Get Array value from nested Array with Array as parent/child mapping

Question

Lets say I have an array like this:

$a = array(
    "foo",
    "bar"
);

and

$b = array(
    "foo" => array(
        "bar" => 1
    )
);

and I want to use $a to get $b[$a[0]][$a[1]]

Assumptions are 1..* length of $a and 1..* levels in $b.

... and what you are attempting to obtain. Why does not $b[$a[0]][$a[1]] work for you? — Eineki
– Eineki, Commented Jan 5, 2015 at 19:23
@Eineki he wants a solution that works for any level of nesting — Barmar
– Barmar, Commented Jan 5, 2015 at 19:27
@Barmar I guessed the scope a couple of minutes after the comment posting (it still a poorly expressed question to me). I was working on the topics but you came out with a nice solution (I would just embrace the code into a try...catch to manage missing index) — Eineki
– Eineki, Commented Jan 5, 2015 at 19:37

Barmar · Accepted Answer · 2015-01-05 19:53:57Z

2

$result = $b;
foreach ($a as $index) {
    $result = $result[$index];
}
echo $result;

edited Jan 5, 2015 at 19:53

answered Jan 5, 2015 at 19:26

Barmar

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1 Comment

Rizier123 Over a year ago

That doesn't work at all! Because at the second iteration it's: $b["bar"], which don't exists!

Rizier123 · Accepted Answer · 2015-01-05 19:30:03Z

1

This should work for you:

<?php

    //As an example
    $a = array(
        "foo",
        "bar",
        "xy",
        "ab"
    );

    $b = array(
        "foo" => array(
            "bar" => array(
                "xy" => array(
                    "ab" => 14  
                ),
            ),
        )
    );

    $end = $b;
    foreach ($a as $index)
        $end = $end[$index];

    echo $end;

?>

Output:

answered Jan 5, 2015 at 19:30

Rizier123

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