$str="i am a book\n\n\n\n\nmoth";
//去除所有的空格和换行符
echo preg_replace("/[\s]{2,}/","",$str).'';
//去除多余的空格和换行符,只保留一个
echo preg_replace("/([\s]{2,})/","\\1",$str); |
$str="i am a book\n\n\n\n\nmoth";
//去除所有的空格和换行符
echo preg_replace("/[\s]{2,}/","",$str).'';
//去除多余的空格和换行符,只保留一个
echo preg_replace("/([\s]{2,})/","\\1",$str);