add key value pair to existing array

Question

I have an the variable $users set to an array that resembles the below

Array(
    [4] => Array(
        [userid] => 4
        [name] => Mike
        [gender] => M
    )

    [5] => Array(
        [userid] => 5
        [name] => Sally
        [gender] => F
    )

    [6] => Array(
        [userid] => 6
        [name] => Steve
        [gender] => M
    )
)

I then have code that loops through this array to call a function to calculate age.

foreach($users as $user){
    $age = getUserAge($user->id);
}

How do I take the variable $age and add it into $users to result with the follow array?

Array(
    [4] => Array(
        [userid] => 4
        [name] => Mike
        [gender] => M
        [age] => 35
    )

    [5] => Array(
        [userid] => 5
        [name] => Sally
        [gender] => F
        [age] => 24
    )

    [6] => Array(
        [userid] => 6
        [name] => Steve
        [gender] => M
        [age] => 32
    )
)

AGB · Accepted Answer · 2020-04-18 23:13:37Z

18

foreach($users as &$user){
    $age = getUserAge($user['userid']);
    $user['age'] = $age;
}

Compact Version:

foreach($users as &$user){
    $user['age'] = getUserAge($user['userid']);
}

Note the ampersand before the array variable name meaning the variable is passed by reference, and so can be modified. See the docs for more info.

edited Apr 18, 2020 at 23:13

AGB

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answered Dec 21, 2013 at 4:53

chanchal118

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1 Comment

Hanky Panky Over a year ago

Use $user["userid"] since its an array not an object

chanchal118 · Accepted Answer · 2013-12-21 05:10:15Z

11

foreach($users as $index => $user) {
    $users[$index]['age'] = getUserAge($user['userid']);
}

edited Dec 21, 2013 at 5:10

chanchal118

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answered Dec 21, 2013 at 5:07

Adrian

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1 Comment

Ben in CA Over a year ago

This method worked for me where the above didn't, since the &$ was messing with other aspects.

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