php怎么去掉字符串空行

本文操作环境：windows7系统、PHP7.1版、DELL G3电脑

php怎么去掉字符串空行?

php去掉html中的空行、空白函数

function DeleteHtml($str){  
                    $str = trim($str);  
                    $str = ereg_replace("\t","",$str);  
                    $str = ereg_replace("\r\n","",$str);  
                    $str = ereg_replace("\r","",$str);  
                    $str = ereg_replace("\n","",$str);  
                    return trim($str);  
                }