Code Modernization: Replace dirname( __FILE__ ) calls with __DIR__ magic constant.
This avoids the performance overhead of the function call every time `dirname( __FILE__ )` was used instead of `__DIR__`. This commit also includes: * Removing unnecessary parentheses from `include`/`require` statements. These are language constructs, not function calls. * Replacing `include` statements for several files with `require_once`, for consistency: * `wp-admin/admin-header.php` * `wp-admin/admin-footer.php` * `wp-includes/version.php` Props ayeshrajans, desrosj, valentinbora, jrf, joostdevalk, netweb. Fixes #48082. Built from https://develop.svn.wordpress.org/trunk@47198 git-svn-id: http://core.svn.wordpress.org/trunk@46998 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@@ -376,10 +376,10 @@ class WP_Customize_Section {
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}
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/** WP_Customize_Themes_Section class */
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require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php' );
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require_once ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php';
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/** WP_Customize_Sidebar_Section class */
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require_once( ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php' );
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require_once ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php';
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/** WP_Customize_Nav_Menu_Section class */
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require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php' );
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require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php';
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