CODEWITHSUNDEEP
php
user2355058
user2355058

Reputation:

Can associative array values be arrays

Here is a simple problem that I was unable to solve with php.I want to convert the first array to something like this: ["BMW"=>["g4","g3"], "Mercedes"=>["f1"]]

$array = ["F1" => "Mercedes", "g3"=>"BMW", "g4"=>"BMW"];
$newArray = [];

foreach($array as $key=>$value){
  if(!in_array($value, $newArray){
      $element = $value => [$key];
      array_push($newArray, $element);
  } else {
      array_push($newArray[$value],$key);
  }
}

$element = $value =>[]; on line 6 was my intuitive solution but is invalid.

Am I using a poor pattern, is this inadvisable? According to official documentation, "The value can be of any type."

Upvotes: 0

Views: 59

Answers (2)

Jaydeep Mor
Jaydeep Mor

Reputation: 1703

Try this.

<?php
$array = ["F1" => "Mercedes", "g3"=>"BMW", "g4"=>"BMW"];
$newArray = [];

foreach($array as $key=>$value){
$newArray[$value][]=$key;
}
echo "<pre>";
print_r($newArray);
exit;
?>

Upvotes: 0

Sougata Bose
Sougata Bose

Reputation: 31749

You can simply do - 

$array = ["F1" => "Mercedes", "g3"=>"BMW", "g4"=>"BMW"];
$newArray = [];

foreach($array as $key => $value) {
    $newArray[$value][] = $key;
}

print_r($newArray);

Output

Array
(
    [Mercedes] => Array
        (
            [0] => F1
        )

    [BMW] => Array
        (
            [0] => g3
            [1] => g4
        )

)

For the order you are expecting add ksort($newArray);

The output will be - 

Array
(
    [BMW] => Array
        (
            [0] => g3
            [1] => g4
        )

    [Mercedes] => Array
        (
            [0] => F1
        )

)

ksort()

Demo

Upvotes: 5

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