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run code in 200+ php & hhvm versions
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<?php $string = '[a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="344747585151010c745359555d581a575b59"]'; function bb_parse($string) { $tags = 'b|i|size|color|center|quote|url|img'; while (preg_match_all('`\[('.$tags.')=?(.*?)\](.+?)\[/\1\]`', $string, $matches)) foreach ($matches[0] as $key => $match) { list($tag, $param, $innertext) = array($matches[1][$key], $matches[2][$key], $matches[3][$key]); switch ($tag) { case 'b': $replacement = "<strong>$innertext</strong>"; break; case 'i': $replacement = "<em>$innertext</em>"; break; case 'size': $replacement = "<span style=\"font-size: $param;\">$innertext</span>"; break; case 'color': $replacement = "<span style=\"color: $param;\">$innertext</span>"; break; case 'center': $replacement = "<div class=\"centered\">$innertext</div>"; break; case 'quote': $replacement = "<blockquote>$innertext</blockquote>" . $param? "<cite>$param</cite>" : ''; break; case 'url': $replacement = '<a href="' . ($param? $param : $innertext) . "\">$innertext</a>"; break; case 'img': list($width, $height) = preg_split('`[Xx]`', $param); $replacement = "<img src=\"$innertext\" " . (is_numeric($width)? "width=\"$width\" " : '') . (is_numeric($height)? "height=\"$height\" " : '') . '/>'; break; case 'video': $videourl = parse_url($innertext); parse_str($videourl['query'], $videoquery); if (strpos($videourl['host'], 'youtube.com') !== FALSE) $replacement = '<embed src="http://www.youtube.com/v/' . $videoquery['v'] . '" type="application/x-shockwave-flash" width="425" height="344"></embed>'; if (strpos($videourl['host'], 'google.com') !== FALSE) $replacement = '<embed src="http://video.google.com/googleplayer.swf?docid=' . $videoquery['docid'] . '" width="400" height="326" type="application/x-shockwave-flash"></embed>'; break; } $string = str_replace($match, $replacement, $string); } return $string; } echo bb_parse($string);
based on HeIrl
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0alpha1
[a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="344747585151010c745359555d581a575b59"]