[Charter]

Like this...

// template file and style - checks to see that template is set to a valid value
if (isset($_REQUEST['template_demo'])) { $template_demo = $_REQUEST['template_demo']; }
$templates_array = array('black.html','bluegrey.html','corporate.html','green.html','grey.html','lightgreen.html','linear.html','newspaper.html','phpdig.html','simple.html','terminal.html','yellow.html','gaagle.html');
if(isset($template_demo) && in_array($template_demo, $templates_array)) {
    $template = "$relative_script_path/templates/$template_demo";
} else {
    $template = "$relative_script_path/templates/phpdig.html";
}

$template = "$relative_script_path/templates/linear.html";
// template file and style - alternatively force the template value
// $template = "$relative_script_path/templates/phpdig.html";
// if using array, set $template = "array";
// if using classic, set $template = "classic";

// now set $template_demo to clean $template filename or empty string
if (($template != "array") && ($template != "classic")) {
    $template_demo = substr($template,strrpos($template,"/")+1); // get filename.ext from $template variable
} else {
    $template_demo = "";
}

Or like this...

// template file and style - checks to see that template is set to a valid value
if (isset($_REQUEST['template_demo'])) { $template_demo = $_REQUEST['template_demo']; }
$templates_array = array('black.html','bluegrey.html','corporate.html','green.html','grey.html','lightgreen.html','linear.html','newspaper.html','phpdig.html','simple.html','terminal.html','yellow.html','gaagle.html');
if(isset($template_demo) && in_array($template_demo, $templates_array)) {
    $template = "$relative_script_path/templates/linear.html";
} else {
    $template = "$relative_script_path/templates/linear.html";
}

// template file and style - alternatively force the template value
// $template = "$relative_script_path/templates/phpdig.html";
// if using array, set $template = "array";
// if using classic, set $template = "classic";

// now set $template_demo to clean $template filename or empty string
if (($template != "array") && ($template != "classic")) {
    $template_demo = substr($template,strrpos($template,"/")+1); // get filename.ext from $template variable
} else {
    $template_demo = "";
}