livesearch.php

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<?php
/* @var $request \Elgg\Http\Request */
$request = elgg_extract('request', $vars);

// pass all input params (GET & POST) into $vars
$input_params = $request->getParams();
$ignored_inputs = ['view', '_route'];
foreach ($input_params as $name => $value) {
    if (in_array($name, $ignored_inputs)) {
        continue;
    }
    
    // request can contain wrong value
    $value = get_input($name, $value);
    
    // set request param in $vars, but don't overrule already set values
    // extract with false in order to replace empty value in $vars with request data
    $vars[$name] = elgg_extract($name, $vars, $value, false);
}

$match_on = elgg_extract('match_on', $vars);

// livesearch will result in a json response
elgg_set_viewtype('json');

if (!elgg_view_exists("resources/livesearch/$match_on")) {
    throw new \Elgg\PageNotFoundException();
}

echo elgg_view("resources/livesearch/$match_on", $vars);