PHP, is it possible to use an anonymous function in array to get certain value?

Question

$arr = array(
    'key1' => 1,
    'key2' => 'value2',
    'key3' => function() {
         if (someConditionSomewhere) {
             return 3;
         } else {
             return 'value3';
         }
    },
);

Let's look at example above. This is what I would love to get in PHP. Create an array, type determinant values there by myself and then for the dynamic value pass a function. I know you can pass anonymous function to arrays since 5.3. But I am not interested in the function alone but rather what it returns. So if I do this later: $arr[key3] I want to get either 3 or 'value3' depending what is there. NOT the function itself.

Is it even possible in PHP?

can you not write the function before and assign it to a variable then put it in an array ? — jitendrapurohit
– jitendrapurohit, Commented Aug 25, 2015 at 11:12

Daniel Krom · Accepted Answer · 2015-08-25 11:22:18Z

1

you can check if it's function and then use it

if(is_callable($arr["key3"]))
    $value = $arr["key3"](); //it's function lets add ()
else
    $value = $arr["key3"]; //it's not a function

echo $value;

or in shorter syntax $value = is_callable($arr["key3"]) ? $arr["key3"]() : $arr["key3"];

edited Aug 25, 2015 at 11:22

answered Aug 25, 2015 at 11:13

Daniel Krom

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Comments

Community · Accepted Answer · 2017-05-23 11:43:55Z

1

not possible you have to call them manually in any lang.

$arr[key3] //will return the function reference. so, call that function to execute it.

//like this.

$arr[key3]();

you can go through more at this answer

edited May 23, 2017 at 11:43

CommunityBot

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answered Aug 25, 2015 at 11:14

Raghavendra

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2 Comments

Tomasz Gałkowski Over a year ago

I could swear you could do it in JS and JSON. But JSON is actually quite different thing.

Raghavendra Over a year ago

no you can't you have to call them in javascript also

jitendrapurohit · Accepted Answer · 2015-08-25 11:17:19Z

0

can you not write the function before and assign it to a variable then put it in an array ?

function test() {
 if (someConditionSomewhere) {
   return 3;
 } else {
     return 'value3';
   }
}
$value = test();

$arr = array(
  'key1' => 1,
  'key2' => 'value2',
  'key3' => $value,
);

answered Aug 25, 2015 at 11:17

jitendrapurohit

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