Wordpress consulta publicación única por slug

Para el momento en que quiero mostrar un solo post sin usar un bucle utilizo esto: 

<?php
$post_id = 54;
$queried_post = get_post($post_id);
echo $queried_post->post_title; ?>

El problema es que cuando muevo el sitio,los id suelen cambiar. ¿Hay alguna manera de consultar este post por slug?

Author: Jean-François Côté, 2013-02-20
Source

4 answers

Del Códice de WordPress: 

<?php
$the_slug = 'my_slug';
$args = array(
  'name'        => $the_slug,
  'post_type'   => 'post',
  'post_status' => 'publish',
  'numberposts' => 1
);
$my_posts = get_posts($args);
if( $my_posts ) :
  echo 'ID on the first post found ' . $my_posts[0]->ID;
endif;
?>

Codex de WordPress Obtener mensajes

 83
Author: ztirom,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2015-04-24 21:55:15

¿Qué tal?

<?php
   $queried_post = get_page_by_path('my_slug',OBJECT,'post');
?>
 53
Author: Mike Garcia,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2015-04-21 10:58:23

Un método menos costoso y reutilizable

function get_post_id_by_name( $post_name, $post_type = 'post' )
{
    $post_ids = get_posts(array
    (
        'post_name'   => $post_name,
        'post_type'   => $post_type,
        'numberposts' => 1,
        'fields' => 'ids'
    ));

    return array_shift( $post_ids );
}
 4
Author: Maarten Menten,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-04-03 09:39:29

Como la api de wordpress ha cambiado, no puedes usar get_posts con param 'post_name'. He modificado un poco la función Maartens: 

function get_post_id_by_slug( $slug, $post_type = "post" ) {
    $query = new WP_Query(
        array(
            'name'   => $slug,
            'post_type'   => $post_type,
            'numberposts' => 1,
            'fields'      => 'ids',
        ) );
    $posts = $query->get_posts();
    return array_shift( $posts );
}
 0
Author: Nurickan,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2018-01-30 10:26:38