Illegal string offset in array_map

Question

Try use function array_map

 array_map(function ($items) {
                    return $items[$this->relatedKey];
                }, $this->parseIds($ids))

$ids is array of item => value:

 $ids = array:1 [
      "parent_id" => "15"
    ]

Key what need to find:

$this->relatedKey = "parent_id"

And get error:

Illegal string offset 'parent_id'

What I do wrong?

if you do array_map on an array, you get the values in the var $items, so "15" in your case, and "15" has no index "parent_id", it's not an array. It seems you use array_map for the wrong purpose, it is used to apply a function to all items in an array and return resulting new array with affected values. To acces a specific key in PHP, simply use $ids[$this->relatedKey] — Kaddath
– Kaddath, Commented Mar 2, 2018 at 11:10

xyzale · Accepted Answer · 2018-03-02 13:41:04Z

1

Look at this example taken from the documentation (http://php.net/manual/en/function.array-map.php):

<?php
function cube($n)
{
    return($n * $n * $n);
}

$a = array(1, 2, 3, 4, 5);
$b = array_map("cube", $a);
print_r($b);

It will return an array with 1, 8, 27, etc ...

The name $items you used for the parameter is misleading, because the argument will be each single $item of your array, and array_map() is supposed to transform it somehow.

I'm not sure about what you want to do, but apparently you won't need array_map() for your purpose.

answered Mar 2, 2018 at 13:41

xyzale

7958 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Illegal string offset in array_map

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related