Code Modernization: Comments: Use null coalescing operator instead of isset() ternaries.

Developed as a subset of #10654
Initially developed in #4886

Follow-up to [61403], [61433], [61432], [61431], [61430], [61429], [61424], [61404], [61403].

Props costdev, westonruter.
See #58874, #63430.


git-svn-id: https://develop.svn.wordpress.org/trunk@61434 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-admin/edit-comments.php

@@ -337,7 +337,7 @@
 		}
 
 		if ( $spammed > 0 ) {
-			$ids = isset( $_REQUEST['ids'] ) ? $_REQUEST['ids'] : 0;
+			$ids = $_REQUEST['ids'] ?? 0;
 
 			$messages[] = sprintf(
 				/* translators: %s: Number of comments. */
@@ -359,7 +359,7 @@
 		}
 
 		if ( $trashed > 0 ) {
-			$ids = isset( $_REQUEST['ids'] ) ? $_REQUEST['ids'] : 0;
+			$ids = $_REQUEST['ids'] ?? 0;
 
 			$messages[] = sprintf(
 				/* translators: %s: Number of comments. */

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

@@ -49,7 +49,7 @@ public function __construct( $args = array() ) {
 				'plural'   => 'comments',
 				'singular' => 'comment',
 				'ajax'     => true,
-				'screen'   => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen'   => $args['screen'] ?? null,
 			)
 		);
 	}
@@ -93,7 +93,7 @@ public function prepare_items() {
 			$mode = get_user_setting( 'posts_list_mode', 'list' );
 		}
 
-		$comment_status = isset( $_REQUEST['comment_status'] ) ? $_REQUEST['comment_status'] : 'all';
+		$comment_status = $_REQUEST['comment_status'] ?? 'all';
 
 		if ( ! in_array( $comment_status, array( 'all', 'mine', 'moderated', 'approved', 'spam', 'trash' ), true ) ) {
 			$comment_status = 'all';
@@ -144,7 +144,7 @@ public function prepare_items() {
 		);
 
 		$args = array(
-			'status'                    => isset( $status_map[ $comment_status ] ) ? $status_map[ $comment_status ] : $comment_status,
+			'status'                    => $status_map[ $comment_status ] ?? $comment_status,
 			'search'                    => $search,
 			'user_id'                   => $user_id,
 			'offset'                    => $start,

src/wp-includes/comment.php

@@ -2215,7 +2215,7 @@ function wp_filter_comment( $commentdata ) {
 	 *
 	 * @param string $comment_agent The comment author's browser user agent.
 	 */
-	$commentdata['comment_agent'] = apply_filters( 'pre_comment_user_agent', ( isset( $commentdata['comment_agent'] ) ? $commentdata['comment_agent'] : '' ) );
+	$commentdata['comment_agent'] = apply_filters( 'pre_comment_user_agent', ( $commentdata['comment_agent'] ?? '' ) );
 	/** This filter is documented in wp-includes/comment.php */
 	$commentdata['comment_author'] = apply_filters( 'pre_comment_author_name', $commentdata['comment_author'] );
 	/**
@@ -2333,7 +2333,7 @@ function wp_new_comment( $commentdata, $wp_error = false ) {
 	}
 
 	if ( ! isset( $commentdata['comment_agent'] ) ) {
-		$commentdata['comment_agent'] = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : '';
+		$commentdata['comment_agent'] = $_SERVER['HTTP_USER_AGENT'] ?? '';
 	}
 
 	/**
@@ -2632,7 +2632,7 @@ function wp_update_comment( $commentarr, $wp_error = false ) {
 
 	$filter_comment = false;
 	if ( ! has_filter( 'pre_comment_content', 'wp_filter_kses' ) ) {
-		$filter_comment = ! user_can( isset( $comment['user_id'] ) ? $comment['user_id'] : 0, 'unfiltered_html' );
+		$filter_comment = ! user_can( $comment['user_id'] ?? 0, 'unfiltered_html' );
 	}
 
 	if ( $filter_comment ) {