I accidentally a simple ORM for php

Model.php

<?php
class Model {
 	public $limit;
	public $order_by;
	public $query_properties = array();
	
	public function __call($name, $arguments)
	{
		if (property_exists(__CLASS__, $name)) {
			$this->$name = $arguments[0];
		}
		else {
			$this->query_properties[$name] = $arguments[0];
		}
		return $this;
	}

	public function execute()
	{
		$model_name = get_class($this);
		$table_name = preg_replace('/model\_/', '', strtolower($model_name));
		$sql = 'SELECT * FROM ' . $table_name;

		$params = array();
		if ($this->query_properties) {
			$sql .= ' WHERE ';
			foreach ($this->query_properties as $field => $value) {
				$params[$field] = $value;
				$sql .= $field . ' = :' . $field . ' ';
			}
		}

		if ($this->order_by) {   
			$sql .= 'ORDER BY ' . $this->order_by . ' ';
		}

		if ($this->limit) {   
			$sql .= 'LIMIT ' . $this->limit;
		}

		$stmt = pdo()->prepare($sql);
		$stmt->setFetchMode(PDO::FETCH_CLASS | PDO::FETCH_PROPS_LATE, $model_name); 
		$stmt->execute($params);
		if ($this->limit === 1) {
			return $stmt->fetch();
		}
		return $stmt->fetchAll();
	}
}

Model_Round.php

<?php
/*
Sample model class to use

the sql table for this sample:

CREATE TABLE `round` (
  `round_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `account_id` int(11) unsigned NOT NULL,
  `question_id` int(11) unsigned NOT NULL,
  `date_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`round_id`)
) ENGINE=InnoDB AUTO_INCREMENT=25 DEFAULT CHARSET=latin1;
*/

class Model_Round extends Model {
	public $round_id;
	public $account_id;
	public $question_id;
	public $date_time;
}

You might be able to call this an ORM. You might even be able to get this code to compile. I was looking for an ORM to use in a new project. Turns out that is as easy as finding a decent framework for PHP. (Too many, steep learning curve, lots of setup, etc) I didn't find any. I started playing with PDO, and then its FETCH_CLASS fetch mode, and then classes, and then needed a quick way to query based off of id, and then I ended up with this.

This isn't complete of course. You can't do 'IS NOT null' queries, grouping, joins, etc. I might turn this in to a new repo some day where people can build from it. It may not work for you but it works for me.

Here is an example of how it is used:

$model = new Model_Round();
$round = $model->account_id($account_id)
            ->order_by('date_time DESC')
            ->limit(1)
            ->execute();