SQL WordPress Para filtrar posts

<?php

function getmakers(){

	$estado = $_POST['estado'];

	if(isset($estado)){

		$con = new PDO("mysql:host=localhost;dbname=nome_do_banco", "nome_do_usuario", "senha_do_usuario");
		$sql = "
		    SELECT wp0v_posts.*
		    FROM wp0v_posts, wp0v_postmeta
		    WHERE wp0v_posts.ID = wp0v_postmeta.post_id
		    AND wp0v_postmeta.meta_key = 'estados'
		    AND wp0v_postmeta.meta_value = '$estado'
		    AND wp0v_posts.post_status = 'publish'
		    AND wp0v_posts.post_type = 'representates'
		    AND wp0v_posts.post_date < NOW()
		    ORDER BY wp0v_posts.post_date DESC
		";
		$rs = $con->query($sql);
		$contador = $rs->num_rows;
		$registros = $rs->fetchAll();

		foreach ($registros as $atributo => $valor) {
			echo utf8_encode($valor['post_title']) . "<br>";
			echo utf8_encode($valor['post_content']) . "<br>";
		}

	}

}

getmakers();