GtkScintilla::brace_highlight

void brace_highlight(int pos1, int pos2);

Set positions inside the text to be showed in brace mode. Brace colors and fonts indentify characters like "{", "(" and "["

$brace_pos = $scintilla->get_current_pos();
$char = $scintilla->get_char_at($brace_pos);
if (($char == '{') or ($char == '}')) // or...
    $other_pos = $scintilla->brace_match($brace_pos);

$scintilla->brace_highlight($brace_pos, $other_pos);