将数组值转换为数组

Question

I can't figure out how to effectively convert the values of this array from a string to array. I really appreciate any suggestion.

    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],"
}

Desired output:

    $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],
 ];

Answer 1

Seems like you're trying to convert array string to an array.

You can repeat through loop or make function to get your desired output.

I'm using regular expression with preg_match_all

Code

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

Output

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
        )

)

Live demo

Explanation:

1. $rawArray is associate array, each of it's element contain string similar to php array.

2. We're looping through array and converting that string to array by using preg_match_all and building $graph multidimension array.

3. When loop execute first time $k is equal to A and $v is equal to ['B' => 3, 'C' => 5, 'D' => 9],

4. First preg_match_all make array of keys from $v (['B' => 3, 'C' => 5, 'D' => 9],), and assign it to $key[1]. Now $key[1] is array ['B', 'C', 'D'].

5. Second preg_match_all make array of values from $v (['B' => 3, 'C' => 5, 'D' => 9],), and assign it to $val[1]. Now $val[1] is array [2, 5, 9].

6. We're combining$key[1]as keys and $val[1] as values by using array_combine to the $graph[$k] where $k is A.

How preg_match_all works?

preg_match_all($pattern, $string, $out);

It's matches pattern from string and then assign result to the $out as array.

Learn more about.
preg_match_all
regex pattern cheat sheet

Note: We're using non-capturing pattern so, it's return both exact match and desired match... So our desired record found in$key[1].