convert array to dictionary in php

Question

I have array (returns from database), looks like this:

response = {
    0 = {
        id = "12312132",
        title = "title1",
        ....
        createDT = "2015-03-03 22:53:17"
        }
    1 = {
        id = "456456456",
        title = "title2",
        ....
        createDT = "2015-03-03 22:53:17"
        }
    2 = {
        id = "789789789",
        title = "title3",
        ....
        createDT = "2015-03-03 22:53:17"
        }
    }

I need to convert this in dictionary use php like this:

response = {
    "12312132" = {
        title = "title1",
        ....
        createDT = "2015-03-03 22:53:17"
        }
    "456456456" = {
        title = "title2",
        ....
        createDT = "2015-03-03 22:53:17"
        }
    "789789789" = {
        title = "title3",
        ....
        createDT = "2015-03-03 22:53:17"
        }
    }

i.e. key is id. Perhaps there is some function in php, for do it easy?

Solution 1

There is nothing of dictionary term in PHP. What you actually mean is an associative array, also commonly known as a hash. The same thing though, but this can make it easier to google up in future.

You can do it in several ways, I will give you classic foreach() one. I think array_map() approach would be possible too.

$response = ...;        // your database response
$converted = array();   // declaring some clean array, just to be sure

foreach ($response as $row) {
    $converted[$row['id']] = $row;        // entire row (for example $response[1]) is copied 
    unset($converted[$row['id']]['id']);  // deleting element with key 'id' as we don't need it anymore inside
}
print_r($converted);

Solution 2

No, but you can write a little program in PHP:

$result = array();
foreach ($response as $row)
{
  $id = $row['id'];
  unset($row['id']);
  $result[$id] = $row;
}

echo '<pre>';
print_r($result);
echo '</pre>';

And even make that into your own function:

function dictonary($response) 
{
  $result = array();
  foreach ($response as $row)
  { 
    $id = $row['id'];
    unset($row['id']);
    $result[$id] = $row;
  }
  return $result;
}

Comments

[n-dru]

And before that loop $result = array();

[KIKO Software]

@n-dru: Yes it is good practice to initialize. I will add it. Thank you.

[Niols]

The problem with array_map is that it can't work on keys. A foreach loop is often faster anyway.

[Forien]

@Niols Thanks, I wasn't sure. I'm not big fan of array_map and array_walk and don't know everything about them.

[Niols]

It might be possible with array_walk (stackoverflow.com/questions/13036160/…). But yeah, that wont be an efficient code.