Ticket #1099: testcase.php

<?php

function wpautop($pee, $br = 1) {
        $pee = $pee . "\n"; // just to make things a little easier, pad the end
        $pee = preg_replace('|<br />\s*<br />|', "\n\n", $pee);
        // Space things out a little
        $pee = preg_replace('!(<(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|math|p|h[1-6])[^>]*>)!', "\n$1", $pee); 
        $pee = preg_replace('!(</(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|math|p|h[1-6])>)!', "$1\n", $pee);
        $pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines 
        $pee = preg_replace("/\n\n+/", "\n\n", $pee); // take care of duplicates
        $pee = preg_replace('/\n?(.+?)(?:\n\s*\n|\z)/s', "\t<p>$1</p>\n", $pee); // make paragraphs, including one at the end 
        $pee = preg_replace('|<p>\s*?</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace 
    $pee = preg_replace('!<p>\s*(</?(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|hr|pre|select|form|blockquote|math|p|h[1-6])[^>]*>)\s*</p>!', "$1", $pee); // don't pee all over a tag
        $pee = preg_replace("|<p>(<li.+?)</p>|", "$1", $pee); // problem with nested lists
        $pee = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $pee);
        $pee = str_replace('</blockquote></p>', '</p></blockquote>', $pee);
        $pee = preg_replace('!<p>\s*(</?(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|hr|pre|select|form|blockquote|math|p|h[1-6])[^>]*>)!', "$1", $pee);
        $pee = preg_replace('!(</?(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|math|p|h[1-6])[^>]*>)\s*</p>!', "$1", $pee); 
        if ($br) $pee = preg_replace('|(?<!<br />)\s*\n|', "<br />\n", $pee); // optionally make line breaks
        $pee = preg_replace('!(</?(?:table|thead|tfoot|caption|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|math|p|h[1-6])[^>]*>)\s*<br />!', "$1", $pee);
        $pee = preg_replace('!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)>)!', '$1', $pee);
        $pee = preg_replace('!(<pre.*?>)(.*?)</pre>!ise', " stripslashes('$1') .  clean_pre('$2')  . '</pre>' ", $pee);
        
        return $pee; 
}

$text="<div><p>Hello</p>\nWorld</div>";
echo wpautop($text);