General: Fix code quality issues which were identified by static analysis.

This fixes minor issues that could cause PHP notices under the right conditions, and fixes some general incorrectness.

Props jrf, hellofromTonya for review

See #52217


git-svn-id: https://develop.svn.wordpress.org/trunk@51850 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/edit.php

@@ -154,7 +154,7 @@ if ( $doaction ) {
 			}
 			$sendback = add_query_arg( 'untrashed', $untrashed, $sendback );
 
-			remove_filter( 'wp_untrash_post_status', 'wp_untrash_post_set_previous_status', 10, 3 );
+			remove_filter( 'wp_untrash_post_status', 'wp_untrash_post_set_previous_status', 10 );
 
 			break;
 		case 'delete':

src/wp-admin/includes/class-wp-list-table.php

@@ -207,12 +207,14 @@ class WP_List_Table {
 	 * @since 4.0.0
 	 *
 	 * @param string $name Property to check if set.
-	 * @return bool Whether the property is set.
+	 * @return bool Whether the property is a back-compat property and it is set.
 	 */
 	public function __isset( $name ) {
 		if ( in_array( $name, $this->compat_fields, true ) ) {
 			return isset( $this->$name );
 		}
+
+		return false;
 	}
 
 	/**
@@ -313,6 +315,8 @@ class WP_List_Table {
 		if ( isset( $this->_pagination_args[ $key ] ) ) {
 			return $this->_pagination_args[ $key ];
 		}
+
+		return 0;
 	}
 
 	/**

src/wp-includes/class-wp-http-curl.php

@@ -307,7 +307,7 @@ class WP_Http_Curl {
 		);
 
 		// Handle redirects.
-		$redirect_response = WP_HTTP::handle_redirects( $url, $parsed_args, $response );
+		$redirect_response = WP_Http::handle_redirects( $url, $parsed_args, $response );
 		if ( false !== $redirect_response ) {
 			return $redirect_response;
 		}

src/wp-includes/class-wp-http-streams.php

@@ -470,6 +470,6 @@ class WP_Http_Streams {
  * @since 2.7.0
  * @deprecated 3.7.0 Please use WP_HTTP::request() directly
  */
-class WP_HTTP_Fsockopen extends WP_HTTP_Streams {
+class WP_HTTP_Fsockopen extends WP_Http_Streams {
 	// For backward compatibility for users who are using the class directly.
 }

src/wp-includes/post.php

@@ -5506,6 +5506,8 @@ function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
 	if ( $foundid ) {
 		return get_post( $foundid, $output );
 	}
+
+	return null;
 }
 
 /**
@@ -5563,6 +5565,8 @@ function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' )
 	if ( $page ) {
 		return get_post( $page, $output );
 	}
+
+	return null;
 }
 
 /**

src/wp-includes/widgets.php

@@ -1739,11 +1739,12 @@ function wp_widget_rss_process( $widget_rss, $check_feed = true ) {
 	$show_summary = isset( $widget_rss['show_summary'] ) ? (int) $widget_rss['show_summary'] : 0;
 	$show_author  = isset( $widget_rss['show_author'] ) ? (int) $widget_rss['show_author'] : 0;
 	$show_date    = isset( $widget_rss['show_date'] ) ? (int) $widget_rss['show_date'] : 0;
+	$error        = false;
+	$link         = '';
 
 	if ( $check_feed ) {
-		$rss   = fetch_feed( $url );
-		$error = false;
-		$link  = '';
+		$rss = fetch_feed( $url );
+
 		if ( is_wp_error( $rss ) ) {
 			$error = $rss->get_error_message();
 		} else {

src/wp-includes/widgets/class-wp-widget-tag-cloud.php

@@ -53,6 +53,8 @@ class WP_Widget_Tag_Cloud extends WP_Widget {
 			}
 		}
 
+		$default_title = $title;
+
 		$show_count = ! empty( $instance['count'] );
 
 		$tag_cloud = wp_tag_cloud(

src/wp-mail.php

@@ -77,6 +77,9 @@ for ( $i = 1; $i <= $count; $i++ ) {
 	$content_transfer_encoding = '';
 	$post_author               = 1;
 	$author_found              = false;
+	$post_date                 = null;
+	$post_date_gmt             = null;
+
 	foreach ( $message as $line ) {
 		// Body signal.
 		if ( strlen( $line ) < 3 ) {