Get property names from PHP stdClass

Question

I have an array object that looks like:

$inDatabase = Array
(
    [0] => stdClass Object
        (
            [abc@gmail.com] => Array
                (
                )
        )
    [1] => stdClass Object
        (
            [xyz@gmail.com] => Array
                (
                )
        )
)

How do I push email addresses onto a new array? I tried the following:

$innerKeys =[];
$temp=[];
for($i=0;$i<2;$i++){
   $temp = array_keys($inDatabase[$i])

   //so I thought $temp[0] would have the email address but $temp is null.

   array_push($innerKeys,$temp[0]);

}

Why are you using email addresses as property names in the first place? — Barmar, Feb 12 '20 at 21:06
Does this answer your question? [PHP Print keys from an object?](https://stackoverflow.com/questions/5803881/php-print-keys-from-an-object) — Xhynk, Feb 12 '20 at 21:13

Barmar · Accepted Answer · 2020-02-12T21:13:40.613

2

array_keys() is for arrays. To turn the object properties into an array, use get_object_vars(). So you want

$temp = array_keys(get_object_vars($inDatabase[$i]));

DEMO

edited Feb 12 '20 at 21:13

answered Feb 12 '20 at 21:04

Barmar

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this produces no output. print_r($temp) is blank – DCR Feb 12 '20 at 21:06
1

I mistyped the array name, did you copy my mistake? – Barmar Feb 12 '20 at 21:08
BTW, why don't you use `foreach`? – Barmar Feb 12 '20 at 21:08

score 1 · Answer 2 · answered Feb 12 '20 at 21:04

1

You can use array_reduce(), get_object_vars(), and array_keys().

$emails = array_reduce($inDatabase, function ($arr, $obj) {
    return array_merge($arr, array_keys(get_object_vars($obj)));
}, []);

Working example: https://3v4l.org/IU3C9

answered Feb 12 '20 at 21:04

fubar

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AbraCadaver · Answer 3 · 2020-02-14T15:45:23.510

1

You can also just cast to an array and get the first key. I modified it a bit:

foreach($inDatabase as $o) {
   $innerKeys[] = array_keys((array)$o)[0];
}

However, since you want the first one, key (surprisingly) will work on an object:

foreach($inDatabase as $o) {
   $innerKeys[] = key($o);
}

Or much simpler:

$innerKeys = array_map('key', $inDatabase);

edited Feb 14 '20 at 15:45

answered Feb 12 '20 at 21:25

AbraCadaver

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Get property names from PHP stdClass

3 Answers3

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