Formatting: Loosen the type checking in _sanitize_text_fields().

[44618] added strict type checking to `_sanitize_text_fields()`, which has caused some compat issues with plugins.

We can loosen the type checking to only reject objects and arrays, and cast other types to string.

Props Nick_theGeek, pento.
Fixes #41450.



git-svn-id: https://develop.svn.wordpress.org/trunk@44731 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/formatting.php

@@ -5153,10 +5153,12 @@ function sanitize_textarea_field( $str ) {
  * @return string Sanitized string.
  */
 function _sanitize_text_fields( $str, $keep_newlines = false ) {
-	if ( ! is_string( $str ) ) {
+	if ( is_object( $str ) || is_array( $str ) ) {
 		return '';
 	}
 
+	$str = (string) $str;
+
 	$filtered = wp_check_invalid_utf8( $str );
 
 	if ( strpos( $filtered, '<' ) !== false ) {

tests/phpunit/tests/formatting/SanitizeTextField.php

@@ -97,6 +97,30 @@ class Tests_Formatting_SanitizeTextField extends WP_UnitTestCase {
 				array(),
 				'',
 			),
+			array(
+				array( 1, 2, 'foo' ),
+				'',
+			),
+			array(
+				new WP_Query,
+				'',
+			),
+			array(
+				2,
+				'2',
+			),
+			array(
+				false,
+				'',
+			),
+			array(
+				true,
+				'1',
+			),
+			array(
+				10.1,
+				'10.1',
+			),
 		);
 	}