将数组值转换为数组

时间：2018-07-19 21:10:54

标签： php

我不知道如何有效地将此数组的值从字符串转换为数组。我真的很感谢任何建议。

    array(6) {
  ["A"]=>
  string(31) "['B' => 3, 'C' => 5, 'D' => 9],"
  ["B"]=>
  string(41) "['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7],"
  ["C"]=>
  string(51) "['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3],"
  ["D"]=>
  string(51) "['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2],"
  ["E"]=>
  string(41) "['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5],"
  ["F"]=>
  string(31) "['C' => 3, 'D' => 2, 'E' => 5],"
}

所需的输出：

    $graph = [
    'A' => ['B' => 3, 'C' => 5, 'D' => 9],
    'B' => ['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7],
    'C' => ['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3],
    'D' => ['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2],
    'E' => ['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5],
    'F' => ['C' => 3, 'D' => 2, 'E' => 5],
 ];

4 个答案:

答案 0 :(得分：4)

似乎您正在尝试将数组字符串转换为数组。

您可以重复循环或通过make函数获得所需的输出。

我在 preg_match_all

中使用正则表达式

代码 

$rawArray  =  array("A"=>"['B' => 3, 'C' => 5, 'D' => 9],",
    "B"=>"['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7],",
    "C"=>"['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3],",
    "D"=>"['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2],",
    "E"=>"['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5],",
    "F"=>"['C' => 3, 'D' => 2, 'E' => 5],",
);
foreach($rawArray as $k => $v){
preg_match_all("/\'(.)\'/", $v, $key);
preg_match_all("/=> (\d)/", $v, $val);
$graph[$k] = array_combine($key[1], $val[1]);
}
print_r($graph);

输出 

Array
(
    [A] => Array
        (
            [B] => 3
            [C] => 5
            [D] => 9
        )

    [B] => Array
        (
            [A] => 3
            [C] => 3
            [D] => 4
            [E] => 7
        )

    [C] => Array
        (
            [A] => 5
            [B] => 3
            [D] => 2
            [E] => 6
            [F] => 3
        )

    [D] => Array
        (
            [A] => 9
            [B] => 4
            [C] => 2
            [E] => 2
            [F] => 2
        )

    [E] => Array
        (
            [B] => 7
            [C] => 6
            [D] => 2
            [F] => 5
        )

    [F] => Array
        (
            [C] => 3
            [D] => 2
            [E] => 5
        )

)

实时demo

说明：

  1. $ rawArray 是关联数组，每个元素都包含类似于php数组的字符串。

  2. 我们正在遍历数组，并使用 preg_match_all 并构建 $ graph 多维数组，将该字符串转换为数组。

  3. 第一次执行循环时，$k等于A，而$v等于['B' => 3, 'C' => 5, 'D' => 9],

  4. 首先 preg_match_all 从 $ v （['B' => 3, 'C' => 5, 'D' => 9],）中创建键数组，并将其分配给$key[1]。现在$key[1]是数组['B', 'C', 'D']。

  5. 第二个 preg_match_all 从 $ v 组成值数组（['B'=> 3，'C'=> 5，'D'=> 9]，），并将其分配给$val[1]。现在$val[1]是数组[2, 5, 9]。

  6. 通过将 array_combine 用于$key[1]，其中$val[1]是{ {1}}。

preg_match_all如何工作？ 

$graph[$k]

它匹配字符串中的模式，然后将结果作为数组分配给$k。

了解更多信息。
preg_match_all
regex pattern cheat sheet

注意：：我们使用的是非捕获模式，因此它同时返回完全匹配项和所需的匹配项...因此我们在A中找到了所需的记录。

答案 1 :(得分：1)

有点丑陋，但我认为这终于可以解决问题了。

我下载了您的 file 并在本地运行，以确保源与您所说的完全相同。然后我继续解析它，并将字符串值转换为实际数组

这是现在的样子：

// Parse graph.json file
$json = json_decode(file_get_contents('graph.json'), true);

foreach ($json as $key => $value) {
    foreach ($value as $k => $val) {
        $str = str_replace(['[', ']'], '', $val);
        $str = str_replace(' => ', ',', $str);
        $str = str_replace("'", "", $str);
        $str = explode(',', $str);

        for ($x = 0; $x < count($str); $x = $x + 2) {
            $graph[$k][trim($str[$x])] = $str[$x+1];
        }
    }
}

