Administration: Allow filtering the current user's post count

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

@@ -101,6 +101,45 @@ public function __construct( $args = array() ) {
 			)
 		);
 
+		$user_id = get_current_user_id();
+
+		/**
+		 * Filters the number of posts authored by the current user.
+		 *
+		 * @since 7.1.0
+		 *
+		 * @param int    $user_posts_count Number of posts authored by the current user.
+		 * @param string $post_type         The post type.
+		 * @param int    $user_id           The current user ID.
+		 */
+		$this->user_posts_count = (int) apply_filters(
+			'user_posts_count',
+			$this->user_posts_count,
+			$post_type,
+			$user_id
+		);
+
+		/**
+		 * Filters the number of posts authored by the current user for a specific post type.
+		 *
+		 * The dynamic portion of the hook name, `$post_type`, refers to the post type.
+		 *
+		 * Possible hook names include:
+		 *
+		 *  - `user_posts_post_count`
+		 *  - `user_posts_page_count`
+		 *
+		 * @since 7.1.0
+		 *
+		 * @param int $user_posts_count Number of posts authored by the current user.
+		 * @param int $user_id           The current user ID.
+		 */
+		$this->user_posts_count = (int) apply_filters(
+			"user_posts_{$post_type}_count",
+			$this->user_posts_count,
+			$user_id
+		);
+
 		if ( $this->user_posts_count
 			&& ! current_user_can( $post_type_object->cap->edit_others_posts )
 			&& empty( $_REQUEST['post_status'] ) && empty( $_REQUEST['all_posts'] )

tests/phpunit/tests/admin/wpPostsListTable.php

@@ -596,4 +596,48 @@ public function test_checkbox_label_includes_no_title_excerpt() {
 
 		$this->assertStringContainsString( 'Select (no title) Hello world example excerpt.', $output );
 	}
+
+	/**
+	 * @ticket 47640
+	 *
+	 * @covers WP_Posts_List_Table::__construct
+	 * @covers WP_Posts_List_Table::get_views
+	 */
+	public function test_get_views_should_use_filtered_user_posts_count() {
+		global $avail_post_stati;
+
+		$user_id = self::factory()->user->create( array( 'role' => 'administrator' ) );
+		wp_set_current_user( $user_id );
+
+		$filter           = function ( $count, $post_type, $current_user_id ) use ( $user_id ) {
+			$this->assertSame( 0, $count );
+			$this->assertSame( 'page', $post_type );
+			$this->assertSame( $user_id, $current_user_id );
+
+			return 1;
+		};
+		$post_type_filter = function ( $count, $current_user_id ) use ( $user_id ) {
+			$this->assertSame( 1, $count );
+			$this->assertSame( $user_id, $current_user_id );
+
+			return 2;
+		};
+
+		add_filter( 'user_posts_count', $filter, 10, 3 );
+		add_filter( 'user_posts_page_count', $post_type_filter, 10, 2 );
+		$table = _get_list_table( 'WP_Posts_List_Table', array( 'screen' => 'edit-page' ) );
+		remove_filter( 'user_posts_count', $filter );
+		remove_filter( 'user_posts_page_count', $post_type_filter );
+
+		$avail_post_stati_backup = $avail_post_stati;
+		$avail_post_stati        = get_available_post_statuses();
+
+		$actual           = $table->get_views();
+		$avail_post_stati = $avail_post_stati_backup;
+
+		$this->assertSame(
+			'<a href="edit.php?post_type=page&#038;author=' . $user_id . '">Mine <span class="count">(2)</span></a>',
+			$actual['mine']
+		);
+	}
 }