return specific array form from function

Question

i have this array

$array = [1, 2, 3, 4, 5];

and this function

function change($array) {
    foreach ($array as $key => $value) {
        $form[$key+5][$value-1] = $key-$value;
    }
    return $form;
}
change($array);

in it the form that i want to rearrange the array in is $form[$key+5][$value-1] = $key-$value; but i want to make it defined by a parameter like this

function change($array, $form) {
    foreach ($array as $key => $value) {
        $form;
    }
    return $form;
}
$x = change($array, $arr[$key+5][$value-1] = $key-$value);
$y = change($array, $arr[$key+5][$key+100] = $key+$value);

how can this be done?

AbraCadaver · Accepted Answer · 2019-07-18 20:39:38Z

1

Somebody will bash all of the evils of eval but if it is not user supplied (un-trusted) data, then this works:

function change($array, $form) {
    foreach ($array as $key => $value) {
        eval("\$result$form;");
    }
    return $result;
}

You need to call it with a string as shown:

$x = change($array, '[$key+5][$value-1] = $key-$value');
$y = change($array, '[$key+5][$key+100] = $key+$value');

This builds a string that looks like this: $result[$key+5][$key+100] = $key+$value; and evaluates it as PHP code.

It would be a lot more work, but you could pass in something to parse and adapt it to How to access and manipulate multi-dimensional array by key names / path?.

edited Jul 18, 2019 at 20:39

answered Jul 18, 2019 at 20:29

AbraCadaver

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2 Comments

Joe Doe Over a year ago

everytime i read about eval i understood why its dangerous but never cared about it because i never thought or knew how to use it in any of my codes - now i know

Joe Doe Over a year ago

is there other methods to mimic this without eval too?

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