How to populate array outside of the closure in PHP?

Question

I wrote this

 $result = array();

        array_map(function($row) use ($result) {
            $result[$row->id] = array();
            $result[$row->id]['geojson'] = $row->geojson;
        }, $regions);

and $result is empty at the end.

Is it possible to populate array this way?

Looks like it should work, what is var_dump($regions);?

Dave Chen
– Dave Chen

2017-04-06 20:05:57 +00:00
Commented Apr 6, 2017 at 20:05 — Dave Chen
– Dave Chen, Commented Apr 6, 2017 at 20:05

Barmar · Accepted Answer · 2017-04-06 20:21:02Z

6

$result inside the function is a copy of the outer array, so changes you make don't affect the original. You need to use a reference: use (&$result)

array_map(function($row) use (&$result) {
    $result[$row->id] = array();
    $result[$row->id]['geojson'] = $row->geojson;
}, $regions);

Or you could simply use foreach

foreach ($regions as $row) {
    $result[$row->id] = array();
    $result[$row->id]['geojson'] = $row->geojson;
}

answered Apr 6, 2017 at 20:21

Barmar

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