как убрать теги с помощью str_replace или preg_replace (php)

strip_tags()

полный код удаления всего ненужного:

function phpdigCleanHtml($text) {
//htmlentities
global $spec;

//replace blank characters by spaces
$text = ereg_replace("[\r\n\t]+"," ",$text);

//extracts title
if (preg_match('/< *title *>(.*?)< *\/ *title *>/is',$text,$regs)) {
$title = trim($regs[1]);
}
else {
$title = "";
}

//delete content of head, script, and style tags
$text = eregi_replace("<head[^>]*>.*</head>"," ",$text);
//$text = eregi_replace("<script[^>]*>.*</script>"," ",$text); // more conservative
$text = preg_replace("/<script[^>]*?>.*?<\/script>/is"," ",$text); // less conservative
$text = eregi_replace("<style[^>]*>.*</style>"," ",$text);
// clean tags
$text = preg_replace("/<[\/\!]*?[^<>]*?>/is"," ",$text);
//$text = strip_tags($text,"<sub>");

// first case-sensitive and then case-insensitive
//tries to replace htmlentities by ascii equivalent
foreach ($spec as $entity => $char) {
$text = ereg_replace ($entity."[;]?",$char,$text);
$title = ereg_replace ($entity."[;]?",$char,$title);
}
//tries to replace htmlentities by ascii equivalent
foreach ($spec as $entity => $char) {
$text = eregi_replace ($entity."[;]?",$char,$text);
$title = eregi_replace ($entity."[;]?",$char,$title);
}

while (eregi('&#([0-9]{3});',$text,$reg)) {
$text = str_replace($reg[0],chr($reg[1]),$text);
}
while (eregi('&#x([a-f0-9]{2});',$text,$reg)) {
$text = str_replace($reg[0],chr(base_convert($reg[1],16,10)),$text);
}

//replace foo characters by space
$text = eregi_replace("[*{}()\"\r\n\t]+"," ",$text);
$text = eregi_replace("<[^>]*>"," ",$text);
$text = ereg_replace("(\r|\n|\r\n)"," ",$text);

// replace any stranglers by space
$text = eregi_replace("( -> | <- | > | < )"," ",$text);

//strip characters used in highlighting with no space
$text = str_replace("^#_","",str_replace("_#^","",$text));
$text = str_replace("@@@","",str_replace("@#@","",$text));

$text = ereg_replace("[[:space:]]+"," ",$text);

$retour['content'] = $text;
$retour['title'] = $title;
return $retour;
}