where clause in wordpress - php

Question

I want to generate few random links for my wordpress but i don't want to use order by rand as it will cause heavy load on mysql. below links works fine but when i use orderby rand
$wprpi_arg = array(
'numberposts' => $wprpi_value['post'],
'post__not_in' => array(get_the_ID()),
// 'where ID <' => get_the_ID(),
'orderby' => 'rand',
'post_status' => 'publish',
);
i want to use this instead
$wprpi_arg = array(
'numberposts' => $wprpi_value['post'],
'post__not_in' => array(get_the_ID()),
'where ID <' => get_the_ID(),
'orderby' => 'ID',
'post_status' => 'publish',
);
But this is not working. WordPress is listing only 5 last links of table as it is orderby id its showing 5 links in desc order.
But i want to generate 5 links lower than my current id.
For example: if users is on page /10000 the generated links should be 9999,9998,9997,9996,9995 and if user is on /100 page generated links will be 99,98,97,96,95 but wordpress ignores where clause and generates same link always orderby desc limit 5 without considering where clause

Answer 1

You can use custom where condition in your wordpress query as below.
Note: Use get_the_ID() instead of 215 in your case
//Add Filter
add_filter( 'posts_where' , 'posts_where_for_ID' );
function posts_where_for_ID( $where ) {
$where .= ' AND ID < '. 215;
return $where;
}
//Create args
$args = array(
'numberposts' => 5, //$wprpi_value['post']
'post__not_in' => array(215),
'orderby' => 'ID',
'order' => 'DESC',
'post_status' => 'publish',
'suppress_filters' => FALSE
);
//Get the posts
$desc_posts = get_posts($args);
//Store post ids
$p_ids = array();
foreach($desc_posts as $posts_) {
$p_ids[] = $posts_->ID;
}
//Your ids are here
var_dump($p_ids);
This will applied to all get_posts() query in which suppress_filters passed in args.
If you have custom post_type then ckeck for post type or if you have single page then add in that page only.