PHP array merge / map of two arrays

Question

I have two arrays, one that contains all options, and a second one that contains the default values.

The options arrays looks like this:

$options = array(
   "SeriesA" => array(
       "A1" => array(
          "text" => "A1",
          "value" => "A-001"
        ),
       "A2" => array(
          "text" => "A2",
          "value" => "A-002"
        )
    ),
  "SeriesB" => array(
       "B1" => array(
          "text" => "B2",
          "value" => "B-001"
        ),
       "B2" => array(
          "text" => "B2",
          "value" => "B-002"
        )
    ),
);

And I have another array that contains default value, and it looks like this

$defaults= array(
   "SeriesA" => "A-002",
   "SeriesB" => "B-001",
);

What I would like to end up with is one array that contains all info, is there a way that I can map both arrays and get one array that will look like this:

$options = array(
   "SeriesA" => array(
       "A1" => array(
          "text" => "A1",
          "value" => "A-001",
          "default" => false
        ),
       "A2" => array(
          "text" => "A2",
          "value" => "A-002",
          "default" => true
        )
    ),
  "SeriesB" => array(
       "B1" => array(
          "text" => "B2",
          "value" => "B-001",
          "default" => true
        ),
       "B2" => array(
          "text" => "B2",
          "value" => "B-002",
          "default" => false
        )
    ),
);

Just make a foreach loop wich is testing wich array in the series array is the default, and put a "default" => true value in the array. In every other array in a series array, put a "default" => false value. — Jonas Geiler
– Jonas Geiler, Commented Jul 6, 2016 at 11:03
Is this coming from a database? If so you can do this all in the SQL. — nerdlyist
– nerdlyist, Commented Jul 6, 2016 at 11:41

Alexey Zverev · Accepted Answer · 2016-07-06 11:34:53Z

1

Here is two ways to do it:

Make a function, which accepts two args and check value in a loop with defaults, add defaults, and returns new array, or edit array, passing it by reference:

function awesomeName(&$options, $defaults) {
    foreach ($options as $k => &$values) {
        foreach ($values as &$AsAndBs) {
            $AsAndBs['default'] = $AsAndBs['value'] == $defaults[$k];
        }
    }
}

Using array_walk() function with anonymous function:

array_walk($options, function (&$v, $k) use ($defaults) {
    $series = $k;
    foreach ($v as &$series_contents) {
        $series_contents['default'] = $series_contents['value'] == $defaults[$series];
    }
});

answered Jul 6, 2016 at 11:34

Alexey Zverev

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