+endif;
+
+/**
+ * Internal compat function to mimic mb_strlen().
+ *
+ * Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
+ * For $encoding === UTF-8, the `$str` input is expected to be a valid UTF-8 byte
+ * sequence. The behavior of this function for invalid inputs is undefined.
+ *
+ * @ignore
+ * @since 4.2.0
+ *
+ * @param string $str The string to retrieve the character length from.
+ * @param string|null $encoding Optional. Character encoding to use. Default null.
+ * @return int String length of `$str`.
+ */
+function _mb_strlen( $str, $encoding = null ) {
+ if ( null === $encoding ) {
+ $encoding = get_option( 'blog_charset' );
+ }
+
+ /*
+ * The solution below works only for UTF-8, so in case of a different charset
+ * just use built-in strlen().
+ */
+ if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
+ return strlen( $str );
+ }
+
+ if ( _wp_can_use_pcre_u() ) {
+ // Use the regex unicode support to separate the UTF-8 characters into an array.
+ preg_match_all( '/./us', $str, $match );
+ return count( $match[0] );
+ }
+
+ $regex = '/(?:
+ [\x00-\x7F] # single-byte sequences 0xxxxxxx
+ | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
+ | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
+ | [\xE1-\xEC][\x80-\xBF]{2}
+ | \xED[\x80-\x9F][\x80-\xBF]
+ | [\xEE-\xEF][\x80-\xBF]{2}
+ | \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
+ | [\xF1-\xF3][\x80-\xBF]{3}
+ | \xF4[\x80-\x8F][\x80-\xBF]{2}
+ )/x';
+
+ // Start at 1 instead of 0 since the first thing we do is decrement.
+ $count = 1;
+ do {
+ // We had some string left over from the last round, but we counted it in that last round.
+ $count--;
+
+ /*
+ * Split by UTF-8 character, limit to 1000 characters (last array element will contain
+ * the rest of the string).
+ */
+ $pieces = preg_split( $regex, $str, 1000 );
+
+ // Increment.
+ $count += count( $pieces );
+
+ // If there's anything left over, repeat the loop.
+ } while ( $str = array_pop( $pieces ) );
+
+ // Fencepost: preg_split() always returns one extra item in the array.
+ return --$count;