Call class method from inside array_map anonymous function

Question

I am trying to call one of my object's methods from within an array_map anonymous function. So far I am receiving the expected error of:

Fatal error: Using $this when not in object context in...

I know why I am getting this error, I just don't know a way to achieve what I am trying to... Does anybody have any suggestions?

Here is my current code:

// Loop through the data and ensure the numbers are formatted correctly
array_map(function($value){
    return $this->some_method($value,'value',false);
},$this->mssql->data[0]['results'][0]);

Upgrade to PHP 5.4, which added support for `$this` in closures. — igorw, Oct 11 '13 at 12:13

score 6 · Accepted Answer · edited Oct 11 '13 at 11:25

6

You can tell the function to "close over" the $this variable by using the "use" keyword

$host = $this;
array_map(function($value) use ($host) {
    return $host->some_method($value,'value',false);
},$this->mssql->data[0]['results'][0]);

edited Oct 11 '13 at 11:25

Ben Carey

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answered Oct 11 '13 at 11:10

Cillier

1,021
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You do not need to pass objects by reference like `&$object`, because objects are already passed by reference. – Glavić Oct 11 '13 at 11:20

score 0 · Answer 2 · answered Oct 11 '13 at 11:21

0

Also, you can call your map function from a class context and you will not receive any errors. Like:

class A {

        public $mssql = array(
                'some output'
            );

        public function method()
        {
            array_map(function($value){
                return $this->mapMethod($value,'value',false);
            },$this->mssql);

        }

        public function mapMethod($value)
        {
            // your map callback here
            echo $value; 

        }


    }

    $a = new A();

    $a->method();

answered Oct 11 '13 at 11:21

Cristian Bitoi

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This is exactly what I am doing! – Ben Carey Oct 11 '13 at 11:23
Hmmm, i'm not so sure that your code look exactly the same, because you sould not receive that error if you do so, and i'm pretty sure. – Cristian Bitoi Oct 11 '13 at 11:32

Call class method from inside array_map anonymous function

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