Empty a global variable from within a function

Asked Jun 14 '19 at 15:19

Active Jun 14 '19 at 15:25

Viewed 22 times

I need to empty a global variable from withing a user-defined function. My understanding is that this should be possible assuming you set the global variable with [global] inside the user-defined function.

My attempts as below:

<pre>
<?php

$storage_clean_from_values = "yes";

$storage = [1,2,3];
var_dump($storage);

function clean_storage() {

    global $storage;

    if ($storage_clean_from_values == "yes") {
        $storage = [];
    }

}

clean_storage();

var_dump($storage);

Output

array(3) { # Outcome of first [var_dump].
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}
array(3) { # Outcome of second [var_dump].
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}

Wanted behaviour:

The first [var_dump] should show all the existing values in [$storage], the second [var_dump] should show the [$_storage] but content should be blank.

edited Jun 14 '19 at 15:25

asked Jun 14 '19 at 15:19

Toolbox

2,333
12
26

what output does your attempt give? – Krishanu Jun 14 '19 at 15:23
2

Your function __knows nothing__ about `$storage_clean_from_values`. – u_mulder Jun 14 '19 at 15:25
@Krishanu I updated the question with "output" – Toolbox Jun 14 '19 at 15:26
1

like `$storage`, put `global $storage_clean_from_values;` – Krishanu Jun 14 '19 at 15:28

Empty a global variable from within a function

0 Answers0