44

I would like to list all posts that have a key of cp_annonceur with the value professionnel.

1
74

What you are asking for is a meta_query

$args = array(
   'meta_key' => 'custom-meta-key',
   'meta_query' => array(
       array(
           'key' => 'cp_annonceur',
           'value' => 'professionnel',
           'compare' => '=',
       )
   )
);
$query = new WP_Query($args);

All of the information you need is in the Codex.

5
  • 3
    @Beginner : if this solved the problem please mark it "Accepted". Look for the check mark near the vote arrows on the left.
    – s_ha_dum
    May 11 '14 at 20:35
  • 1
    For some reason using new WP_Query($args) and then calling get_posts doesn't work for me. Directly passing the $args array to the get_posts function as an argument works however.
    – Kunal
    May 5 '20 at 21:24
  • @Kunal You don't need to call get_posts. Use the code above, and get the posts like so: $query->posts. It should return an array. Don't forget to read the link in the comment, as there is something missing in the code: $args = array( 'post_type' => 'your-cpt', 'meta_key' => 'your-meta', 'meta_query' => array( array( 'key' => 'cp_annonceur', 'value' => 'professionnel', 'compare' => '=', ) ) ); $query = new WP_Query($args); Jan 14 '21 at 0:32
  • @s_ha_dum minor syntax correction - missing , after 'custom-meta-key'. Would have editied, but it's not possible to make a 1 character edit...
    – Steven
    Apr 29 '21 at 12:57
  • What's the difference between meta_key and key ? Jan 14 at 11:20
14

There are two ways to do that:

  1. Intercept the main query on pre_get_posts:

    add_action( 'pre_get_posts', function( $query )
    {
        // only handle the main query
        if ( ! $query->is_main_query() )
            return;
    
        $query->set( 'meta_key',   'cp_annonceur' );
        $query->set( 'meta_value', 'professionnel' );
    } );
    
  2. Add an additional query

    $second_loop = get_posts( array(
        'meta_key'   => 'cp_annonceur',
        'meta_value' => 'professionnel',
    ) );
    

A more throughout example can be found in this answer.

3
  • 2
    Nice to know the short way with get_posts() Jan 26 '17 at 16:06
  • How do you do this with multiple meta ket/values ?
    – G-J
    Apr 9 '20 at 22:57
  • @G-J you might want to take a look at this example.
    – kaiser
    Apr 15 '20 at 15:18
10

I used custom select (might be better performance)

$posts = $wpdb->get_results("SELECT * FROM $wpdb->postmeta
WHERE meta_key = 'cp_annonceur' AND  meta_value = 'professionnel' LIMIT 1", ARRAY_A);

Inspired from https://tommcfarlin.com/get-post-id-by-meta-value/

3
  • 6
    It might have better performances, but it throws away the whole idea of having Wordpress functions to search (and cache) data. And, also, what will happen if WP decides to change the table structure? :)
    – Erenor Paz
    Mar 3 '17 at 10:11
  • @ErenorPaz I understand what you are saying but this way would make it easy if you had multiple meta key/values as a criteria... Is there an official way to handle multiple criteria?
    – G-J
    Apr 9 '20 at 22:59
  • 2
    You mean something like WHERE metatable1.meta_key = 'cp_annonceur' AND metatable1.meta_value = 'professionnel' AND metatable2.meta_key = 'cp_other_meta' AND metatable2.meta_value = 'other_value'? (Note that i suppose we do a join on the same posts_meta table using two names metatable1 and metatable2). This can be achieved adding field meta_query (as an array) to the query. Take a look at: developer.wordpress.org/reference/classes/wp_query/… and go to paragraph "‘orderby’ with multiple ‘meta_key’s"
    – Erenor Paz
    Apr 10 '20 at 11:19
4

We can get the desired result with Meta query of the WordPress :

// the meta_key 'diplay_on_homepage' with the meta_value 'true'
$cc_args = array(
    'posts_per_page'   => -1,
    'post_type'        => 'post',
    'meta_key'         => 'cp_annonceur',
    'meta_value'       => 'professionnel'
);
$cc_query = new WP_Query( $cc_args );

For more detailed guide regarding meta query follow this blog : http://www.codecanal.com/get-posts-meta-values/

2
  • May i know why this post_per_page value is -1?
    – Abhay
    Apr 27 '18 at 5:07
  • 1
    @AbhayGawade You can limit max number of results using that parameter, -1 means no limit.
    – Kush
    Jun 20 '18 at 17:49
2

You can easily grab the posts using WordPress's built-in function called get_posts You can find more details about get_posts here https://developer.wordpress.org/reference/functions/get_posts/

$posts = get_posts(array(
    'numberposts'   => -1,
    'post_type'     => 'post',
    'meta_key'      => 'cp_annonceur',
    'meta_value'    => 'professionnel'
));
0

Try this, It's working for me

global $wpdb;
$meta_key = '_request_body';

$data = $wpdb->get_results($wpdb->prepare( "SELECT DISTINCT meta_value FROM $wpdb->postmeta WHERE meta_key = %s", $meta_key) , ARRAY_N  );

$result = [];
foreach($data as $array){
    $result[] = $array[0];
}

print_r($result);
1
  • That would list the distinct possible values, which isn't quite what the question asks for.
    – Rup
    Jan 20 '21 at 16:19

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