Cofem/lib/inliner.php

<?php

function inlineLocalStylesFromHref($inputString) {
    // Define the regular expression pattern to match <link> tags with href attribute for CSS files
    $pattern = '/<link[^>]*?\srel=["\']?stylesheet["\'].*?\shref=["\']?\/(.*?)["\'][^>]*?>/i';

    // Use preg_replace_callback to replace matched link tags with inline styles
    $outputString = preg_replace_callback($pattern, function($match) {
        // Extract the href attribute value
        $href = $match[1];

        $cssFilePath = $_SERVER['DOCUMENT_ROOT'] . '/' . $href;
        echo "from $cssFilePath";

        // Get the content of the local CSS file
        $cssContent = file_get_contents($cssFilePath);

        // Get the directory where the CSS file is located
        $cssDir = dirname($cssFilePath);

        // Replace relative paths in the CSS content to be relative to the CSS file's directory
        $cssContent = preg_replace_callback('/url\(["\']?(\/.*?|.*?)["\']?\)/i', function($urlMatch) use ($cssDir) {
            // Extract the URL value
            $url = $urlMatch[1];

            // Combine with the CSS file's directory to create an absolute path
            $absolutePath = $cssDir . '/' . $url;

            // Make the path relative to the CSS file's directory
            $relativePath = ltrim(substr($absolutePath, strlen($_SERVER['DOCUMENT_ROOT'])), '/');

            // Create the updated url() declaration
            $updatedUrlDeclaration = 'url("' . $relativePath . '")';

            return $updatedUrlDeclaration;
        }, $cssContent);

        // Create an inline style tag with the modified CSS content
        return "<style>\n{$cssContent}\n</style>";
    }, $inputString);

    return $outputString;
}

function inlineScriptFromSrc($inputString) {
    // Define the regular expression pattern to match <script> tags with src attribute
    $pattern = '/<script.*?src=["\']\/(.*?)["\'].*?>\s*<\/script>/i';

    // Use preg_replace_callback to replace matched script tags with inline script
    $outputString = preg_replace_callback($pattern, function($match) {
        // Extract the src attribute value
        $src = $match[1];

        // Get the content of the JavaScript file
        $jsContent = file_get_contents($_SERVER['DOCUMENT_ROOT'] . '/' . $src);

        // Escape the JavaScript content for inline use
        $escapedJsContent = htmlspecialchars($jsContent, ENT_QUOTES, 'UTF-8');

        // Create an inline script with the escaped content
        return "<script>\n{$escapedJsContent}\n</script>";
    }, $inputString);

    return $outputString;
}