对齐

如果同一个内容要换行或有多个值，一般以操作符为左边界进行对齐。如：

§ 数组

$arr = array(
            key1 => val1,
            key2 => val2,
            key3 => val3,
            key4 => val4
);

§ 双元运算符? ：的对齐

$var = condition ? 1 : 2;
$var = condition
? long statement
: another long statement;

§ SQL语句的对齐

$sql = "SELECT field, field
            FROM table
            LEFT JOIN table2 ON condition
            WHERE condition
            ORDER BY field asc
            LIMIT 1";