Script Injector

Script Injector is a lightweight WordPress plugin that allows you to easily insert custom scripts (like Google Analytics, Facebook Pixel, Google Tag Manager, etc.) into your website's header, body, or footer.

Features

• Header Scripts: Insert scripts into the <head> section of your site.
• Body Scripts: Insert scripts immediately after the opening <body> tag.
• Footer Scripts: Insert scripts into the <footer> section of your site.
• Permission Check: Only users with manage_options capability can access the settings page.
• Clean Execution: Scripts are injected using standard WordPress hooks (wp_head, wp_body_open, wp_footer).

Performance

This plugin is engineered for minimal overhead:

• Admin/front-end code isolation: Admin code (settings, menus, rendering) is never loaded on public pages.
• Single DB query: Only one get_option call per request on the front-end.
• Early bail-out: If no scripts are configured, the plugin exits immediately — zero hooks registered.
• Conditional hooks: Only hooks for non-empty script fields are registered.
• Zero global functions: All logic uses closures, avoiding namespace pollution.

Installation

1. Upload the script-injector folder to the /wp-content/plugins/ directory.
2. Activate the plugin through the 'Plugins' menu in WordPress.
3. Access the settings via Settings → Scripts.

How to use

1. Go to the Scripts settings page.
2. Paste your script code (e.g., ``) into the corresponding field (Header, Body, or Footer).
3. Click "Save Changes".

Requirements

• WordPress 5.2+ (for wp_body_open support)
• PHP 7.0+