我不知道该怎么做。
请参阅下面我的数组。
我在 while 循环中运行这个数组,需要先找到[attach_id]
对于每个[topic_id]
并可以使用$topic_id
在循环中设置的...
正确的输出将是:
第一个循环:
[attach_id] => 17989
(因为这是第一个attach_id
for topic_id 20890
)
and then
第二个循环:
[attach_id] => 17896
(因为这是第一个attach_id
for topic_id 20887
)
但我无法让它工作......
Array (
[0] => Array
(
[attach_id] => 17989
[post_msg_id] => 298566
[topic_id] => 20890
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 142437
[filetime] => 1442566541
[thumbnail] => 1
)
[1] => Array
(
[attach_id] => 17990
[post_msg_id] => 298566
[topic_id] => 20890
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 213432
[filetime] => 1442566541
[thumbnail] => 1
)
[2] => Array
(
[attach_id] => 17991
[post_msg_id] => 298566
[topic_id] => 20890
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 63320
[filetime] => 1442566541
[thumbnail] => 1
)
[3] => Array
(
[attach_id] => 17988
[post_msg_id] => 298566
[topic_id] => 20890
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 171560
[filetime] => 1442566540
[thumbnail] => 1
)
[4] => Array
(
[attach_id] => 17896
[post_msg_id] => 298546
[topic_id] => 20887
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 304056
[filetime] => 1441372805
[thumbnail] => 1
)
[5] => Array
(
[attach_id] => 17895
[post_msg_id] => 298546
[topic_id] => 20887
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 125938
[filetime] => 1441372804
[thumbnail] => 1
)
[6] => Array
(
[attach_id] => 17894
[post_msg_id] => 298546
[topic_id] => 20887
[extension] => jpg
[mimetype] => image/jpeg
[filesize] => 328378
[filetime] => 1441372785
[thumbnail] => 1
)
)
<?php
$attachTopicId = array();
foreach($array as $subArray) {
if (array_key_exists($subArray["topic_id"], $attachTopicId)) {
if ($attachTopicId[$subArray["topic_id"]] < $subArray["attach_id"]) {
$attachTopicId[$subArray["topic_id"]] = $subArray["attach_id"];
}
}
else {
$attachTopicId[$subArray["topic_id"]] = $subArray["attach_id"];
}
}
// test output
if (count($attachTopicId) > 0) {
foreach($attachTopicId as $key => $value) {
print sprintf("Topic ID: %s Attach ID: %s", $key, $value);
}
}
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