PHP清理标签函数，赶快来看

Question

<?php 
/**
 * 清理其他标签
 * @param $str
 * @return mixed
 */
function clearOtherTag($str){
    if(empty($str)) return false;
    $arr= array("n", "r", "rn","tt","t","&nbsp;");
    $str=str_replace($arr,"",tf($str));
    return $str;
}
?>

Answer 1

$str = preg_replace('/[nrt]/', '', $str); 

Answer 2

那就写两个

Answer 3

如果是两个换行符呢？