Question

A有array喜欢这个

Array
(
    [0] => stdClass Object
        (
            [user_id] => 3035
            [category] => Preliminary
            [value] => 0
            [fullname] => 
            [studid] => 1202924
            [remarks] => 
        )

    [1] => stdClass Object
        (
            [user_id] => 3035
            [category] => Midterm
            [value] => 0
            [fullname] => 
            [studid] => 1202924
            [remarks] => 
        )

    [2] => stdClass Object
        (
            [user_id] => 3035
            [category] => Semi-Finals
            [value] => 0
            [fullname] => 
            [studid] => 1202924
            [remarks] => 
        )

    [3] => stdClass Object
        (
            [user_id] => 3035
            [category] => Finals
            [value] => 0
            [fullname] => 
            [studid] => 1202924
            [remarks] => 
        )

    [4] => stdClass Object
        (
            [user_id] => 3035
            [category] => Remedial
            [value] => 0
            [fullname] => 
            [studid] => 1202924
            [remarks] => 
        )

    [5] => stdClass Object
        (
            [user_id] => 3036
            [category] => Preliminary
            [value] => 0
            [fullname] => 
            [studid] => 1202925
            [remarks] => 
        )

    [6] => stdClass Object
        (
            [user_id] => 3036
            [category] => Midterm
            [value] => 0
            [fullname] => 
            [studid] => 1202925
            [remarks] => 
        )

    [7] => stdClass Object
        (
            [user_id] => 3036
            [category] => Semi-Finals
            [value] => 0
            [fullname] => 
            [studid] => 1202925
            [remarks] => 
        )

    [8] => stdClass Object
        (
            [user_id] => 3036
            [category] => Finals
            [value] => 0
            [fullname] => 
            [studid] => 1202925
            [remarks] => 
        )

    [9] => stdClass Object
        (
            [user_id] => 3036
            [category] => Remedial
            [value] => 0
            [fullname] => 
            [studid] => 1202925
            [remarks] => 
        )

我想像这样格式化它

Array
(
    [0] => Array
        (
            [fullname] => 
            [studid] => 1202924
            [user_id] => 3035
            [Preliminary] => 0
            [Midterm] => 0
            [Semi-Finals] => 0
            [Finals] => 0
            [Remedial] => 0
        ),
    [1] => array
         (
            [fullname] =>
            [studid] => 1202925
            [user_id] => 3036
            [preliminary] => 0
            [midterm] => 0
            [semi-finals] => 0
            [finals] => 0
            [remedial] => 0
         )
)

基本上按照studid或user_id

对它们进行分组

现在我尝试了许多尝试，比如

$count = 0;
$uid = $subject_student_grades[$count]->user_id;

for($x=0;$x < count($subject_student_grades);$x++)
{
    if($uid == $subject_student_grades[$x]->user_id)
    {
        $test[$count]['fullname'] = $subject_student_grades[$x]->fullname;
        $test[$count]['studid'] = $subject_student_grades[$x]->studid; 
        $test[$count]['user_id'] = $subject_student_grades[$x]->user_id; 
        $test[$count][$subject_student_grades[$x]->category] =      $subject_student_grades[$x]->value;
    }else{
        $count++;
    }
 }

和

$ count = 0; foreach（$ subject_student_grades为$ value） {

    $uid = $subject_student_grades[$count]->user_id;

    if($uid == $value->user_id)
    {
        $test[$count]['fullname'] = $value->fullname;
        $test[$count]['studid'] = $value->studid; 
        $test[$count]['user_id'] = $value->user_id; 
        $test[$count][$value->category] = $value->value;

    }else{
        $count++;
    }
}

但问题是它只循环第一部分带有0索引的部分，并且在条件停止后并且不处理或循环其余的部分，注意指出我做错了什么？

修改所以现在我编辑它并将计数放在foreach loop之外仍然是第一个array上的唯一迭代次数我认为在条件没有恢复之后？如果我删除else{}它会输出一个比我瞄准的更糟糕的阵列结构。

我尝试echo在其他地方发现了一些内容echo's我觉得这里的问题是在循环进入条件后它返回true然后继续到其他地方并且不回到if clause。

Answer 1

对于第二个循环中的$count，确实存在一个错误：

foreach($subject_student_grades as $value)
{
    $count = 0; //Why is that here?

这样，每次迭代都会覆盖$count到0，因此$test数组始终使用0进行处理，因此元素0将是那里唯一一个。

这应该是：

$count = 0;

foreach($subject_student_grades as $value)
{
    $uid = $subject_student_grades[$count]->user_id;

Answer 2

计数必须在循环之外：

$count = 0;
foreach($subject_student_grades as $value)
{
    $uid = $subject_student_grades[$count]->user_id;

    if($uid == $value->user_id)
    {
        $test[$count]['fullname'] = $value->fullname;
        $test[$count]['studid'] = $value->studid; 
        $test[$count]['user_id'] = $value->user_id; 
        $test[$count][$value->category] = $value->value;

    }

    $count++;
}

Answer 3

foreach的观点是，除了可能构建一个新数组之外，你不需要保持计数（但是你可以使用简写）。

我会这样做

$test = array();
foreach($subject_student_grades as $value) {
    $temp = array();
    $temp['fullname'] = $value->fullname;
    $temp['studid'] = $value->studid; 
    $temp['user_id'] = $value->user_id; 
    $temp[$value->category] = $value->value;

    $test[] = $temp; # This is shorthand to assign the next numerical index

}

if语句似乎是多余的，因为它阻止了count ++ when true，你的循环将完全不同步，因为foreach会自动向前移动，而你的计数不会是第一次，所以总是只有一个

对于/ Foreach循环在第一个条件下停止并且从不恢复

3 个答案: