<?php

use Doctrine\ORM\Tools\SchemaTool;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\ORM\Mapping as A;
use PHPSnippets\Db\Entity\Test;
use SqlFormatter;

/**
 * @A\Entity
 * @A\Table(name="budgie")
 */
class Budgie
{
    /**
     * @A\Column(type="integer")
     * @A\Id
     * @A\GeneratedValue(strategy="AUTO")
     */
    public $id;
    
    /**
     * @A\Column(type="string")
     */
    public $name;
}

$tool = new SchemaTool($entityManager);
$classes = array(
    $entityManager->getClassMetadata(Budgie::CLASS),
    $entityManager->getClassMetadata(Test::CLASS),
);

$queries = $tool->getCreateSchemaSql($classes);
echo 'createSchema($classes) does:' . PHP_EOL;
format_queries($queries);

$queries = $tool->getDropSchemaSQL($classes);
echo 'dropSchema($classes) does:' . PHP_EOL;
format_queries($queries);

// updateSchema($classes) creates a query to
// sync the differences between DB and Entity.
// That's why an update can be an create statement too
$queries = $tool->getUpdateSchemaSql($classes);
echo 'updateSchema($classes) does:' . PHP_EOL;
format_queries($queries);


function format_queries(array $queries) {
    foreach ($queries as $query) {
        echo trim(SqlFormatter::format($query));
    }
}

createSchema($classes) does:

CREATE TABLE budgie (
  id INT AUTO_INCREMENT NOT NULL, 
  name VARCHAR(255) NOT NULL, 
  PRIMARY KEY(id)
) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB

CREATE TABLE test (
  id INT AUTO_INCREMENT NOT NULL, 
  name VARCHAR(255) NOT NULL, 
  creation_date DATETIME DEFAULT NULL, 
  PRIMARY KEY(id)
) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB

dropSchema($classes) does:

DROP 
  TABLE test

updateSchema($classes) does:

CREATE TABLE budgie (
  id INT AUTO_INCREMENT NOT NULL, 
  name VARCHAR(255) NOT NULL, 
  PRIMARY KEY(id)
) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB

• Merging an object with EntityManager to change a attached entity
• Filtering a Doctrine collection that implements Selectable interface
• Validation of Doctrine ORM schema/metadata

PHP 7.3, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10