$outputMode can be 'HTML', 'JSON' or 'ARRAY' $callbackFunction will receive html, json or a PHP array, and is called if a fatal error uncaught exception stops execution allowing graceful error screens or debug output.

The HTML output will be initially invisible - press Shift-Enter to show or hide output.

$plop = new \DanielJHarvey\PlopCatcher\Plop('HTML',function($html) {
    outputHTML($html);
});
$plop->enable();

// code that will be executed

// blah blah blah blah blah blah

// end of code

// output debugging info in chosen format
outputHTML($plop->output());

function outputHTML(html) {
    echo $html;
}

Other things

$plop->logComment($message);