// Result
echo "<pre>";
print_r($graph);

// Proof it is an array now (result 3)
// echo '<pre>';
// print_r($graph['A']['B']);

最终结果：

Array
(
    [A] => Array
        (
            [B] => 3
            [C] => 5
            [D] => 9
        )

    [B] => Array
        (
            [A] => 3
            [C] => 3
            [D] => 4
            [E] => 7
        )

    [C] => Array
        (
            [A] => 5
            [B] => 3
            [D] => 2
            [E] => 6
            [F] => 3
        )

    [D] => Array
        (
            [A] => 9
            [B] => 4
            [C] => 2
            [E] => 2
            [F] => 2
        )

    [E] => Array
        (
            [B] => 7
            [C] => 6
            [D] => 2
            [F] => 5
        )

    [F] => Array
        (
            [C] => 3
            [D] => 2
            [E] => 5
        )

)

如果运行下面的示例，这是预期的输出示例，然后将输出与我的输出进行比较，则结果是相同的：

$graph = [
    'A' => ['B' => 3, 'C' => 5, 'D' => 9],
    'B' => ['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7],
    'C' => ['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3],
    'D' => ['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2],
    'E' => ['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5],
    'F' => ['C' => 3, 'D' => 2, 'E' => 5],
 ];

echo '<pre>';
print_r($graph);

答案 2 :(得分：1)

这是您的操作方式，

<?php

$graph =  array("A"=>"['B' => 3, 'C' => 5, 'D' => 9],",
    "B"=>"['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7],",
    "C"=>"['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3],",
    "D"=>"['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2],",
    "E"=>"['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5],",
    "F"=>"['C' => 3, 'D' => 2, 'E' => 5],",
);



foreach ($graph as $key => $value) {
  $val = str_replace("[","{",$value);
  $val = str_replace("]","}",$val);
  $val = str_replace("'",'"',$val);
  $val = str_replace("=>",":",$val);
  $val = rtrim($val, ',');

  $graph[$key] = json_decode($val, true);
}

echo "<pre>";
print_r($graph);
echo "</pre>";

输出 

Array
(
    [A] => Array
        (
            [B] => 3
            [C] => 5
            [D] => 9
        )

    [B] => Array
        (
            [A] => 3
            [C] => 3
            [D] => 4
            [E] => 7
        )

    [C] => Array
        (
            [A] => 5
            [B] => 3
            [D] => 2
            [E] => 6
            [F] => 3
        )

    [D] => Array
        (
            [A] => 9
            [B] => 4
            [C] => 2
            [E] => 2
            [F] => 2
        )

    [E] => Array
        (
            [B] => 7
            [C] => 6
            [D] => 2
            [F] => 5
        )

    [F] => Array
        (
            [C] => 3
            [D] => 2
            [E] => 5
        )

)

答案 3 :(得分：-1)

正确的答案是：不要创建一个奇怪的数组;）但是，既然您这样做了，就应该做到这一点：

//or $graph instead of $result
$result = array_map(function($value) {
    //use eval to directly evaluate the string
    //we just need to remove the trailing comma
    //and add a semicolon
    eval('$ret = '.rtrim($value,',').';');
    return($ret);
}, $array); // replace $array with the var name of your array!

但是请记住：评估是邪恶的。如果您不信任输入，则需要编写自己的解析器。

临时编辑以进行澄清。这是我在运行您的github示例槽json_decode(...,true)时得到的结果：

array(6) {
[0]=>
  array(1) {
  ["A"]=>
  string(30) "['B' => 3, 'C' => 5, 'D' => 9]"
  }
  [1]=>
  array(1) {
  ["B"]=>
  string(40) "['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7]"
  }
  [2]=>
   array(1) {
   ["C"]=>
     string(50) "['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3]"
   }
  [3]=>
  array(1) {
  ["D"]=>
  string(50) "['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2]"
  }
  [4]=>
  array(1) {
  ["E"]=>
   string(40) "['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5]"
  }
   [5]=>
 array(1) {
  ["F"]=>
   string(30) "['C' => 3, 'D' => 2, 'E' => 5]"
  }
  }

这与您的问题不同。

相关问题
最新问题