多维数组到PHP中的嵌套多维数组
我有这样一个数组:多维数组到PHP中的嵌套多维数组,php,arrays,Php,Arrays,我有这样一个数组: sid sname did dname 1 Basketball 1 Mini 1 Basketball 3 Cadet 2 Baseball 8 Little Leagu
sid sname did dname
1 Basketball 1 Mini
1 Basketball 3 Cadet
2 Baseball 8 Little League
2 Baseball 6 Junior League
1 Basketball 5 Masters
array('Basketball' => array(
'id' => 1,
'divisions' => array(
1 => 'Mini',
3 => 'Cadet',
5 => 'Masters'
)
),
'Baseball' => array(
'id' => 2,
'divisions' => array(
8 => 'Little League',
6 => 'Junior League'
)
)
);
我试图得到它并将其转换为嵌套数组,如下所示:
sid sname did dname
1 Basketball 1 Mini
1 Basketball 3 Cadet
2 Baseball 8 Little League
2 Baseball 6 Junior League
1 Basketball 5 Masters
array('Basketball' => array(
'id' => 1,
'divisions' => array(
1 => 'Mini',
3 => 'Cadet',
5 => 'Masters'
)
),
'Baseball' => array(
'id' => 2,
'divisions' => array(
8 => 'Little League',
6 => 'Junior League'
)
)
);
我使用的这个foreach循环不起作用,它替换了每个除法条目,所以我只剩下一个除法条目,这是最后一个条目
$result = '';
foreach($row as $r)
{
$result[$r['sname']] = array('id' => $r['sid'], 'divisions' => array($r['did'] => $r['dname']));
}
这个foreach循环给出了以下结果:
array('Basketball' => array(
'id' => 1,
'divisions' => array(
5 => 'Masters'
)
),
'Baseball' => array(
'id' => 2,
'divisions' => array(
6 => 'Junior League'
)
)
);
我不明白这里出了什么问题。。有人能帮我吗?检查是否存在具有isset或array\u key\u的密钥,这样就不会被重写。检查是否存在具有isset或array\u key\u的密钥,这样就不会被重写。我想:
$result[$r['sname']][] = array('id' => $r['sid'], 'divisions' => array($r['did'] => $r['dname']));
我想你想要:
$result[$r['sname']][] = array('id' => $r['sid'], 'divisions' => array($r['did'] => $r['dname']));
问题是每次都要重新定义$result[$r['sname']]。仅当尚未定义时才需要定义它
$result = array(); // initialize this to an appropriate type!
foreach($row as $r)
{
if(!isset($result[$r['sname']]))
{
$result[$r['sname']] = array('id' => $r['sid'], 'divisions' => array($r['did'] => $r['dname']));
continue;
}
$result[$r['sname']]['divisions'][$r['did']] = $r['dname'];
}
问题是每次都要重新定义$result[$r['sname']]。仅当尚未定义时才需要定义它
$result = array(); // initialize this to an appropriate type!
foreach($row as $r)
{
if(!isset($result[$r['sname']]))
{
$result[$r['sname']] = array('id' => $r['sid'], 'divisions' => array($r['did'] => $r['dname']));
continue;
}
$result[$r['sname']]['divisions'][$r['did']] = $r['dname'];
}
您当前所做的是覆盖$result[$r['sname']]的条目,因此其中只有一个数组
我使用if是因为$array[]=比array\u push快
您当前所做的是覆盖$result[$r['sname']]的条目,因此其中只有一个数组
我之所以使用if,是因为$array[]=比array_push快,假设它能工作,这是一个非常优雅的读法。当然,它每次都会重新初始化'id'值,但这并不昂贵。+1假设它可以工作,这是一个非常优雅的读取。当然,它每次都会重新初始化'id'值,但这并不昂贵。