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<?php
 
function double($value, $key, $signal) {
    echo 2*$signal*$value, PHP_EOL;
}
 
$array = [1, 2, 3, 4];
array_walk($array, "double", -1);

Success #stdin #stdout 0.01s 82880KB

stdin

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Standard input is empty

stdout

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-2
-4
-6
-8

https://ideone.com/MIhkKd

language:

PHP (php 7.3.5)

created:

visibility:

secret

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