Create WordPress Admin User from PHP

CreateWordpressUser.php

<?php
// ADD NEW ADMIN USER TO WORDPRESS
// ----------------------------------
// Put this file in your Wordpress root directory and run it from your browser.

$user = false;
$errors = array();

if( isset( $_POST ) ){

	$_POST = array_map("trim", $_POST);

	if( !isset( $_POST['username'] ) ){
		$errors['username'] = 'Username not set';
	}elseif( !$_POST['username'] ){
		$errors['username'] = 'Blank Username';
	}else{
		$user['username'] = $_POST['username'];
	}

	if( !isset( $_POST['email'] ) ){
		$errors['email'] = 'Email not set';
	}elseif( !$_POST['email'] ){
		$errors['email'] = 'Blank Email';
	}elseif( !filter_var( $_POST['email'] , FILTER_VALIDATE_EMAIL ) ){
		$errors['email'] = 'Invalid Email';
	}else{
		$user['email'] = $_POST['email'];
	}

	if( !isset( $_POST['password'] ) ){
		$errors['password'] = 'Password not set';
	}elseif( !$_POST['password'] ){
		$errors['password'] = 'Password Email';
	}elseif( strlen( $_POST['password'] )<8 || !preg_match( '/[A-Z]/' , $_POST['password'] ) || !preg_match( '/[a-z]/' , $_POST['password'] ) || !preg_match( '/\d/' , $_POST['password'] ) || !preg_match( '/\W/' , $_POST['password'] ) ){
		$errors['password'] = 'Weak Password - Requires at least 8 characters including one or more upper, lower, digit and other';
	}else{
		$user['password'] = $_POST['password'];
	}

}


if( $user && !$errors ){

	require_once('wp-blog-header.php');
	require_once('wp-includes/registration.php');

	// Check that user doesn't already exist
	if( username_exists( $user['username'] ) ){
		$errors['username'] = 'Username already in use';
	}
	if( email_exists( $user['email'] ) ){
		$errors['email'] = 'Email already in use';
	}
	
	if( !$errors ){

		// Create user and set role to administrator
		$user_id = wp_create_user( $user['username'] , $user['password'] ,  $user['email'] );

		if( !is_int( $user_id ) ){
			$errors['general'] = 'Error with wp_insert_user. No users were created.';
		}
		
		
		$wp_user_object = new WP_User( $user_id );
		$wp_user_object->set_role( 'administrator' );

		unlink(__FILE__);
	}

}

if( $user && !$errors ){

?>
<h1>User successfully created<h1>
<p>This file will now be automatically deleted, and you will be redirected to the <a href="./wp-admin/">Login Page</a> in 5 seconds.</p>
<script>
setTimeout(function(){document.location.href="./wp-admin/";},5000);
</script>
<?php
	die();
}

if( !$user || $errors ){

?>
<?php echo ( isset( $errors['general'] ) '<p>'.$errors['general'].'</p>' : '' ); ?>
<form method="post">
	<table>
		<tr><th>Username</th><td><input type="text" name="username" /><?php if( isset( $errors['username'] ) ? '<br>'.$errors['username'] : '' ); ?></td></tr>
		<tr><th>Email</th><td><input type="email" name="email" /><?php if( isset( $errors['email'] ) ? '<br>'.$errors['email'] : '' ); ?></td></tr>
		<tr><th>Password</th><td><input type="password" name="password" /><?php if( isset( $errors['password'] ) ? '<br>'.$errors['password'] : '' ); ?></td></tr>
		<tr><th colspan="2"><input type="submit" value="Create Admin User" /></th></tr>
	</table>
</form>
<?php	
}