PHP - Remove element from multidimensional String

Question

I have the following string Available:

$flatPath = '0/instances/0';

With this information I want to be able to unset the element from a multidimensional array like this:

$array = [['instances' => [1,2], ['instances' => [3,4]]

Therefor the Result should look like:

$array = [['instances' => [2], ['instances' => [3,4]]

Statically it would look like:

unset($array[0]['instances'][0]);

I want to be able to remove items in any given string path if available in the array. Therefore the solution has to be able to remove any item from a multidimensional array, irrespective of the structure of the $array, as long as the $flatPath exists.

Thank you in advance.

Perhaps stackoverflow.com/questions/9627252/… would be a starting point. — Nigel Ren
– Nigel Ren, Commented Jan 7, 2021 at 12:04
I tried the code snippet, but nothing happened at all. Thanks anyways. — Wolf-Tech
– Wolf-Tech, Commented Jan 7, 2021 at 12:23
As I mentioned - it's a starting point, you would need to amend the code to do the exact thing you need. — Nigel Ren
– Nigel Ren, Commented Jan 7, 2021 at 12:32

Nigel Ren · Accepted Answer · 2021-01-07 12:55:11Z

2

Using the code from https://stackoverflow.com/a/9627299/1213708 as a starting point, this code follows the process with a few tweaks.

Exploding using / to split the string into it's parts, then it removes the last key so it can unset() that particular value from the layer above. Then it loops through the keys to find the layer above, and unsets the appropriate value...

$keys = explode('/', $flatPath);
$endKey = array_pop($keys);
$arr = &$array;
foreach ($keys as $key) {
    $arr = &$arr[$key];
}
unset($arr[$endKey]);
unset($arr);

answered Jan 7, 2021 at 12:55

Nigel Ren

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4 Comments

Wolf-Tech Over a year ago

Thank you. But the result is not $array = [['instances' => [2], ['instances' => [3,4]]

Nigel Ren Over a year ago

What do you get as the output?

berend Over a year ago

@Sandor Farkas The provided solution produces the desired outcome - what exactly do you mean But the result is not...?

Wolf-Tech Over a year ago

Great job @NigelRen ! Thank you, i checked the wrong $variable as output....

WiatroBosy · Accepted Answer · 2021-01-07 15:19:32Z

0

Try this

function check_diff_multi($array1, $array2){
    $result = array();
    foreach($array1 as $key => $val) {
        if(array_key_exists($key,$array2)){
            if(is_array($val) && is_array($array2[$key]) && !empty($val)){
                $result[$key] = $this->check_diff_multi($val, $array2[$key]);
            }
        } else {
            $result[$key] = $val;
        }
    }
    return $result;
}



        $dane = array(array('instances' => [1,2]), array('instances' => [3,4]));
        $flatPath = '0/instances/0';
        
        $test = array();
        foreach (array_reverse(explode('/', $flatPath)) as $value)
        {
            if(empty($test))
            {
               $test = array($value => '');
            }
            else
            {
                $test = array($value => $test);
            }
        }
        
        var_dump(check_diff_multi($dane, $test));

method check_diff_multi comes from https://stackoverflow.com/a/12261512/14912402

edited Jan 7, 2021 at 15:19

answered Jan 7, 2021 at 13:48

WiatroBosy

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2 Comments

jibsteroos Over a year ago

You might want to add the source @fdrv of the function you're using.

WiatroBosy Over a year ago

Bat @Sandor Farkas the author of the post does not respond :(

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