Search and replace value for a key in an array php

Question

I have array like this:

array(
    [0] => Array
    (
        [q_id] => 314
        [answer_type] => RI
        [answer] => 3438
        [user_id] => 
    )

[1] => Array
    (
        [q_id] => 286
        [answer_type] => NM
        [answer] => 5
        [user_id] => 
    )

[2] => Array
    (
        [q_id] => 207
        [answer_type] => SS
        [answer] => 1
        [user_id] => 1
    )
 )

Its expected to have same user_id for all questions that have value for user_id or empty. I want to replace empty user_ids with the existing user_id.

Any better ways to do it other than looping / array_walk?

smottt · Accepted Answer · 2012-08-27 22:26:01Z

1

Don't think so.

$arr = array_map(function ($val) use ($user_id) {
    if (empty($val['user_id'])) {
        $val['user_id'] = $user_id;
    }

    return $val;
}, $arr);

I am of course assuming you have PHP 5.3+

answered Aug 27, 2012 at 22:26

smottt

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Comments

Moe Tsao · Accepted Answer · 2012-08-27 22:33:32Z

0

Anyhow you will need to loop. As it is not clear how big the array could be / how would the array be sorted, there are not many ways to assign the value without walking through them.

Thinking outside the box. Generally the array will be used somewhere in the script and there will be code to access the values inside the array. Is there any chance to assign the desired user_id to the output when you are accessing the array?

answered Aug 27, 2012 at 22:33

Moe Tsao

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1 Comment

Kevin Rave Over a year ago

This array is resulting from the query. So I can't check the value of the user_id of the previous row. The array can be as big as 60 rows.

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