$index_page = preg_replace("'<script[^>]*?>.*?</script>'smi", "<!-- js -->", $index_page);(经测试 很完美)
echo '<pre>';
echo '<xmp>';
preg_match('/<script type=.*?<//script>/ims',$str,$out);
print_r($out);
echo '</xmp>';
echo '</pre>';
echo preg_replace('/<script type=.*?<//script>/ims', ' ', $str);