Question

I would like WordPress query to have a foreach in it.

$aid=0;
    foreach ($QA as $key => $value) {
    AND wp_postmeta.post_id IN (
        SELECT wp_postmeta.post_id
        FROM wp_postmeta, wp_posts
        WHERE wp_posts.ID = wp_postmeta.post_id
        AND wp_posts.post_status = 'publish'
        AND wp_posts.post_type = 'post'
        AND wp_postmeta.meta_key = '$key'
        AND wp_postmeta.meta_value = '$value'
    )
    $aid++;
}

But it’s not working that way, so I’m asking for help –

How I can put foreach in sql query?

Full example of code below.

<?php
 function query_products($QA) {

global $wpdb;
global $post;
global $pageposts;

$querystr = "

SELECT wp_posts.*, wp_postmeta.*
FROM wp_postmeta, wp_posts
WHERE wp_posts.ID = wp_postmeta.post_id
AND wp_posts.post_status = 'publish'
AND wp_posts.post_type = 'post'
AND wp_postmeta.meta_key = 'country'
AND wp_postmeta.meta_value = 'Denmark'

$aid=0;
    foreach ($QA as $key => $value) {
    AND wp_postmeta.post_id IN (
        SELECT wp_postmeta.post_id
        FROM wp_postmeta, wp_posts
        WHERE wp_posts.ID = wp_postmeta.post_id
        AND wp_posts.post_status = 'publish'
        AND wp_posts.post_type = 'post'
        AND wp_postmeta.meta_key = '$key'
        AND wp_postmeta.meta_value = '$value'
    )
    $aid++;
}

ORDER BY wp_postmeta.meta_value ASC 
    ";

$pageposts = $wpdb->get_results($querystr, OBJECT);

}

$QA = array (
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3',
);
query_products($QA);
?>

Answer 1

$querystr = "
SELECT wp_posts.*, wp_postmeta.*
FROM wp_postmeta, wp_posts
WHERE wp_posts.ID = wp_postmeta.post_id
AND wp_posts.post_status = 'publish'
AND wp_posts.post_type = 'post'
AND wp_postmeta.meta_key = 'country'
AND wp_postmeta.meta_value = 'Denmark'
";

$aid=0;
    foreach ($QA as $key => $value) {
       $querystr .= "
    AND wp_postmeta.post_id IN (
        SELECT wp_postmeta.post_id
        FROM wp_postmeta, wp_posts
        WHERE wp_posts.ID = wp_postmeta.post_id
        AND wp_posts.post_status = 'publish'
        AND wp_posts.post_type = 'post'
        AND wp_postmeta.meta_key = '$key'
        AND wp_postmeta.meta_value = '$value'";
    )
    $aid++;
}
$querystr .=" ORDER BY wp_postmeta.meta_value ASC";