php - 最佳实践 : returning multiple values

Question

从纯编码最佳实践的角度，建议采用什么作为大中型开发团队的标准？

返回一个顺序数组:

function get_results($filter) {
    $query = "SELECT SQL_CALC_FOUND_ROWS, * FROM ...";

    $results = ...
    $total = ...

    return array($results, $total);
}

返回一个关联数组:

function get_results($filter) {
    $query = "SELECT SQL_CALC_FOUND_ROWS, * FROM ...";

    $results = ...
    $total = ...

    return array(
        'resuts' => $results, 
        'total' => $total
    );
}

返回单个结果并通过引用分配第二个结果(？!):

function get_results($filter, &$count = null) {
    $query = "SELECT SQL_CALC_FOUND_ROWS, * FROM ...";

    $results = ...
    $total = ...

    $count = $total;
    return $results;
}

请随意提出任何其他方法。

Answer 1

来自 PHP 文档:

A function can not return multiple values, but similar results can be obtained by returning an array.

根据文档的说明，所有这些看起来都是很好的做法。 comment in the documentation揭示了另一种方式:使用 list()。请参见下面的示例:

function fn($a, $b)
{
   # complex stuff

    return array(
      $a * $b,
      $a + $b,
   );
}

list($product, $sum) = fn(3, 4);

echo $product; # prints 12
echo $sum; # prints 7