Category subcategory tree view<\/b> provides a user-friendly way to list the parent and child categories. The category and their subcategory are easily separated by a tree structure. The categories tree view is always recommended to display an infinite level of categories and subcategories.<\/p>\n
In this tutorial, we will show you how to create dynamic category subcategory tree using PHP<\/b> and MySQL. The recursive category tree<\/b> is very useful to list n level categories in a dropdown. The example code helps you to build n level category subcategory dropdown in PHP. The dynamic categories data will be retrieved from the MySQL database and listed in a parent-child category tree format.<\/p>\nCreate Database Table<\/h2>\n
To store categories and subcategories, a table needs to be created in the database. The following SQL creates a The The The Use Category subcategory tree view provides a user-friendly way to list the parent and child categories. The category and their subcategory are easily separated by a tree structure. The categories tree view is always recommended to <\/p>\n","protected":false},"author":1,"featured_media":3150,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[4],"tags":[81,19,14],"class_list":["post-3148","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php","tag-dropdown","tag-mysql","tag-php","cat-4-id","has_thumb"],"yoast_head":"\ncategories<\/code> table in the MySQL database.<\/p>\nCREATE<\/span> TABLE<\/span> `categories<\/span>` (\r\n `id`<\/span> int<\/span>(11<\/span>) NOT NULL<\/span> AUTO_INCREMENT,\r\n `parent_id`<\/span> int<\/span>(11<\/span>) NOT NULL<\/span> DEFAULT '0'<\/span>,\r\n `name`<\/span> varchar<\/span>(100<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span>,\r\n `created`<\/span> datetime NOT NULL<\/span>,\r\n `modified`<\/span> datetime NOT NULL<\/span>,\r\n `status`<\/span> enum('1'<\/span>,'0'<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span> DEFAULT '1'<\/span> COMMENT '1:Active, 0:Inactive'<\/span>,\r\n PRIMARY KEY<\/span> (`id`<\/span>)\r\n) ENGINE=<\/span>InnoDB DEFAULT CHARSET=<\/span>utf8 COLLATE=<\/span>utf8_unicode_ci;\r\n<\/pre>\nparent_id<\/code> column specifies whether the category is parent or child. If parent_id is 0, it will be a parent category. Otherwise, it will be a child category and the ID is the parent of this category.<\/p>\nDatabase Configuration (dbConfig.php)<\/h2>\n
dbConfig.php<\/code> file is used to connect and select the database. Specify the database host ($dbHost<\/code>), username ($dbUsername<\/code>), password ($dbPassword<\/code>), and name ($dbName<\/code>) as per your MySQL credentials.<\/p>\n<?php
<\/span>\/\/ Database configuration
<\/span>$dbHost <\/span>= <\/span>\"localhost\"<\/span>;
<\/span>$dbUsername <\/span>= <\/span>\"root\"<\/span>;
<\/span>$dbPassword <\/span>= <\/span>\"root\"<\/span>;
<\/span>$dbName <\/span>= <\/span>\"codexworld\"<\/span>;
<\/span>\/\/ Create database connection
<\/span>$db <\/span>= new <\/span>mysqli<\/span>(<\/span>$dbHost<\/span>, <\/span>$dbUsername<\/span>, <\/span>$dbPassword<\/span>, <\/span>$dbName<\/span>);
<\/span>\/\/ Check connection
<\/span>if (<\/span>$db<\/span>-><\/span>connect_error<\/span>) {
die(<\/span>\"Connection failed: \" <\/span>. <\/span>$db<\/span>-><\/span>connect_error<\/span>);
}
<\/span>?><\/span><\/pre>\nPHP Recursive Function to Generate Parent\/Child Tree<\/h2>\n
categoryTree()<\/code> function generates an n level category subcategory tree using PHP. It will create the dropdown options for categories tree.<\/p>\n\n
$parent_id<\/code><\/b> – Optional. Specify the parent ID to get the child categories of this parent category.<\/li>\n$sub_mark<\/code><\/b> – Optional. Mark that will append at the beginning of the child category name.<\/li>\n<\/ul>\n<?php
<\/span>\/\/ Include the database configuration file
<\/span>require <\/span>'dbConfig.php'<\/span>;
function <\/span>categoryTree<\/span>(<\/span>$parent_id <\/span>= <\/span>0<\/span>, <\/span>$sub_mark <\/span>= <\/span>''<\/span>){
global <\/span>$db<\/span>;
<\/span>$query <\/span>= <\/span>$db<\/span>-><\/span>query<\/span>(<\/span>\"SELECT * FROM categories WHERE parent_id = <\/span>$parent_id<\/span> ORDER BY name ASC\"<\/span>);
if(<\/span>$query<\/span>-><\/span>num_rows <\/span>> <\/span>0<\/span>){
while(<\/span>$row <\/span>= <\/span>$query<\/span>-><\/span>fetch_assoc<\/span>()){
echo <\/span>'<option value=\"'<\/span>.<\/span>$row<\/span>[<\/span>'id'<\/span>].<\/span>'\">'<\/span>.<\/span>$sub_mark<\/span>.<\/span>$row<\/span>[<\/span>'name'<\/span>].<\/span>'<\/option>'<\/span>;
<\/span>categoryTree<\/span>(<\/span>$row<\/span>[<\/span>'id'<\/span>], <\/span>$sub_mark<\/span>.<\/span>'---'<\/span>);
}
}
}<\/span><\/pre>\nCategory Subcategory Dropdown in PHP<\/h2>\n
categoryTree()<\/code> function to build dynamic categories tree dropdown in PHP with MySQL.<\/p>\n<select<\/span> name<\/span>=\"category\"<\/span>>\r\n <?php categoryTree<\/span>(); <\/span>?><\/span>\r\n<\/select<\/span>>\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"