从字符串中删除多个换行符和多个空格 - Trim multiple line breaks and multiple spaces off a string?

Trim multiple line breaks and multiple spaces off a string?

如何修剪多个换行符?

例如,

$text ="similique sunt in culpa qui officia

deserunt mollitia animi, id est laborum et dolorum fuga. 

Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore
"

我试过这个答案，但它不工作的情况下，我认为，

$text = preg_replace("/'n+/","'n",trim($text));

我想要得到的答案是

$text ="similique sunt in culpa qui officia
    deserunt mollitia animi, id est laborum et dolorum fuga. 
    Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore
    "

只接受单行换行。

我还想同时修剪多个空白，如果我在下面这样做，我不能保存任何换行!

$text = preg_replace('/'s's+/', ' ', trim($text));

我怎么能做到这两件事在行正则表达式?

您的换行符是'r'n，而不是'n:

$text = preg_replace("/('r'n){3,}/","'r'n'r'n",trim($text));

表示"每次发现3个或更多的换行符时，将它们替换为2个换行符"。

空间:

$text = preg_replace("/ +/", " ", $text);
//If you want to get rid of the extra space at the start of the line:
$text = preg_replace("/^ +/", "", $text);

演示:http://codepad.org/PmDE6cDm

不确定这是否是最好的方法，但我会使用爆炸。例如:

function remove_extra_lines($text)
{
  $text1 = explode("'n", $text); //$text1 will be an array
  $textfinal = "";
  for ($i=0, count($text1), $i++) {
    if ($text1[$i]!="") {
      if ($textfinal == "") {
        $textfinal .= "'n";  //adds 1 new line between each original line
      }
      $textfinal .= trim($text1[$i]);
    }
  }
  return $textfinal;
}

我希望这对你有帮助。好运！