Introduce a binary-safe wrapper for strlen() and use it in seems_utf8(), utf8_uri_encode(), and wp_read_image_metadata().

Use binary-safe POMO_Reader::strlen() in MO::export_to_file_handle().

fixes #28162.

git-svn-id: https://develop.svn.wordpress.org/trunk@28806 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -4404,6 +4404,24 @@ function reset_mbstring_encoding() {
 	mbstring_binary_safe_encoding( true );
 }
 
+/**
+ * Uses a binary-safe encoding to get the length of a string in bytes if func_overload is enabled.
+ *
+ * @see mbstring_binary_safe_encoding()
+ *
+ * @since 4.0.0
+ *
+ * @param string $string The string to get the length of.
+ * @return int The length of the string in bytes.
+ */
+function mbstring_binary_safe_strlen( $string ) {
+	mbstring_binary_safe_encoding();
+	$length = strlen( $string );
+	reset_mbstring_encoding();
+
+	return $length;
+}
+
 /**
  * Alternative to filter_var( $var, FILTER_VALIDATE_BOOLEAN )
  *