CustomIntegerType.php

namespace Doctrine\DBAL\Type;

use Doctrine\DBAL\Generator\SQL;
use Doctrine\DBAL\Platform\Platform;

class CustomIntegerType extends AbstractType implements Type
{
    public function generateType(Platform $platform)
    {
        $internalType = ($this->options['length'] > 10) ? 'BIGINT' : 'INT'; 
    
        $type = new SQL\Type($internalType);
        
        $type->setName('custom_integer');
        $type->setOptions([
            'nullable' => false,
            'default'  => 0,
        ]);
        
        return $type;
    }
    
    function convertDatabaseToValue($value)
    {
        return (int) $value;
    }
    
    function convertValueToDatabase($value)
    {
        return $value;
    }
}

IntegerType.php

namespace Doctrine\DBAL\Type;

use Doctrine\DBAL\Platform\Platform;

class IntegerType extends AbstractType implements Type
{
    public function generateType(Platform $platform)
    {
        return $this->platform->createIntegerType($this->options);
    }
    
    function convertDatabaseToValue($value)
    {
        return (int) $value;
    }
    
    function convertValueToDatabase($value)
    {
        return $value;
    }
}

Type.php

namespace Doctrine\DBAL\Type;

use Doctrine\DBAL\Platform\Platform;

interface Type
{
    function setOptions(Options $options);

    function generateType(Platform $platform);
    
    function convertDatabaseToValue($value);
    
    function convertValueToDatabase($value);
}