How to fix php regular expression?

Question

PHP

hello, help me correct the regular expression
there is such a code

if ($section) {
            $section = cleanStr($section);
            $section_cond = "and ( sections like '0' or sections REGEXP '\\[\\[:<:\\]\\]" . $section . "\\[\\[:>:\\]\\]' )";

Sample

{banner->getTemplateBanners p1='listings2' p2=$section p3=$cat p4=$bloc assign='array_banners'}

this code displays a banner between articles, more precisely divides the articles in half and displays between them,
please tell me how to make this same banner appear after 1 article or after 2, for example, I don’t understand how to do it

Answer 1

In the article output loop, add an iterator and, for example, check whether the iterator is even or odd and add the necessary