Multiple Category Selection Widget

4.0.0

• New: Gutenberg block — “Multi-Category Filter” available in the block editor
• New: Lightweight CSS file with clean BEM-style classes
• Removed: PHP sessions — all search state now carried in URL query parameters
• Removed: jQuery dependency — AJAX chaining rewritten in vanilla JavaScript
• Fixed: AJAX chaining now sends the nonce (was broken since v3.2.0)
• Fixed: Shortcode now returns output instead of echoing (proper shortcode behavior)
• Fixed: Rewrite rules no longer flushed on every page load (only on activation)
• Fixed: AJAX handler uses wp_send_json_success() instead of print/die
• Changed: Admin settings page uses dedicated slug instead of FILE
• Changed: All redirect calls use wp_safe_redirect()
• Changed: Requires WordPress 6.0+
• Security: Tightened input validation with sanitize_key(), absint(), whitelist checks

3.2.0

• PHP 8.x compatibility: replaced create_function() with anonymous function
• Security: ABSPATH guards, nonce verification, input sanitization, output escaping
• Replaced get_bloginfo(‘url’) with home_url()

3.1.6

• Tested in WP 4.3.1
• Updated widget implementation to PHP 5 methodology

3.1.5

• Tested in WP 3.8
• Fixed overriding the navigation menu WP script

3.1.4

• Tested in WP 3.7
• Fixed media library files missing after plugin search

3.1.3

• Tested in WP 3.5.2
• Fixed AND/IN rewrite rules

3.1.1

• Extensive testing on any/all search
• Reverted select box layout

3.1

• Created admin settings page
• Added shortcode [mcsw]
• AJAX on/off toggle
• Form display above results toggle

3.0

• Support for multiple forms on a page
• Shortcode support
• Rewrite rule fixes

2.4

• Rewrite rules only flush on activation

2.3

• Fixed variable checking
• Added title ordering

2.2

• AJAX chained select boxes

2.1

• WordPress 2.8+ widget class with multiple instances

2.0

• Fixed permalink issues
• All-in-one-SEO and WP Smart Sort compatibility

1.0

• First release