1:

$text = preg_replace("/\[quote\](.*)\[\/quote\]/siU","<div class=\"forum_quote\">\\1</div>",$text);

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7:

$anzahl = substr_count($text, "[quote]");
for($i = 1; $i <= $anzahl; $i++) {
$text = preg_replace("/\[quote\](.*)\[\/quote\]/siU", "<div class=\"forum_quote\">\\1</div>", $text);
}
$anzahl = "";