// Allow unicode if a single high-bit character appears
$r0 = sprintf( '\x%02x', $ord0 );
$allowUnicode = true;
+ // @phan-suppress-next-line PhanParamSuspiciousOrder false positive
} elseif ( strpos( '-\\[]^', $d0 ) !== false ) {
$r0 = '\\' . $d0;
} else {