Filesystem API: Avoid a PHP notice in `WP_Filesystem_Direct::owner()` and `::group()` methods and their `WP_Filesystem_SSH2` counterparts.

Although not officially documented in the PHP manual, `posix_getpwuid()` and `posix_getgrgid()` can return `false` in some circumstances.

Props logig.
Fixes #50373.
Built from https://develop.svn.wordpress.org/trunk@48031


git-svn-id: http://core.svn.wordpress.org/trunk@47798 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-filesystem-direct.php

@@ -223,6 +223,9 @@ class WP_Filesystem_Direct extends WP_Filesystem_Base {
 			return $owneruid;
 		}
 		$ownerarray = posix_getpwuid( $owneruid );
+		if ( ! $ownerarray ) {
+			return false;
+		}
 		return $ownerarray['name'];
 	}
 
@@ -257,6 +260,9 @@ class WP_Filesystem_Direct extends WP_Filesystem_Base {
 			return $gid;
 		}
 		$grouparray = posix_getgrgid( $gid );
+		if ( ! $grouparray ) {
+			return false;
+		}
 		return $grouparray['name'];
 	}
 

wp-admin/includes/class-wp-filesystem-ssh2.php

@@ -402,6 +402,9 @@ class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
 			return $owneruid;
 		}
 		$ownerarray = posix_getpwuid( $owneruid );
+		if ( ! $ownerarray ) {
+			return false;
+		}
 		return $ownerarray['name'];
 	}
 
@@ -434,6 +437,9 @@ class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
 			return $gid;
 		}
 		$grouparray = posix_getgrgid( $gid );
+		if ( ! $grouparray ) {
+			return false;
+		}
 		return $grouparray['name'];
 	}
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-48028';
+$wp_version = '5.5-alpha-48031';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.