对php数组进行排序,并保留较小的时间重复元素
我在php中有以下数组$data对php数组进行排序,并保留较小的时间重复元素,php,arrays,sorting,date,duplicate-removal,Php,Arrays,Sorting,Date,Duplicate Removal,我在php中有以下数组$data Array ( [0] => Array ( [time] => 2014-12-01T00:00:00 [value] => 0.0107 ) [1] => Array ( [time] => 2014-12-01T0
Array
(
[0] => Array
(
[time] => 2014-12-01T00:00:00
[value] => 0.0107
)
[1] => Array
(
[time] => 2014-12-01T00:05:35
[value] => 0.0321
)
[2] => Array
(
[time] => 2014-12-01T00:05:35
[value] => 0.0107
)
[3] => Array
(
[time] => 2014-12-01T00:06:41
[value] => 0.0535
)
[4] => Array
(
[time] => 2014-12-01T00:06:41
[value] => 0.0107
)
[5] => Array
(
[time] => 2014-12-01T00:13:04
[value] => 0.0321
)
)
我使用以下代码对数组的数据进行排序,按日期填充数据:
$sortedData = array();
foreach ($data as $element) {
$timestamp = strtotime($element['time']);
$date = date("d.m.Y", $timestamp);
if ( ! isSet($sortedData[$date]) ) {
$sortedData[$date] = array($element);
} else {
$sortedData[$date][] = $element;
}
}
因此,结果是以下结构:
Array
(
[01.12.2014] => Array
(
[0] => Array
(
[time] => 2014-12-01T00:00:00
[value] => 0.0107
)
[1] => Array
(
[time] => 2014-12-01T00:05:35
[value] => 0.0321
)
[2] => Array
(
[time] => 2014-12-01T00:05:35
[value] => 0.0107
)
[3] => Array
(
[time] => 2014-12-01T00:06:41
[value] => 0.0535
)
[4] => Array
(
[time] => 2014-12-01T00:06:41
[value] => 0.0107
)
...
)
问题是数组包含的元素具有相同的时间但值不同。是否有办法过滤重复项(时间重复元素),以便只保留重复项中较小的(值)元素
所以我想要这样的东西(每个元素的索引是时间,值是前一个数组中复制的元素中较小的一个):
有什么办法吗?非常感谢 试试这个
$sortedDataHash = array();
foreach ($data as $element) {
$timestamp = strtotime($element['time']);
if (!isset($sortedDataHash[$timestamp])) {
$sortedDataHash[$timestamp] = $element;
} else {
$sortedDataHash[$timestamp] = $element['value'] < $sortedDataHash[$timestamp]['value']
? $element : $sortedDataHash[$timestamp];
}
}
$sortedData = array();
foreach ($sortedDataHash as $key => $val) {
$date = date("d.m.Y", $key);
if ( ! isSet($sortedData[$date]) ) {
$sortedData[$date] = array($val);
} else {
$sortedData[$date][] = $val;
}
}
$sortedDataHash=array();
foreach($data作为$element){
$timestamp=strottime($element['time']);
如果(!isset($sortedDataHash[$timestamp])){
$sortedDataHash[$timestamp]=$element;
}否则{
$sortedDataHash[$timestamp]=$element['value']<$sortedDataHash[$timestamp]['value']
?$element:$sortedDataHash[$timestamp];
}
}
$sortedData=array();
foreach($key=>$val){
$date=日期(“d.m.Y”,$key);
如果(!isSet($sortedData[$date]){
$sortedData[$date]=数组($val);
}否则{
$sortedData[$date][]=$val;
}
}
可能有更好的方法^-^ 这项工作很好:
$sortedData = array();
foreach ($data as $element) {
$timestamp = strtotime($element['time']);
$date = date("d.m.Y", $timestamp);
if ( ! isset($sortedData[$date][$element['time']]) ) {
$sortedData[$date][$element['time']] = $element;
$sortedData[$date][$element['time']]['lowest_value'] = $element['value'];
}
if ($sortedData[$date][$element['time']]['lowest_value'] > $element['value']) {
$sortedData[$date][$element['time']] = $element;
$sortedData[$date][$element['time']]['lowest_value'] = $element['value'];
}
}
如果要测试,请单击此处:
您已经完成了一个级别的分组,只需将几乎相同的技术再次应用于“按时间分组”而不是“按日期分组”,以及“替换”而不是“追加”。
$sortedData = array();
foreach ($data as $element) {
$timestamp = strtotime($element['time']);
$date = date("d.m.Y", $timestamp);
if ( ! isset($sortedData[$date][$element['time']]) ) {
$sortedData[$date][$element['time']] = $element;
$sortedData[$date][$element['time']]['lowest_value'] = $element['value'];
}
if ($sortedData[$date][$element['time']]['lowest_value'] > $element['value']) {
$sortedData[$date][$element['time']] = $element;
$sortedData[$date][$element['time']]['lowest_value'] = $element['value'];
}
}