<?php

require_once  './wp-load.php';

$new_post = array(
    'post_title' => 'My New Post',
    'post_content' => 'Lorem ipsum dolor sit amet...',
    'post_status' => 'publish',
    'post_date' => date('Y-m-d H:i:s'),
    'post_author' => '3',
    'post_type' => 'post'
);
$post_id = wp_insert_post($new_post);

var_dump($post_id); die; // Return  int(0)