Поможем научить оформлять посты

[code]js script, CSS code, php code и.т.д[/сode]

$text = "<div>1</div>[\code\]<div>2</div>[\/code\]<strong>11</strong>[\code\]<strong>22</strong>[\/code\]<b>111</b>[\code\]<b>222</b>[\/code\]";
$text = htmlspecialchars($text);

$text = str_replace("[\code\]", "<code>", str_replace("[\/code\]", "</code>", $text) );

$pattern = "/<code>(.*?)<\/code>/";

preg_match_all($pattern, $text, $matches);

$matchesCont = count($matches[0]);

$i = 0;
foreach ($matches[0] as $matchesIn) {
    $matchesHtml = html_entity_decode($matches[0][$i]);
    
    $text = str_replace($matches[0][$i], $matchesHtml, $text);
    $i++;
}

echo $text;