Question

我有一个名为$output的字符串，它返回一个像这样的列表

    Object One


    Object Two


    Object Three

    Object Four
    Object Five

    Object Six

我想使用像这样的爆炸把它变成一个数组：

explode("\n", $output);

但是，开头有很多空行和随机空格。有没有办法删除所有这些，以便我留下一个可用的数组？

Answer 1

您可以使用array_filter过滤掉数组中的空字符串

array_filter(explode("\n", $output));

要删除开头的空格，请使用array_map

$result = array_filter(explode("\n", $output));
array_map('trim', $result);

Answer 2

您可以trim()生成explode()生成的每一行，并忽略修剪后的empty strings。

或者您可以使用preg_split()作为分隔符，包含至少包含一个换行符的任何白色空格序列：

$text = <<<E
        Object One


        Object Two


        Object Three

        Object Four
               Object Five

        Object Six
E;

var_dump(preg_split('/\s*\n(\s*\n)*\s*/', trim($text)));

输出结果为：

array(6) {
  [0]=>
  string(10) "Object One"
  [1]=>
  string(10) "Object Two"
  [2]=>
  string(12) "Object Three"
  [3]=>
  string(11) "Object Four"
  [4]=>
  string(11) "Object Five"
  [5]=>
  string(10) "Object Six"
}

regex：

\s*            # zero or more (*) whitespaces (\s)
\n             # a newline character
(              # beginning of a group
    \s*\n      # zero or more whitespaces followed by a newline
)              # end of the group
*              # zero or more repetitions of the previous expression (the group)
\s*            # zero of more whitespaces

Answer 3

 <?php 
 $data = " Object One


    Object Two


    Object Three

    Object Four
           Object Five

    Object Six";

    $data = explode("\n", $data);
    $finalArray = array();
    foreach($data as $value){
         if(!empty(trim($value))){
            $finalArray[] = trim($value);  
         }
    }

    print_r($finalArray);

输出：

Array ( [0] => Object One [1] => Object Two [2] => Object Three [3] => Object Four [4] => Object Five [5] => Object Six )

Answer 4

试试这个......

<强>输入

 $data = "        Object One


        Object Two


        Object Three

        Object Four
               Object Five

        Object Six";

<强>解决方案

$result = array_filter(array_map('trim',explode("\n", $data)));
echo "<pre>";   print_r($result);

<强>输出

Array
(
    [0] => Object One
    [3] => Object Two
    [6] => Object Three
    [8] => Object Four
    [9] => Object Five
    [11] => Object Six
)

Answer 5

使用preg_split()对所有换行序列（\R）进行拆分，并包括零个或多个前导或尾随空白序列(\s*)。如果输入字符串的开头或结尾处存在与换行符序列不相邻的空格，请预先修剪输入。

代码：（Demo）

var_export(preg_split('~\s*\R\s*~', trim($string), -1, PREG_SPLIT_NO_EMPTY));

输出：

array (
  0 => 'Object One',
  1 => 'Object Two',
  2 => 'Object Three',
  3 => 'Object Four',
  4 => 'Object Five',
  5 => 'Object Six',
)

PHP爆炸换行并剥离空行和空格

5 个答案: