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// $dir = path/to/directory/
function load_files( $dir ) {

    // Declare the results array to return.
    $results = array();
    
    // Scan the dir for files.
    $files = scandir( $dir );

    // Loop through the files in the directory.
    foreach ( $files as $file ) {
        // Exclude . and ..
        if ( ('.' === $file ) || ( '..' === $file ) ) {
            continue;
        }

        // Get the path to the file.
        $file = $dir . '/' . $file;

        // Get the file header info.
        $header = get_file_data( $file, array( 'Load' => 'Load' ) );

        // Get the file extension.
        $extension = substr( $file, strrpos( $file, '.' ) + 1 );

        // If 'Load' is true and the file is a PHP file.
        if ( 'true' === $header['Load'] && 'php' ===  $extension ) {
            $results[] = $file;
        }
    }

    // Return the results array.
    return $results;
}

/**
 * Load: true
 */

// Do some stuff.

// Get the file to include.
$files = load_files( 'path/to/directory/' );

// Loop through the files array.
foreach ( $files as $file ) {

    // Verify that the file exists.
    if ( file_exists( $file ) ) {

        // Include the file.
        include $file;
    }
}