Replace array value with another value based on keys from other array values

Question

I have an array $report:

Array
(
    [03.05.2016] => Array
        (
            [tasks] => Array
                (
                    [group1] => to change
                )

            [start] => 8:00
            [end] => 16:00
        )

)

and a second array $keys:

Array
(
    [0] => 03.05.2016
    [1] => tasks
    [2] => group1
)

and a variable $value with a value CHANGED

I'm looking for a way to change the value of

$report[03.05.2016][tasks][group1]

so that my final array will be:

(
    [03.05.2016] => Array
        (
            [tasks] => Array
                (
                    [group1] => CHANGED
                )

            [start] => 8:00
            [end] => 16:00
        )

)

Can someone help me?

can you write clearly more? i don't stand your question really want? — xuan hung Nguyen
– xuan hung Nguyen, Commented Jun 15, 2016 at 9:23

iainn · Accepted Answer · 2016-06-15 11:52:05Z

1

You can work down through your $report variable, assigning by reference to each "step" in your $keys array, and then change the final level to your new value.

Edit: The advantage of this approach is that it will work for any number of levels, although if you will always only have three steps then the answer from @zakhefron is clearer.

<?php
$report = [
    '03.05.2016' => [
        'tasks' => [
            'group1' => 'to change'
        ],

        'start' => 8:00
        'end'   => 16:00
    ]
];

$keys = ['03.05.2016', 'tasks', 'group1'];

$value = 'CHANGED';

// Start at the top level of $report
$target =& $report;

// Then work down through the keys
while ($key = array_shift($keys))
{
    $target =& $target[$key];
}

// Finally, set the final target to the new value
$target = $value;

print_r($report);

=

Array
(
    [03.05.2016] => Array
        (
            [tasks] => Array
                (
                    [group1] => CHANGED
                )

            [start] => 8:00
            [end] => 16:00
        )

)

edited Jun 15, 2016 at 11:52

answered Jun 15, 2016 at 9:28

iainn

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1 Comment

iainn Over a year ago

Sorry, missed out a &. Fixed it while I tested it and didn't paste it back into the answer. eval.in/589556

zakhefron · Accepted Answer · 2016-06-15 09:27:38Z

1

Try $report[$keys[0]][$keys[1]][$keys[2]] = $value;

Refer : https://3v4l.org/0HBUH

answered Jun 15, 2016 at 9:27

zakhefron

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Comments

kamal pal · Accepted Answer · 2016-06-15 09:56:41Z

You can use recursive function approach here, pass the source, keys and the value to function. It will check if the keys exists in array, if found then call the same function with remaining data, keys and value.

At last keys left empty as all of them searched, now you can simply update the value, and return true, otherwise return false if not found.

$report = array(
    '03.05.2016' => array(
        'tasks' => Array(
            'group1' => 'to change'
        ),
        'start' => '8:00',
        'end' => '16:00'
));

$keys = array(
    '03.05.2016', 
    'tasks',
    'group1'
);

$value = 'CHANGED';

function updateValue(&$source, $keys, $value) {
    $keysCount = count($keys);
    if(empty($keys)) {
        $source = $value;
        return true;
    }
    foreach($keys as $key) {
        if(isset($source[$key])) {
            array_shift($keys);
            return updateValue($source[$key], $keys, $value);
        }
        else return false;
    }
}

updateValue($report, $keys, $value);
print_r($report);

See it working: https://eval.in/589461

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