我想发送参数到数组中的功能

Question

i am trying to use this code:

$arr = [
  function ($a) {
    return $a + $a;
},
  function ($b) {
    return $b * $b;
},
  function ($c,$cc) {
    return $c % $cc - $c;
},
  function ($d) {
    return $d + 4 / $d;
 }
];

how can i pass parameters to this functions? i have already learned this statment for function with no arguments. for example: function () { echo 'somethings'; } that's mean this function in an array don't have incoming arguments.

$test = rand (0,1);
echo $myarr[$test]();

In addition

can i change (rand) statment with other statment in the above code snippet?

Answer 1

You can do the following:

Your array:

$arr = [
    function ($a) {
        return $a + $a;
    },
    function ($b) {
        return $b * $b;
    },
    function ($c,$cc) {
        return $c % $cc - $c;
    },
    function ($d) {
        return $d + 4 / $d;
    }
];

Your rand

$test = rand(0,1);

---- note ----

you can change your rand() to any other statement provided that it an existing index of the $arr array. in order to know if $test value is an index which exists in the $arr array, you can do

if (isset($arr[$test])) {}

---- end note ---

to call the functions

$returnedValue = call_user_func($arr[$test], 10);
echo $returnedValue;