storing ID's in array in loop wordpress

Question

I have a strange situation.

I want to store the IDs from a wp_query in a variable.

So far i have the following:

    $loop = new WP_Query( array(
    'post_type'         => 'programma',
    'post_parent'       =>  0,
    'posts_per_page'    => -1,
    
) );
    if ( $loop->have_posts() ): 
    while ( $loop->have_posts() ) : $loop->the_post();
    $ids[] = get_the_ID();

Now the strange thing is: when i print_r($ids), i get the following:

Array ( [0] => 5404 ) 
Array ( [0] => 5404 [1] => 5307 )
Array ( [0] => 5404 [1] => 5307 [2] => 5308 )

Why is this? And how can i prevent this? I only want the last array to be stored.

@HowardE: yes print_r is in this case inside the loop, but i printed it outside the loop as well, same result. — Webdever
– Webdever, Commented Apr 28, 2021 at 12:13
@Bazaim: var_dump results in: array(1) { [0]=> int(5404) } array(2) { [0]=> int(5404) [1]=> int(5307) } array(3) { [0]=> int(5404) [1]=> int(5307) [2]=> int(5308) } — Webdever
– Webdever, Commented Apr 28, 2021 at 12:14

Obzi · Accepted Answer · 2021-04-28 12:31:51Z

1

If the print_ris inside the loop, you see the construction of your array.

You may only want to get list of ids:
https://developer.wordpress.org/reference/classes/wp_query/#return-fields-parameter

$ids = new WP_Query([
    'post_type'         => 'programma',
    'post_parent'       =>  0,
    'posts_per_page'    => -1,
    'fields'            => 'ids'
]);

answered Apr 28, 2021 at 12:31

Obzi

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1 Comment

Webdever Over a year ago

You are right, the error was(is) the print inside the loop.... Thanks!

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