Get MAX post ID from from wp_posts table


<?php
/* Get Max value from wp_posts */
global $wpdb;
$table_name = $wpdb->prefix . “posts”;
$post_ids = $wpdb->get_results(“SELECT MAX(ID) as max_id FROM $table_name”);

/* stdclass object to array in PHP */
foreach ($post_ids as $value)
$array[] = $value->max_id;
?>

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