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Block content change when it is a first block

  • I have some custom blocks (m-txt, m-img, m-gallery). Each of the blocks has their own field title.

    When I render an HTML code for all blocks I pus title into <h2></h2> tags.

    I would like to choose the first block on the page and replace <h2>$title</h2> it with <h1><?php echo get_post_title()?></h1> (post title override custom title) tags.How can I detect that this is a first block and make any changes on it?

    Example module render code:

    <?php
    $title = get_field('title');
    $html = '';
    
    if(!empty($title)){
        $html .= '<section class="block">';
        $html .= '<div class="container module__container">';
        $html .= '<div class="module__header">';
        $html .= '<h2>' . $title . '</h2>';
        $html .= '</div>';
        $html .= '</div>';
        $html .= '</section>';
    }
    
    echo $html;
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