roi-theme/wp-content/themes/apus-theme/inc/adsense-delay.php

<?php
/**
 * AdSense Delay Loading Functionality
 *
 * Delays the loading of AdSense scripts until user interaction or timeout
 * to improve initial page load performance.
 *
 * @package Apus_Theme
 * @since 1.0.0
 */

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Delay AdSense scripts by intercepting output buffer
 *
 * This function starts output buffering and replaces AdSense scripts
 * with delayed versions when the page is rendered.
 */
function apus_delay_adsense_scripts() {
    // Only run on frontend
    if (is_admin()) {
        return;
    }

    // Check if AdSense delay is enabled in theme options
    $delay_enabled = get_theme_mod('apus_adsense_delay_enabled', true);

    if (!$delay_enabled) {
        return;
    }

    // Start output buffering
    ob_start('apus_replace_adsense_scripts');
}
add_action('template_redirect', 'apus_delay_adsense_scripts', 1);

/**
 * Replace AdSense scripts with delayed versions
 *
 * This function processes the HTML output and replaces standard AdSense
 * script tags with delayed loading versions.
 *
 * @param string $html The HTML content to process
 * @return string Modified HTML with delayed AdSense scripts
 */
function apus_replace_adsense_scripts($html) {
    // Only process if there's actual AdSense content
    if (strpos($html, 'pagead2.googlesyndication.com') === false &&
        strpos($html, 'adsbygoogle.js') === false) {
        return $html;
    }

    // Pattern to match AdSense script tags
    $patterns = array(
        // Match async script tags for AdSense
        '/<script\s+async\s+src=["\']https:\/\/pagead2\.googlesyndication\.com\/pagead\/js\/adsbygoogle\.js[^"\']*["\']\s*(?:crossorigin=["\']anonymous["\'])?\s*><\/script>/i',

        // Match script tags without async
        '/<script\s+src=["\']https:\/\/pagead2\.googlesyndication\.com\/pagead\/js\/adsbygoogle\.js[^"\']*["\']\s*(?:crossorigin=["\']anonymous["\'])?\s*><\/script>/i',

        // Match inline adsbygoogle.push scripts
        '/<script>\s*\(adsbygoogle\s*=\s*window\.adsbygoogle\s*\|\|\s*\[\]\)\.push\(\{[^}]*\}\);\s*<\/script>/is',
    );

    // Replace async AdSense scripts with delayed versions
    $replacements = array(
        // Replace async script tag with data attribute for delayed loading
        '<script type="text/plain" data-adsense-script src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" crossorigin="anonymous"></script>',

        // Replace non-async script tag
        '<script type="text/plain" data-adsense-script src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js" crossorigin="anonymous"></script>',

        // Replace inline push scripts with delayed versions
        '<script type="text/plain" data-adsense-push>$0</script>',
    );

    // First pass: replace script tags
    $html = preg_replace($patterns[0], $replacements[0], $html);
    $html = preg_replace($patterns[1], $replacements[1], $html);

    // Second pass: replace inline push calls
    $html = preg_replace_callback(
        '/<script>\s*\(adsbygoogle\s*=\s*window\.adsbygoogle\s*\|\|\s*\[\]\)\.push\(\{[^}]*\}\);\s*<\/script>/is',
        function($matches) {
            return '<script type="text/plain" data-adsense-push>' . $matches[0] . '</script>';
        },
        $html
    );

    // Add a comment to indicate processing occurred
    if (defined('WP_DEBUG') && WP_DEBUG) {
        $html = str_replace('</body>', '<!-- AdSense scripts delayed by Apus Theme --></body>', $html);
    }

    return $html;
}

/**
 * Add inline script to initialize delayed AdSense
 *
 * This adds a small inline script that marks AdSense as ready to load
 * after the adsense-loader.js has been enqueued.
 */
function apus_add_adsense_init_script() {
    $delay_enabled = get_theme_mod('apus_adsense_delay_enabled', true);

    if (!$delay_enabled || is_admin()) {
        return;
    }

    ?>
    <script>
    // Initialize AdSense delay flag
    window.apusAdsenseDelayed = true;
    </script>
    <?php
}
add_action('wp_head', 'apus_add_adsense_init_script', 1);

/**
 * Register customizer settings for AdSense delay
 *
 * @param WP_Customize_Manager $wp_customize Theme Customizer object
 */
function apus_adsense_delay_customizer($wp_customize) {
    // Add Performance section if it doesn't exist
    if (!$wp_customize->get_section('apus_performance')) {
        $wp_customize->add_section('apus_performance', array(
            'title'    => __('Performance Settings', 'apus-theme'),
            'priority' => 130,
        ));
    }

    // Add setting for AdSense delay
    $wp_customize->add_setting('apus_adsense_delay_enabled', array(
        'default'           => true,
        'sanitize_callback' => 'apus_sanitize_checkbox',
        'transport'         => 'refresh',
    ));

    // Add control for AdSense delay
    $wp_customize->add_control('apus_adsense_delay_enabled', array(
        'label'       => __('Delay AdSense Loading', 'apus-theme'),
        'description' => __('Delay AdSense scripts until user interaction to improve page load speed.', 'apus-theme'),
        'section'     => 'apus_performance',
        'type'        => 'checkbox',
    ));
}
add_action('customize_register', 'apus_adsense_delay_customizer');

/**
 * Sanitize checkbox input
 *
 * @param bool $checked Whether the checkbox is checked
 * @return bool Sanitized value
 */
function apus_sanitize_checkbox($checked) {
    return (isset($checked) && $checked === true || $checked === '1') ? true : false;
}