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lib/functions/general.php

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+<?php
+/**
+ * Child Theme Library
+ *
+ * WARNING: This file is a part of the core Child Theme Library.
+ * DO NOT edit this file under any circumstances. Please use
+ * the functions.php file to make any theme modifications.
+ *
+ * @package   SEOThemes\ChildThemeLibrary\Functions
+ * @link      https://github.com/seothemes/child-theme-library
+ * @author    Thuan Bui
+ * @copyright Copyright © 2018 Thuan Bui
+ * @license   GPL-2.0+
+ */
+
+// If this file is called directly, abort.
+if ( ! defined( 'ABSPATH' ) ) {
+
+	die;
+
+}
+
+add_action( 'after_switch_theme', 'child_theme_display_excerpt_metabox' );
+/**
+ * Display excerpt metabox by default.
+ *
+ * The excerpt metabox is hidden by default on the page edit screen which can cause
+ * confusion for some users if they want to edit or remove the excerpt. To make
+ * it easier, we want to show the excerpt metabox by default. It only runs
+ * after switching theme so the current user's screen options are
+ * updated, allowing them to hide the metabox if not used.
+ *
+ * @since  1.0.0
+ *
+ * @return void
+ */
+function child_theme_display_excerpt_metabox() {
+
+	$user_id = get_current_user_id();
+
+	$post_types = array(
+		'page',
+		'post',
+		'portfolio',
+	);
+
+	foreach ( $post_types as $post_type ) {
+
+		$meta_key   = 'metaboxhidden_' . $post_type;
+		$prev_value = get_user_meta( $user_id, $meta_key, true );
+
+		if ( ! is_array( $prev_value ) ) {
+
+			$prev_value = array(
+				'genesis_inpost_seo_box',
+				'postcustom',
+				'postexcerpt',
+				'commentstatusdiv',
+				'commentsdiv',
+				'slugdiv',
+				'authordiv',
+				'genesis_inpost_scripts_box',
+			);
+
+		}
+
+		$meta_value = array_diff( $prev_value, array( 'postexcerpt' ) );
+
+		update_user_meta( $user_id, $meta_key, $meta_value, $prev_value );
+
+	}
+
+}