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<?php |
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/** |
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* @copyright Copyright (c) 2015 Nobuo Kihara |
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* @license https://github.com/softark/creole/blob/master/LICENSE |
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* @link https://github.com/softark/creole#readme |
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*/ |
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namespace softark\creole\inline; |
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// work around https://github.com/facebook/hhvm/issues/1120 |
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defined('ENT_HTML401') || define('ENT_HTML401', 0); |
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/** |
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* Adds links and images as well as url markers. |
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* |
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*/ |
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trait LinkTrait |
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{ |
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/** |
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* @var string the base url of the wiki which is used for the internal links. |
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*/ |
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public $wikiUrl = ''; |
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/** |
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* @var array a list of external wikis referenced in this document. |
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* An element in the list should be a key-value pair in which key is the wiki name |
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* and the value is the url of it. |
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*/ |
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public $externalWikis = []; |
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/** |
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* @var string regular expression pattern to detect an url |
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* This does not allow '[' and ']' in the url. |
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*/ |
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private $_urlRegexp = <<< REGEXP |
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/(?(R) # in case of recursion match parentheses |
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\(((?>[^\s()]+)|(?R))*\) |
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| # else match a link |
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^(https?|ftp):\/\/(([^\s\[\]\<\>()]+)|(?R))+(?<![\[\]\<\>\.,:;\'"!\?\s]) |
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)/x |
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REGEXP; |
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/** |
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* Parses urls and adds auto linking feature. |
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* @marker http |
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* @marker ftp |
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*/ |
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protected function parseUrl($markdown) |
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{ |
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View Code Duplication |
if (!in_array('parseLink', $this->context) && preg_match($this->_urlRegexp, $markdown, $matches)) { |
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return [ |
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['autoUrl', $matches[0]], |
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strlen($matches[0]) |
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]; |
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} |
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return [['text', substr($markdown, 0, 6)], 6]; |
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} |
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protected function renderAutoUrl($block) |
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{ |
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$href = htmlspecialchars($block[1], ENT_COMPAT | ENT_HTML401, 'UTF-8'); |
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$text = htmlspecialchars(urldecode($block[1]), ENT_NOQUOTES | ENT_SUBSTITUTE, 'UTF-8'); |
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return "<a href=\"$href\">$text</a>"; |
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} |
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/** |
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* Parses urls starting with a tilde (~) into a plain text. |
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* @marker ~http |
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* @marker ~ftp |
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*/ |
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protected function parseEscapedUrl($markdown) |
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{ |
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$text = substr($markdown, 1); |
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View Code Duplication |
if (preg_match($this->_urlRegexp, $text, $matches)) { |
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return [ |
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['text', $matches[0]], |
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strlen($matches[0]) + 1 |
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]; |
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} |
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return [['text', substr($markdown, 0, 4)], 4]; |
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} |
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/** |
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* Parses a link: [[ ... ]] |
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* @marker [[ |
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*/ |
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protected function parseLink($markdown) |
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{ |
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if (!in_array('parseLink', array_slice($this->context, 1)) && preg_match('/^\[\[(.*?)\]\]/', $markdown, $matches)) { |
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// '[[link]] |
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View Code Duplication |
if (preg_match('/^(.+?)\|(.*)$/', $matches[1], $parts)) { |
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// 'link|text' pattern |
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$url = $parts[1]; |
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$text = ($parts[2] == '') ? $parts[1] : $parts[2]; |
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} else { |
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// 'link' only pattern |
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$url = $matches[1]; |
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$text = $matches[1]; |
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} |
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if (!preg_match('/^(https?|ftp):\/\//', $url)) { |
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// not an external link, i.e., a wiki link |
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if (preg_match('/^(.*):(.*)$/', $url, $urlMatches)) { |
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// inter wiki link |
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$extWiki = $urlMatches[1]; |
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if (isset($this->externalWikis[$extWiki])) { |
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$url = $this->externalWikis[$extWiki] . urlencode($urlMatches[2]); |
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} else { |
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return [ |
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[ |
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'text', |
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$matches[0], |
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], |
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strlen($matches[0]) |
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]; |
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} |
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} else { |
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// internal link |
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$url = $this->wikiUrl . urlencode($url); |
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} |
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} |
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return [ |
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[ |
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'link', |
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'text' => $this->parseInline($text), |
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'url' => $url, |
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], |
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strlen($matches[0]) |
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]; |
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View Code Duplication |
} else { |
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// remove all starting [ markers to avoid next one to be parsed as link |
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$result = '[['; |
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$i = 2; |
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while (isset($markdown[$i]) && $markdown[$i] == '[') { |
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$result .= '['; |
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$i++; |
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} |
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return [['text', $result], $i]; |
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} |
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} |
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/** |
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* Parses an image: {{ ... }} |
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* @marker {{ |
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*/ |
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protected function parseImage($markdown) |
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{ |
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if (preg_match('/^\{\{(.*?)\}\}/', $markdown, $matches)) { |
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// '{{image}} |
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View Code Duplication |
if (preg_match('/^(.+?)\|(.*)$/', $matches[1], $parts)) { |
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// 'image|text' pattern |
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$url = $parts[1]; |
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$text = ($parts[2] == '') ? $parts[1] : $parts[2]; |
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} else { |
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// 'image' only pattern |
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$url = $matches[1]; |
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$text = $matches[1]; |
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} |
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if ($url == $text) { |
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if (preg_match('/([^\/]+\.(jpe?g|png|gif))/i', $url, $fileMatches)) { |
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$text = $fileMatches[1]; |
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} |
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} |
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return [ |
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[ |
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'image', |
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'text' => $text, |
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'url' => $url, |
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], |
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strlen($matches[0]) |
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]; |
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View Code Duplication |
} else { |
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// remove all starting [ markers to avoid next one to be parsed as link |
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$result = '{{'; |
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$i = 2; |
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while (isset($markdown[$i]) && $markdown[$i] == '{') { |
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$result .= '['; |
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$i++; |
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} |
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return [['text', $result], $i]; |
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} |
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} |
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protected function renderUrl($block) |
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{ |
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$url = htmlspecialchars($block[1], ENT_COMPAT | ENT_HTML401, 'UTF-8'); |
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$text = htmlspecialchars(urldecode($block[1]), ENT_NOQUOTES | ENT_SUBSTITUTE, 'UTF-8'); |
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return "<a href=\"$url\">$text</a>"; |
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} |
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protected function renderLink($block) |
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{ |
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return '<a href="' . htmlspecialchars($block['url'], ENT_COMPAT | ENT_HTML401, 'UTF-8') . '"' |
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. '>' . $this->renderAbsy($block['text']) . '</a>'; |
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} |
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protected function renderImage($block) |
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{ |
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return '<img src="' . htmlspecialchars($block['url'], ENT_COMPAT | ENT_HTML401, 'UTF-8') . '"' |
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. ' alt="' . htmlspecialchars($block['text'], ENT_COMPAT | ENT_HTML401 | ENT_SUBSTITUTE, 'UTF-8') . '"' |
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. ($this->html5 ? '>' : ' />'); |
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} |
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abstract protected function parseInline($text); |
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abstract protected function renderAbsy($absy); |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: