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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@@ -610,7 +610,7 @@ function install_blog( $blog_id, $blog_title = '' ) {
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// Cast for security.
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$blog_id = (int) $blog_id;
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require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
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require_once ABSPATH . 'wp-admin/includes/upgrade.php';
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$suppress = $wpdb->suppress_errors();
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if ( $wpdb->get_results( "DESCRIBE {$wpdb->posts}" ) ) {
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@@ -677,7 +677,7 @@ function install_blog_defaults( $blog_id, $user_id ) {
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_deprecated_function( __FUNCTION__, 'MU' );
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require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
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require_once ABSPATH . 'wp-admin/includes/upgrade.php';
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$suppress = $wpdb->suppress_errors();
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