[英]sort array based on the dateTime in php
Array
(
[0] => Array
(
[dateTime] => 2011-10-18 0:0:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[1] => Array
(
[dateTime] => 2011-10-18 0:15:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[2] => Array
(
[dateTime] => 2011-10-18 00:14:00
[chanl1] => 20.7
[chanl2] => 33.8
[chanl3] =>
)
[3] => Array
(
[dateTime] => 2011-10-18 00:29:00
[chanl1] => 20.6
[chanl2] => 33.9
[chanl3] =>
)
I want to sort the above array based on the [dateTime], the final output should be: 我想基于[dateTime]对上述数组进行排序,最终输出应为:
Array
(
[0] => Array
(
[dateTime] => 2011-10-18 0:0:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[1] => Array
(
[dateTime] => 2011-10-18 00:14:00
[chanl1] => 20.7
[chanl2] => 33.8
[chanl3] =>
)
[2] => Array
(
[dateTime] => 2011-10-18 0:15:00
[chanl1] => 20.7
[chanl2] => 45.4
[chanl3] =>
)
[3] => Array
(
[dateTime] => 2011-10-18 00:29:00
[chanl1] => 20.6
[chanl2] => 33.9
[chanl3] =>
)
Is there anyone know how to do it? 有谁知道该怎么做? Thanks!
谢谢!
Use usort()
function with custom comparator: 将
usort()
函数与自定义比较器一起使用:
$arr = array(...);
usort($arr, function($a, $b) {
$ad = new DateTime($a['dateTime']);
$bd = new DateTime($b['dateTime']);
if ($ad == $bd) {
return 0;
}
return $ad < $bd ? -1 : 1;
});
DateTime class has overloaded comparison operators ( <
, >
, ==
). DateTime类具有重载的比较运算符(
<
, >
, ==
)。
Using uasort()
with a custom sort callback should do it: 将
uasort()
与自定义排序回调一起使用应该可以做到这一点:
function cmp($a, $b) {
if ($a['dateTime'] == $b['dateTime']) {
return 0;
}
return ($a['dateTime'] < $b['dateTime']) ? -1 : 1;
}
uasort($arr, 'cmp');
uasort()
preserves your array's keys, you can use usort()
instead if you don't need that to happen. uasort()
保留数组的键,如果不需要,可以使用usort()
代替。
For performance, this method using array_multisort is very efficient : 为了提高性能,这种使用array_multisort的方法非常有效 :
$ord = array();
foreach ($array as $key => $value){
$ord[] = strtotime($value['dateTime']);
}
array_multisort($ord, SORT_ASC, $array);
print_r($array);
For php array and object this example is helpful for sorting... 对于php数组和对象,此示例有助于排序...
For datetime descending: 对于日期时间降序:
usort($response_data['callback'], function($a, $b) {
return strcasecmp(strtotime($b->view_date), strtotime($a->view_date));
});
For datetime ascending: 对于日期时间升序:
usort($response_data['callback'], function($a, $b) {
return strtotime($a->view_date) - strtotime($b->view_date);
});
Use array_multisort : 使用array_multisort:
<?php
$myarray=array(
0 => array
(
'dateTime' => '2011-10-18 00:0:00',
'chanl1' => '20.7',
'chanl2' => '45.4',
'chanl3' => '',
),
1 => array
(
'dateTime' => '2011-10-18 00:15:00',
'chanl1' => '20.7',
'chanl2' => '45.4',
'chanl3' => '',
),
2 => array
(
'dateTime' => '2011-10-18 00:14:00',
'chanl1' => '20.7',
'chanl2' => '33.8',
'chanl3' => '',
),
3 => array
(
'dateTime' => '2011-10-18 00:29:00',
'chanl1' => '20.6',
'chanl2' => '33.9',
'chanl3' => ''
));
foreach($myarray as $c=>$key) {
$dateTime[] = $key['dateTime'];
$chanl1[] = $key['chanl1'];
$chanl2[] = $key['chanl2'];
$chanl3[] = $key['chanl3'];
}
array_multisort($dateTime,SORT_ASC,SORT_STRING,$myarray);
print_r($myarray);
Simple sorting for DateTime objects with the spaceship operator: 使用飞船运算符对DateTime对象进行简单排序:
$list = [
new DateTime('yesterday'),
new DateTime('today'),
new DateTime('1 week ago'),
];
uasort($list, function ($a, $b) {
return $a <=> $b;
});
var_dump($list);
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