// CKEditor adds <p> ...many spaces, tabs and others [quote=...] </p> at the beginning, and this </p> breaks quote
    // As a solution, replace that combination with [quote=...] before continuing to usual Quote code
    // http://de.php.net/manual/en/function.preg-replace.php
    // The same about end: replace <p> ...many spaces [/quote]</p> with just [/quote]
    $text =  preg_replace('#<p>[\s\n\r\t]*(\[/?quote.*?])\s*</p>#is', '${1}', $text);