[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}

?>