php过滤特殊字符、换行符、回车、前后空格、table缩进
$string // 字符串
$string = strip_tags( $string); //过滤特殊字符
$string = trim( $string); //过滤前后空格
$string = str_replace("\t","",$string); //过滤able缩进
$string = str_replace("\r","",$string); //过滤回车
$string = str_replace("\n","",$string); //过滤换行