Convert array values to an array - php

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:
$rawArray is associate array, each of it's element contain string similar to php array.
We're looping through array and converting that string to array by using preg_match_all and building $graph multidimension array.
When loop execute first time $k is equal to A and $v is equal to ['B' => 3, 'C' => 5, 'D' => 9],
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'].
Second preg_match_all make array of values from $v (['B' => 3, 'C' => 5, 'D' => 9],), and assign it to $val[1]. Now $val[1] is array [2, 5, 9].
We're combining$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].

Answer 2

This is how you can do it,
<?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>";
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
)
)

Answer 3

A little ugly but I think this finally does the trick.
I downloaded your file and ran this locally so that the source is exactly as you stated. Then I proceeded to parse it and convert the string value to an actual array
Here's how it looks now:
// 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']);
Final Result:
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
)
)
If you run the below which is your expected output example and then compare the output to my output it is identical:
$graph = [
'A' => ['B' => 3, 'C' => 5, 'D' => 9],
'B' => ['A' => 3, 'C' => 3, 'D' => 4, 'E' => 7],
'C' => ['A' => 5, 'B' => 3, 'D' => 2, 'E' => 6, 'F' => 3],
'D' => ['A' => 9, 'B' => 4, 'C' => 2, 'E' => 2, 'F' => 2],
'E' => ['B' => 7, 'C' => 6, 'D' => 2, 'F' => 5],
'F' => ['C' => 3, 'D' => 2, 'E' => 5],
];
echo '<pre>';
print_r($graph);

Answer 4

The proper answer is: don't create such a strange array ;) But since you did, this should do the trick:
//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!
But remember: eval is evil. If you don't trust the input you need to write your own parser.
Temporary edit for clarification. This is what I get when I run your github example trough json_decode(...,true):
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]"
}
}
This differs from your question.