Isolate a specific column of values in an array of objects [duplicate]

Question

I have an array of objects as follows:

[0] => stdClass Object
    (
        [lid] => 2492
        [post_title] => Winter League 2012/2013
        [eid] => 2121
        [etitle] => a 2013
        [rid] => 2358
        [rtitle] => sdcc2013_2M_W
        [rtype] => W
    )

[1] => stdClass Object
    (
        [lid] => 2492
        [post_title] => Winter League 2012/2013
        [eid] => 2121
        [etitle] => a 2013
        [rid] => 2359
        [rtitle] => sdcc2013_4M_M
        [rtype] => M
    )

[2] => stdClass Object
    (
        [lid] => 2492
        [post_title] => Winter League 2012/2013
        [eid] => 2123
        [etitle] => e 2013
        [rid] => 2360
        [rtitle] => eircom_Women_2.5Mile
        [rtype] => W
    )

[3] => stdClass Object
    (
        [lid] => 2492
        [post_title] => Winter League 2012/2013
        [eid] => 2123
        [etitle] => e 2013
        [rid] => 2362
        [rtitle] => eircom2013_men_5mile
        [rtype] => M
    )

and i want to 'get' the subset of 'rid' values

 (2358,2359,1360,2362)

which of array manipulation functions should i use?

Mike Brant · Accepted Answer · 2013-03-13 19:51:26Z

4

I would suggest array_map().

$original_array; // your original array
$rid_array = array_map(function($val) {
    return $val->rid;
}, $original_array);

Or for PHP < 5.3

$original_array; // your original array
$rid_array = array_map('map_function', $original_array);

function map_function($val) {
    return $val->rid;
}

edited Mar 13, 2013 at 19:51

answered Mar 5, 2013 at 19:18

Mike Brant

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4 Comments

None Over a year ago

I believe he's looking to set them. Not get them.

Mike Brant Over a year ago

I kind of took it as a typo in imprecise language issue, as the values shown are the same as those currently in the array of objects. So read it to mean, he wanted to set an array with the values rid values from the array of objects.

emeraldjava Over a year ago

Is the callback function supported in PHP version 5.2.17?

Mike Brant Over a year ago

@emeraldjava You need to be on PHP 5.3 or greater to utilize closures (anonymous functions) as shown. See updated answer for compatibility with older versions of PHP.

None · Accepted Answer · 2013-03-05 19:19:55Z

1

I would use array_map() with a callback function that sets the rid field of the object.

function set_rid($obj, $val)
{
    return $obj->rid = $val;
}

$my_rids = array(
    '1',
    '2',
    '3',
    '4'
);
array_map('set_rid', $my_array, $my_rids);

answered Mar 5, 2013 at 19:19

None

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1 Comment

emeraldjava Over a year ago

thanks - how to 'set' the values was going to be the next question

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