This',
    '4.1.1.10' => 'That',
    '4.1.1.11' => 'Other',
);

$struct = array(
    'children' => array()
);

foreach ($data as $ruleID => $content)
{
    $parent =& $struct;
    foreach (explode('.', $ruleID) as $val)
    {
        if (!isset($parent['children'][$val]))
        {
        $parent['children'][$val] = array(
                'content' => '',
                'children' => array()
            );
        }
        $parent =& $parent['children'][$val];
    }
    $parent['content'] = $content;
}


$out = '';
$rules = array_pop($struct);
format_rule($rules);
var_dump($rules);
echo $out;

function format_rule($arr, $depth=0)
{
    global $out;
    echo "depth: $depth\n";
    foreach($arr as $key => $val)
    {
        switch($depth)
        {
            case 0:
                $out .= '<h1>'.$val['content']."</h1><br />\n";
                break;
            case 1:
                $out .= '<h2>'.$val['content']."</h2><br />\n";
                break;
            case 2:
                $out .= '<h3>'.$val['content']."</h3><br />\n";
                break;
            default:
                $out .= '<li>'.$val['content']."</li>\n";
                break;
        }
        if(isset($val['children']) && count($val['children']) > 0)
        {
            if($depth > 2)
            {
                $out .= '<ul>';
                format_rule($val['children'], ++$depth);
                $out .= '</ul>';
            }
            else
            {
                format_rule($val['children'], ++$depth);
            }
        }
    }
}

The output at the moment is:

<h1>Introduction</h1><br />
<h1>General</h1><br />
<h2>Chat</h2><br />
<h3>Do</h3><br />
<li>This</li><br />
<li>That</li><br />
<li>Other</li><br />

Which is great, except from my code I'm pretty sure the section under 'Do' should have a <ul> around it.

Stewie · Accepted Answer · 2012-03-14 21:59:46Z

2

change your code to :

if($depth >= 2)

note: remember the count starts at 0, not 1.

answered Mar 14, 2012 at 21:59

Stewie

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1 Comment

deed02392 Over a year ago

I feel robbed that I caved and came here when I was so close.

Taha Paksu · Accepted Answer · 2012-03-14 22:21:06Z

2

Try this:

<?php 
$data = array(
    '0'        => 'Introduction',
    '4'        => 'General',
    '4.1'      => 'Chat',
    '4.1.1'    => 'Do',
    '4.1.1.9'  => 'This',
    '4.1.1.10' => 'That',
    '4.1.1.11' => 'Other',
);

function get_level($key){
    return count(explode(".",$key));
}

function set_tag(&$array,$key,$item,&$ul_started){
    $level = get_level($key);
    switch($level){
        case 1:
        case 2:
        case 3:
            if($ul_started){
                $array[$key] = "</ul><h".$level.">".$item."</h".$level."><br>";
                $ul_started=false;
            }else{
                $array[$key] = "<h".$level.">".$item."</h".$level."><br>";
            }
        break;
        default:
            if(!$ul_started){
                $array[$key] = "<ul><li><strong>".$item."</strong></li><br>";
                $ul_started=true;
            }else{
                $array[$key] = "<li><strong>".$item."</strong></li><br>";
            }
        break;
    }
}

$ul_started = false;

foreach($data as $key=>$item){
    set_tag($data,$key,$item,$ul_started);
}

if($ul_started){
    $keys = array_keys($data);
    $data[$keys[count($data)-1]] .= "</ul>";
}

echo implode("",$data);
?>

answered Mar 14, 2012 at 22:21

Taha Paksu

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2 Comments

deed02392 Over a year ago

+1 for effort, but just changing depth > to >= and then giving default <li> tags makes my code work just how I wanted. Subsequent depths get embedded in more <ul> which is perfect.

Taha Paksu Over a year ago

yea, I just wanted to challenge myself.

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