我需要数组问题的帮助。
首先，我有一个数组，就像你从sql查询中收到的一样：
$aRows=array(
array("one" => 1, "two" => 2, "three" => 3, "a" => "4", "b" => "lala"),
array("one" => 1, "two" => 2, "three" => 3, "a" => "5", "b" => "lolo"),
array("one" => 1, "two" => 2, "three" => 3, "a" => "6", "b" => "lili")
)
然后我有另一个定义层次结构的数组 - 让我们说
$aArray=array("one", "two", "three");
现在我想构建一个分层关联数组：
$newArray =
array(
"one" => array(
"two" => array(
"three" => array(
array("a" => "4", "b" => "lala"),
array("a" => "5", "b" => "lolo"),
array("a" => "6", "b" => "lili"),
)
)
)
);
想象一个"分组依据"sql，我想要分层表示。
编辑：在样本一，二，三包含相同的值，这在现实生活中并非如此 - 假设：
select one,two,three,a,b from a_table group by one,two,three;
当然，SQL会将等于一，二，三的值组合在一起，这些冗余信息是无用的。但是sql不能显示分层数据，所以字段是多余的。
编辑2：感谢Waygood，完整的解决方案是：
$aRows=array(
array("one" => 1, "two" => 2, "three" => 3, "a" => "4", "b" => "lala"),
array("one" => 1, "two" => 2, "three" => 4, "a" => "5", "b" => "lolo"),
array("one" => 1, "two" => 2, "three" => 4, "a" => "6", "b" => "lili")
);
$aArray=array("one", "two", "three");
$output=array();
foreach($aRows as $row)
{
$newKey = "";
foreach($aArray as $key) // loop through the hierarchy to get the fields names
{
eval('$exist = array_key_exists(''' . $row[$key] .
''', $output' . $newKey . ');');
if (!$exist)
{
$newKey .= "['" . $row[$key] . "']";
eval('$output' . $newKey . '=array();');
}
}
eval('$output' . $newKey . '[]=$row;');
}
echo(var_export($output, true));
如果要使用层次结构中指定的字段的 VALUES，您可以：
$output=array();
foreach($aRows as $row)
{
reset($aArray);
$eval='$output';
foreach($aArray as $key) // loop through the hierarchy to get the fields names
{
if(is_numeric($row[$key]))
{
$eval.='['.$row[$key].']'; // build the key based on the number $row value of each field named
}
else
{
$eval.='['''.$row[$key].''']'; // build the key based on the string $row value
}
unset($row[$key]); // remove the field from the $row
}
$eval.='=$row;';
eval($eval); // evaluate the built up index and set it to the remaining data
}