Ticket #59818: 59818.diff

src/wp-includes/formatting.php

@@ -4961 +4961 @@
                         break;
 
                 case 'ping_sites':
-                        $value = explode( "\n", $value );
+                        if ( is_string( $value ) ) {
+                                $value = explode( "\n", $value );
+                        } else {
+                                $value = array();
+                        }
+
                         $value = array_filter( array_map( 'trim', $value ) );
                         $value = array_filter( array_map( 'sanitize_url', $value ) );
                         $value = implode( "\n", $value );

tests/phpunit/tests/option/sanitizeOption.php

@@ -44 +44 @@
                         array( 'date_format', 'F j, Y', 'F j, <strong>Y</strong>' ),
                         array( 'ping_sites', 'http://rpc.pingomatic.com/', 'http://rpc.pingomatic.com/' ),
                         array( 'ping_sites', "http://www.example.com\nhttp://example.org", "www.example.com \n\texample.org\n\n" ),
+                        array( 'ping_sites', '', null ),
                         array( 'gmt_offset', '0', 0 ),
                         array( 'gmt_offset', '1.5', '1.5' ),
                         array( 'gmt_offset', '', null ),