PHP: Replace Array Data

Question

I have an array of associative array, I will like to update the values in this array, hence I created a function that looks like this.

//The Array of Associative arrays
 array (size=2)
  0 => 
    array (size=3)
      'slang' => string 'Tight' (length=5)
      'description' => string 'Means well done' (length=15)
      'example-sentence' => string 'Prosper it Tight on that job' (length=28)
  1 => 
    array (size=3)
      'slang' => string 'Sleet' (length=5)
      'description' => string 'Means to send on long errand' (length=28)
      'example-sentence' => string 'I am going to sleep sia' (length=23)

//The function

public function update($slang, $new)
{
  array_map(function($data, $key) use($slang, $new)
  {
    if($data['slang'] == $slang)
    {
      $data[$key] = array_replace($data, $new);
    }
  }, UrbanWord::$data);
}

I tired running this but the original array will not update. I need help on how to go about fixing this please.

Thanks

Afaik, array_map returns an array with the mapped data. You don't seem to catch that return. — Jonnix
– Jonnix, Commented Dec 2, 2015 at 14:48
As much as I love array_map, if you want to replace array elements inline, a plain old foreach (or array_walk) is probably more appropriate here imho. — Darragh Enright
– Darragh Enright, Commented Dec 2, 2015 at 14:52
If you've sorted that, can you update your question's code, then please define doesn't work. Please provide the inputs (UrbanWord::$data, $slang and $new) the current output you're getting, and the expected output you want to get. — Jonnix
– Jonnix, Commented Dec 2, 2015 at 14:54

Mihai Matei · Accepted Answer · 2015-12-02 15:09:26Z

You may use array_reduce instead of array_map as following:

public function update($array, $slang, $new)
{
  return array_reduce($array, function ($result, $item) use ($slang, $new) {
    if ($item['slang'] == $slang) {
       $item = array_replace($item, $new);
    }

    $result[] = $item;

    return $result;
  }, array());
}

Usage:

UrbanWord::$data = $this->update(
  UrbanWord::$data,
  'Tight',
  array('description' => 'another description')
);
var_dump($myUpdatedArray);

If you want to update it directly passing the UrbanWord::$data by reference you may try something like:

class UrbanWord
{
    public static $data = array(
        array(
            'slang' => 'Test',
            'Desc'  => 'Frist Desc'
        ),
        array(
            'slang' => 'Test1',
            'Desc'  => 'Second Desc'
        )
    );
}

class MyClass
{
    public function update(&$array, $slang, $new)
    {
        $array = array_reduce($array, function ($result, $item) use ($slang, $new) {
            if ($item['slang'] == $slang) {
                $item = array_replace($item, $new);
            }

            $result[] = $item;

            return $result;
        }, array());
    }
}

$myClass = new MyClass();
$myClass->update(UrbanWord::$data, 'Test', array('Desc' => 'test'));

echo '<pre>';
var_dump(UrbanWord::$data);
echo '</pre>';

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