Hide Images in Wordpress

 Php for hide post content image

<?php

// WPCode: Remove <img> tags from post content and replace with alt text (if present).

add_filter('the_content', function($content) {

    // Use DOMDocument to avoid brittle regex

    libxml_use_internal_errors(true);

    $dom = new DOMDocument();

    // ensure proper encoding

    $dom->loadHTML('<?xml encoding="utf-8" ?>' . $content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

    $imgs = $dom->getElementsByTagName('img');

    // collect nodes to remove (can't remove while iterating live)

    $toRemove = [];

    foreach ($imgs as $img) {

        $alt = $img->getAttribute('alt');

        $placeholder_text = $alt ? htmlspecialchars($alt) : ''; // keep alt as visible text optionally

        // create a text node (or nothing) to replace the image

        $textNode = $dom->createTextNode($placeholder_text);

        $toRemove[] = ['img' => $img, 'text' => $textNode];

    }

    foreach ($toRemove as $item) {

        $img = $item['img'];

        $textNode = $item['text'];

        $img->parentNode->replaceChild($textNode, $img);

    }

    $html = $dom->saveHTML();

    // remove the fake xml encoding wrapper

    $html = preg_replace('/^<\?xml.*?\?>/','',$html);

    return $html;

});

?>

php code remove featured image

<?php

// Disable post thumbnails (stop theme from generating featured images)

add_filter('post_thumbnail_html', '__return_empty_string', 10, 5);

add_filter('get_the_post_thumbnail', '__return_empty_string', 10, 5);

?>

css code

/* Hide all <img> visually for non-logged-in users */

body:not(.logged-in) img { display: none !important; }

/* hide background images too (for many themes) */

body:not(.logged-in) [style*="background-image"], body:not(.logged-in) .has-background {

    background-image: none !important;

}