Question

我尝试将同一组中的数组值替换为具有该值的数组但它无法正常工作，你可以在下面的代码中看到为什么？


function trace($val)
{
    echo "pre";
    print_r($val);
    echo "pre";
}
$rows = array(
                        array('a'=>'33333','b'=>'#3333','group'=>1),
                        array('a'=>'','b'=>'','group'=>1),
                        array('a'=>'','b'=>'','group'=>2),
                        array('a'=>'5555','b'=>'#werwe','group'=>2)
                        );
trace($rows);

$oldGroupId = -1;
        foreach($rows as &$row)
            foreach($row as $column=>$fieldValue)
            {
                    if($row['group']!=$oldGroupId)
                        ${$row['group']}[$column]=0;
                    if( !is_null( $row[$column]  ) )
                        ${$row['group']}[$column]=$row[$column];
                    //@ in this place try to point to my dynamick variable pointer for change if change value frome previuse all value in array cahnge
                    $row[$column] = & ${$row['group']}[$column];
            }

trace($rows);
?>

输出中的值：

Array
(
    [0] => Array
        (
            [a] => 33333
            [b] => #3333
            [group] => 1
        )

    [1] => Array
        (
            [a] => 
            [b] => 
            [group] => 1
        )

    [2] => Array
        (
            [a] => 
            [b] => 
            [group] => 2
        )

    [3] => Array
        (
            [a] => 5555
            [b] => #werwe
            [group] => 2
        )

)
Array
(
    [0] => Array
        (
            [a] => 
            [b] => 
            [group] => 1
        )

    [1] => Array
        (
            [a] => 
            [b] => 
            [group] => 1
        )

    [2] => Array
        (
            [a] => 5555
            [b] => #werwe
            [group] => 2
        )

    [3] => Array
        (
            [a] => 5555
            [b] => #werwe
            [group] => 2
        )

)

预期值：

Array
(
    [0] => Array
        (
            [a] => 33333
            [b] => #3333
            [group] => 1
        )

    [1] => Array
        (
            [a] => 33333
            [b] => #3333
            [group] => 1
        )

    [2] => Array
        (
            [a] => 5555
            [b] => #werwe
            [group] => 2
        )

    [3] => Array
        (
            [a] => 5555
            [b] => #werwe
            [group] => 2
        )

)

更新：

如果这不起作用，请告诉我另一种方法吗？

Answer 1

从

开始

$rows = array(
    array('a'=>'33333','b'=>'#3333','group'=>1),
    array('a'=>'','b'=>'','group'=>1),
    array('a'=>'','b'=>'','group'=>2),
    array('a'=>'5555','b'=>'#werwe','group'=>2)
);

创建一个临时变量来保存每个组的整体信息。

$groups = array();

然后将每个非空值添加到数组中。

foreach ($rows as &$row) {
    if (!isset($groups[$row['group']])) {
        $groups[$row['group']] = array();
    }
    $groups[$row['group']] += array_filter($row);
}

最后，用组的整体信息替换每一行。

foreach ($rows as &$row) {
    $row = $groups[$row['group']];
}

输出：See at Codepad

php数组中的问题用相同的组ID替换null值

1 个答案: