Update Post metafield of specific categories

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I have some meta fields in WordPress created by theme and i want to update it by using php.

The metafield stores url and i want to add some string after current url in custom meta.

i tried these method Assign/update the custom field value for all posts

and made changes

'post_category' => array(14,16,19);

to select a particular category but it edited all posts of all categories.

and used this method to change meta field but it removed url and changet field.

$dealcode = "&deal_code=coupon";
    $urlvalue = get_post_meta( $post->ID, 'metakey', false);
    $urlvalue = $urlvalue . $dealcode;
    update_post_meta( $post->ID, 'metakey', $urlvalue );

please can anyone fix this. Thanks.

I have some meta fields in WordPress created by theme and i want to update it by using php.

The metafield stores url and i want to add some string after current url in custom meta.

i tried these method Assign/update the custom field value for all posts

and made changes

'post_category' => array(14,16,19);

to select a particular category but it edited all posts of all categories.

and used this method to change meta field but it removed url and changet field.

$dealcode = "&deal_code=coupon";
    $urlvalue = get_post_meta( $post->ID, 'metakey', false);
    $urlvalue = $urlvalue . $dealcode;
    update_post_meta( $post->ID, 'metakey', $urlvalue );

please can anyone fix this. Thanks.

• post-meta

Share Improve this question edited Jun 5, 2018 at 5:36 fuxia♦ 107k3838 gold badges255255 silver badges459459 bronze badges asked Jun 5, 2018 at 5:11 MangalMangal 2355 bronze badges 1

• Is that meta assigned for posts or for categories? Could you show the rest of your code? It's pretty hard to guess, what exactly are you doing with that 'post_category' => array(14,16,19); – Krzysiek Dróżdż Commented Jun 5, 2018 at 6:47

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1 Answer 1

Sorted by: Reset to default 0

OK, so a little bit of guessing is involved in that answer, since you've posted only parts of your code, but... I assume that your code looks like that:

$args = array(
    'post_type' => 'post',
    'post_status' => 'publish',
    'posts_per_page'   => -1,
    'post_category' => array(14,16,19)
);
$posts = get_posts($args);
foreach ( $posts as $post ) {
    $dealcode = "&deal_code=coupon";
    $urlvalue = get_post_meta( $post->ID, 'metakey', false);
    $urlvalue = $urlvalue . $dealcode;
    update_post_meta( $post->ID, 'metakey', $urlvalue );
}

If so, then the problem lies in this line:

'post_category' => array(14,16,19);

There is no post_category argument for WP_Query...

The correct argument is category__in, so your code should look like this:

$args = array(
    'post_type' => 'post',
    'post_status' => 'publish',
    'posts_per_page'   => -1,
    'category__in' => array(14,16,19)
);
$posts = get_posts($args);
foreach ( $posts as $post ) {
    $dealcode = "&deal_code=coupon";
    $urlvalue = get_post_meta( $post->ID, 'metakey', false);
    $urlvalue = $urlvalue . $dealcode;
    update_post_meta( $post->ID, 'metakey', $urlvalue );
}

PS. Since you only use IDs, there is no point in getting whole posts. It would be much more efficient if you used fields => 'ids' in your query.

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