ParsedownDetails.php

<?php
class ParsedownDetails extends ParsedownExtra {
	function __construct() {
		$this->BlockTypes['¡'][] = 'Details';
		parent::__construct();
	}


	// Details
	protected function blockDetails($Line) {
		if (preg_match('/^([¡]{3,})[ ]*(.+)?[ ]*$/', $Line['text'], $matches)) {
			$summary = [
				'name' => 'summary',
				'text' => 'Open spoiler by clicking',
			];

			if (isset($matches[2])) {
				$summary['text'] = $matches[2];
			}

			$Block = [
			'char' => $Line['text'][0],
			'element' => [
				'name' => 'details',
				'handler' => 'elements',
				'text' => [$summary, ''],
				],
			];

			return $Block;
		}
	}


	protected function blockDetailsContinue($Line, $Block) {
		if (isset($Block['complete'])) {
			return;
		}
		if (isset($Block['interrupted'])) {
			$Block['element']['text'][1] .= "\n";
			unset($Block['interrupted']);
		}
		if (preg_match('/^!{3,}[ ]*$/', $Line['text'])) {
			$Block['element']['text'][1] = substr($Block['element']['text'][1], 1);
			$Block['complete'] = true;
			return $Block;
		}
		$Block['element']['text'][1] .= "\n".$Line['body'];

		return $Block;
	}


	protected function blockDetailsComplete($Block) {
		$Block['element']['text'][1] = $this->text($Block['element']['text'][1]);
		return $Block;
	}
}