[php] 字串移除空白

$str = \" This line contains\\tliberal \\r\\n use of whitespace.\\n\\n\";

// 移除前後空白字

$str = trim($str);

// 移除重覆的空白

$str = preg_replace(\'/\\s(?=\\s)/\', \'\', $str);

// 移除非空白的間距變成一般的空白

$str = preg_replace(\'/[\\n\\r\\t]/\', \' \', $str);

// Echo out: \'This line contains liberal use of whitespace.\'

echo \"

{$str}

?>