This example shows how to set report variables on the server-side. First, you need to add the Stimulsoft libraries and scripts, required for the component to work. All code should be added in the <head> block of the HTML page:
<?php
require_once 'vendor/autoload.php';
?>

...

<?php
$js = new \Stimulsoft\StiJavaScript(\Stimulsoft\StiComponentType::Viewer);
$js->renderHtml();
?>

Next, in the <script> block, create and configure an event handler:
<script type="text/javascript">
<?php
$handler = new \Stimulsoft\StiHandler();
$handler->renderHtml();

Next, create the viewer with the necessary options and define the onPrepareVariables event. If value set to true, this event will be passed to the server-side event handler:
$options = new \Stimulsoft\Viewer\StiViewerOptions();
$options->appearance->fullScreenMode = true;

$viewer = new \Stimulsoft\Viewer\StiViewer($options);
$viewer->onPrepareVariables = true;

Next, create and load a report. The loadFile() method does not load the report object on the server side, it only generates the necessary JavaScript code. The report will be loaded into a JavaScript object on the client side:
$report = new \Stimulsoft\Report\StiReport();
$report->loadFile('reports/Variables.mrt');
$viewer->report = $report;
?>

Next, render the necessary JavaScript code and visual HTML part of the component, and close the </script> block. The rendered code will be placed inside the specified HTML element:
function onLoad() {
	<?php
	$viewer->renderHtml('viewerContent');
	?>
}
</script>

...

<body onload="onLoad();">
<div id="viewerContent"></div>
</body>

Finally, process report variables on the server-side in the onPrepareVariables() method. You can set the values of the report variables, the value types must match the original types. If the variable contained an expression, the already calculated value will be passed. The new values will be passed to the report generator. By default, all server-side events are located in the handler.php file:
$handler->onPrepareVariables = function ($args)
{
    /*
    $args->variables['VariableString']->value = 'Value from Server-Side';
    $args->variables['VariableDateTime']->value = '2020-01-31 22:00:00';
    $args->variables['VariableStringRange']->value->from = 'Aaa';
    $args->variables['VariableStringRange']->value->to = 'Zzz';
    $args->variables['VariableStringList']->value[0] = 'Test';
    $args->variables['VariableStringList']->value = ['1', '2', '2'];
    $args->variables['NewVariable'] = ['value' => 'New Value'];
    */

    // Values for 'Variables.mrt' report template
    if (count($args->variables) > 0) {
        $args->variables['Name']->value = 'Maria';
        $args->variables['Surname']->value = 'Anders';
        $args->variables['Email']->value = This email address is being protected from spambots. You need JavaScript enabled to view it.';
        $args->variables['Address']->value = 'Obere Str. 57, Berlin';
        $args->variables['Sex']->value = false;
        $args->variables['BirthDay']->value = '1982-03-20 00:00:00';
    }

    return StiResult::success();
};

In the screenshot below you can see the result of the sample code:

Setting Report Variables on the Server-Side

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