Implement Fluent Interfaces for Expressive Code

class QueryBuilder
{
    private $table;
    private $conditions = [];

    public function from($table)
    {
        $this->table = $table;
        return $this;
    }

    public function where($condition)
    {
        $this->conditions[] = $condition;
        return $this;
    }

    public function build()
    {
        $query = "SELECT * FROM {$this->table}";
        if (!empty($this->conditions)) {
            $query .= " WHERE " . implode(' AND ', $this->conditions);
        }
        return $query;
    }
}

// Usage
$query = (new QueryBuilder())
    ->from('users')
    ->where('age > 18')
    ->where('status = "active"')
    ->build();