PHP array_map callback function inside function

Question

I have a function called createCost, and inside that function, I have an array_map that takes in an array and a function called checkDescription that's inside that createCost. Below is an example:

public function createCost{

  $cost_example = array();
  function checkDescription($array_item)
  {
    return $array_item;
  }

  $array_mapped = array_map('checkDescription', $cost_example);
}

When I run this I get a

array_map() expects parameter 1 to be a valid callback, function 'checkDescription' not found or invalid function name

Which to my understanding is that it looked for the function checkDescription outside that createCost but how can I call checkDescription from inside?

That should work, but would fail later for other reasons… how about a simple anonymous function…? — deceze
– deceze ♦, Commented Jul 5, 2017 at 13:11
Nesting functions!?! That's never sensible, and commonly misunderstood, as functions are never actually "nested"... but is your class namespaced, for example? — Mark Baker
– Mark Baker, Commented Jul 5, 2017 at 13:11
@deceze Not really because my understanding of Array_Map is that it looks for the function that exists outside the Map... — Greg Sithole
– Greg Sithole, Commented Jul 5, 2017 at 13:21
Not sure what you mean by that, but it works just fine: stackoverflow.com/a/44927275/476 — deceze
– deceze ♦, Commented Jul 5, 2017 at 13:22
@deceze No worries.... it's all sorted because of the answer below — Greg Sithole
– Greg Sithole, Commented Jul 5, 2017 at 13:25

Bibhudatta Sahoo · Accepted Answer · 2017-07-05 13:11:47Z

16

Do like this

public function createCost(){
    $cost_example = array();
    $array_mapped = array_map(function ($array_item){
        return $array_item;
    }, $cost_example);
}

answered Jul 5, 2017 at 13:11

Bibhudatta Sahoo

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Comments

Gruber · Accepted Answer · 2020-01-09 07:45:00Z

4

Why not assign the function to a variable?

public function createCost{

  $cost_example = array();
  $checkDescription = function ($array_item) {
                          return $array_item;
                      }

  $array_mapped = array_map($checkDescription, $cost_example);
}

Isn't this more readable too?

answered Jan 9, 2020 at 7:45

Gruber

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