MeGaPk/generator_categories.php

## generator_categories.php
<!-- Developed by Ivan Gaydamakin (vk.com/megapk) -->
<!-- License MIT -->
<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>Тег UL</title>
</head>
<body>
<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);

class GeneratorCategories
{
    private $filename;
    private $names;

    public function __construct($filename)
    {
        $this->names = [];
        $this->filename = $filename;
    }

    public function GenerateHtmlCategories()
    {
        $structure = $this->parseFileToStructure($this->filename);
        $categories = $this->parseStructureToCategories($structure);
        return $this->renderCategoriesToHtml($categories);
    }

    private function parseFileToStructure($filename)
    {
        $structure = [];
        foreach (file($filename) as $line) {
            $line = trim($line);
            if ($line == "")
                continue;
            list($id, $parent_id, $name) = explode("|", $line);
            $this->names[$id] = $name;
            $id = intval($id);
            $parent_id = intval($parent_id);
            if (empty($structure[$parent_id])) {
                $structure[$parent_id] = [];
            }
            $structure[$parent_id][$id] = [];
        }
        ksort($structure);
        return $structure;
    }


    private function fillParentCategory(array &$categories, $for_search_parent_id, $for_add_ids)
    {
        foreach ($categories as $category_id => &$category) {
            if ($category_id == $for_search_parent_id) {
                $category = $category + $for_add_ids;
            } else if (count($category) > 0) {
                $this->fillParentCategory($category, $for_search_parent_id, $for_add_ids);
            }
        }
    }

    function renderCategoriesToHtml(array $categories, $depth = 0, &$html = "")
    {
        foreach ($categories as $category_id => &$category) {
            if ($category_id != 0) {
                $html .= "<ul><li>";
                $html .= $this->names[$category_id];
            }
            if (count($category)) {
                $depth += 1;
                $this->renderCategoriesToHtml($category, $depth, $html);
            }
            if ($category_id != 0) {
                $html .= "</li></ul>";
            }
        }
        return $html;
    }

    private function parseStructureToCategories($structure)
    {
        $categories = [0 => $structure[0]];
        unset($structure[0]);
        foreach ($structure as $parent_id => $ids) {
            $this->fillParentCategory($categories, $parent_id, $ids);
        }
        return $categories;
    }
}


$generator = new GeneratorCategories("file.txt");
echo $generator->GenerateHtmlCategories();
?>
</body>
</html>
	<!-- Developed by Ivan Gaydamakin (vk.com/megapk) -->
	<!-- License MIT -->
	<!DOCTYPE HTML>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Тег UL</title>
	</head>
	<body>
	<?php
	error_reporting(E_ALL);
	ini_set('display_errors', 1);

	class GeneratorCategories
	{
	private $filename;
	private $names;

	public function __construct($filename)
	{
	$this->names = [];
	$this->filename = $filename;
	}

	public function GenerateHtmlCategories()
	{
	$structure = $this->parseFileToStructure($this->filename);
	$categories = $this->parseStructureToCategories($structure);
	return $this->renderCategoriesToHtml($categories);
	}

	private function parseFileToStructure($filename)
	{
	$structure = [];
	foreach (file($filename) as $line) {
	$line = trim($line);
	if ($line == "")
	continue;
	list($id, $parent_id, $name) = explode("\|", $line);
	$this->names[$id] = $name;
	$id = intval($id);
	$parent_id = intval($parent_id);
	if (empty($structure[$parent_id])) {
	$structure[$parent_id] = [];
	}
	$structure[$parent_id][$id] = [];
	}
	ksort($structure);
	return $structure;
	}


	private function fillParentCategory(array &$categories, $for_search_parent_id, $for_add_ids)
	{
	foreach ($categories as $category_id => &$category) {
	if ($category_id == $for_search_parent_id) {
	$category = $category + $for_add_ids;
	} else if (count($category) > 0) {
	$this->fillParentCategory($category, $for_search_parent_id, $for_add_ids);
	}
	}
	}

	function renderCategoriesToHtml(array $categories, $depth = 0, &$html = "")
	{
	foreach ($categories as $category_id => &$category) {
	if ($category_id != 0) {
	$html .= "<ul><li>";
	$html .= $this->names[$category_id];
	}
	if (count($category)) {
	$depth += 1;
	$this->renderCategoriesToHtml($category, $depth, $html);
	}
	if ($category_id != 0) {
	$html .= "</li></ul>";
	}
	}
	return $html;
	}

	private function parseStructureToCategories($structure)
	{
	$categories = [0 => $structure[0]];
	unset($structure[0]);
	foreach ($structure as $parent_id => $ids) {
	$this->fillParentCategory($categories, $parent_id, $ids);
	}
	return $categories;
	}
	}


	$generator = new GeneratorCategories("file.txt");
	echo $generator->GenerateHtmlCategories();
	?>
	</body>
	</html>