Add a new post to WordPress from outside the dashboard with PHP

add-new-post.php

if( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_POST['action'] ) &&  $_POST['action'] == "update_form") {

	$membername = $_POST['membername'];
	if($_POST['title']){
		$post_title = $_POST['title'];
	} else {
		$post_title = 'update';
	}

	// ADD THE FORM INPUT TO $new_post ARRAY
	$new_post = array(
	'post_title'	=>	$post_title,
	'post_content'	=>	$update,
	'post_status'	=>	'publish',
	'post_type'	=>	'post',
	'member_name' => $membername,
	'tags_input' => $membername
	);

	//SAVE THE POST
	$pid = wp_insert_post($new_post);

	add_post_meta($pid, 'author', $membername, true);
	add_post_meta($pid, 'post_title', $post_title, true);

	//REDIRECT TO THE NEW POST ON SAVE
	/*$link = get_permalink( $pid );
	wp_redirect( $link );*/

} // END THE IF STATEMENT THAT STARTED THE WHOLE FORM

//POST THE POST YO
do_action('wp_insert_post', 'wp_insert_post');