我有一个意想不到的结果。
$ccpmail[] =
array(
"mail_id"=>$evemailheader["mail_id"],
"is_read"=>$evemailheader['is_read'],
"fromid"=>$evemailheader['from'],
"fromname"=>$character_names[get_character_name($evemailheader['from'], $character_names)]['character_name'],
"subject"=>$evemailheader['subject'],
"labels"=>array("EVE Online"),
'datestamp'=>strtotime($evemailheader['timestamp']),
'date'=>$date
);
$email[] =
array(
"mail_id"=>$mailid,
"is_read"=>$is_read,
"fromid"=>$message_parsed->getHeaderValue('from'),
"fromname"=>$message_parsed->getHeader('from')->getPersonName(),
"subject"=>$message_parsed->getHeaderValue('subject'),
"labels"=>array("E-mail"),
'datestamp'=>strtotime($message_parsed->getHeaderValue('date')),
'date'=>$date->format('Y-m-d H:i:s')
);
$allmail = array_merge($ccpmail, $email);
function sortByOrder($a, $b) {
return $a['datestamp'] < $b['datestamp'];
}
usort($allmail, 'sortByOrder');
var_dump($allmail);
结果在:
array(133) {
[0]=>
array(8) {
["mail_id"]=>
string(32) "bcfc5f6b0365738e58c99e0501b37210"
["is_read"]=>
bool(true)
["fromid"]=>
string(22) "EMAIL"
["fromname"]=>
string(12) "NAME"
["subject"]=>
string(4) "tset"
["labels"]=>
array(1) {
[0]=>
string(6) "E-mail"
}
["datestamp"]=>
int(1485509147)
["date"]=>
string(19) "2017-01-27 09:25:47"
}
[1]=>
array(8) {
["mail_id"]=>
string(32) "317c556f35213548598f0bb838a237c1"
["is_read"]=>
bool(true)
["fromid"]=>
string(22) "EMAIL"
["fromname"]=>
string(12) "NAME"
["subject"]=>
string(5) "etest"
["labels"]=>
array(1) {
[0]=>
string(6) "E-mail"
}
["datestamp"]=>
int(1485509066)
["date"]=>
string(19) "2017-01-27 09:24:26"
}
[2]=>
array(8) {
["mail_id"]=>
int(364172046)
["is_read"]=>
bool(false)
["fromid"]=>
int(90766569)
["fromname"]=>
string(13) "NAME"
["subject"]=>
string(2) "hi"
["labels"]=>
array(1) {
[0]=>
string(10) "EVE Online"
}
["datestamp"]=>
int(1485507000)
["date"]=>
object(DateTime)#3 (3) {
["date"]=>
string(26) "2017-01-27 08:50:00.000000"
["timezone_type"]=>
int(2)
["timezone"]=>
string(1) "Z"
}
}
[3]=>
array(8) {
["mail_id"]=>
int(364160956)
["is_read"]=>
bool(true)
["fromid"]=>
int(793110520)
["fromname"]=>
string(10) "NAME"
["subject"]=>
string(30) "theres no brakes on this train"
["labels"]=>
array(1) {
[0]=>
string(10) "EVE Online"
}
["datestamp"]=>
int(1485455100)
["date"]=>
object(DateTime)#7 (3) {
["date"]=>
string(26) "2017-01-26 18:25:00.000000"
["timezone_type"]=>
int(2)
["timezone"]=>
string(1) "Z"
}
}
[4]=>
array(8) {
["mail_id"]=>
int(364160959)
["is_read"]=>
bool(true)
["fromid"]=>
int(793110520)
["fromname"]=>
string(10) "NAME"
["subject"]=>
string(10) "safe word?"
["labels"]=>
array(1) {
[0]=>
string(10) "EVE Online"
}
["datestamp"]=>
int(1485455100)
["date"]=>
object(DateTime)#5 (3) {
["date"]=>
string(26) "2017-01-26 18:25:00.000000"
["timezone_type"]=>
int(2)
["timezone"]=>
string(1) "Z"
}
}
[5]=>
array(8) {
["mail_id"]=>
int(364160957)
["is_read"]=>
bool(true)
["fromid"]=>
int(1228369447)
["fromname"]=>
string(7) "NAME"
["subject"]=>
string(4) "spam"
["labels"]=>
array(1) {
[0]=>
string(10) "EVE Online"
}
["datestamp"]=>
int(1485455100)
["date"]=>
object(DateTime)#6 (3) {
["date"]=>
string(26) "2017-01-26 18:25:00.000000"
["timezone_type"]=>
int(2)
["timezone"]=>
string(1) "Z"
}
}
[6]=>
array(8) {
["mail_id"]=>
int(364160934)
["is_read"]=>
bool(true)
["fromid"]=>
int(94312752)
["fromname"]=>
string(19) "NAME"
["subject"]=>
string(4) "spam"
["labels"]=>
array(1) {
[0]=>
string(10) "EVE Online"
}
["datestamp"]=>
int(1485455040)
["date"]=>
object(DateTime)#11 (3) {
["date"]=>
string(26) "2017-01-26 18:24:00.000000"
["timezone_type"]=>
int(2)
["timezone"]=>
string(1) "Z"
}
}
如您所见,数组没有像我想要的那样排序。我想要顶部的最低时间戳。谁能帮我?
如果使用 PHP7 或更高版本,则可以使用宇宙飞船运算符,如下所示:
function sortByOrder($a, $b) {
return $a['datestamp'] <=> $b['datestamp'];
}
这将根据需要对其进行排序。如果不使用 PHP7 或更高版本,则必须进行一些 if 语句以查看它是更高、更低还是相等。
比较函数需要返回一个大于、小于或等于零的整数才能正确排序。(请参阅此处value_compare_func
的定义。此表达式:
return $a['datestamp'] < $b['datestamp'];
将仅返回 true
或 false
(1 或 0,),这两个值都不是在较早的时间戳之前对较早的时间戳进行排序的正确值 (-1)。
您可以再添加一个比较,以便正确排序所需的值。
function sortByOrder($a, $b) {
if ($a['datestamp'] < $b['datestamp']) return -1; // return -1 if $a is earlier
return $a['datestamp'] > $b['datestamp']; // return 1 if $a is later, or 0 if equal
}
正如另一个答案所指出的,如果你使用的是 PHP 7,有一个运算符 ( <=>
) 可以让你用一个语句来做到这一点。