[英]How can I sort arrays alphabetically by using the second element in PHP
Would appreciate any help with this.:) 非常感谢任何帮助。:)
I have the following text file: 我有以下文本文件:
roomA Springer, Jerry js@email.com
roomB Cruise, Tom tc@email.com
roomC Jovi, Bon bj@email.com
and I want to sort it by the surname so it outputs: 我希望按姓氏对其进行排序,以便输出:
Cruise, Tom roomB tc@email.com
Jovi, Bon roomC bj@email.com
Springer, Jerry roomA js@email.com
I know how to load the file: 我知道如何加载文件:
$a = file("details.txt");
and think I have to use explode() to split up the data (tab-seperated): 并认为我必须使用explode()来分割数据(tab-seperated):
$array = explode("\t", $a);
this makes the name the second element in the array. 这使得名称成为数组中的第二个元素。
How do I put the string back together with the name coming first, followed by the room and email? 如何将字符串重新放在一起,首先是名字,然后是房间和电子邮件? Thanks.
谢谢。
Do a var_dump($array)
and it will display you the indexes. 执行
var_dump($array)
,它会显示索引。 You then only need to swap two elements with each other. 然后,您只需要互相交换两个元素。 Here is a trick:
这是一个技巧:
list($array[0], $array[1]) = array($array[1], $array[0]);
After that, you can implode
the result as you did explode
it: 之后,您可以在
explode
时implode
结果:
$line = implode("\t", $array);
Hope this is helpful. 希望这是有帮助的。 Ah well, and for sorting, take a look at
array_multisort
. 好吧,为了排序,看看
array_multisort
。
PHP不是这项工作的最佳工具。
awk -F"\t" '{print $2"\t"$1"\t"$3}' infile | sort > outfile
your data is not in a know format that i know .. the tabs
and space
between them are not constant ; 您的数据不是我知道的已知格式..它们之间的
tabs
和space
不是恒定的;
* Do not use in production .. i had to hack my way around * *不要在生产中使用..我不得不破解我的方式*
Try 尝试
$note = "roomA Springer, Jerry js@email.com
roomB Cruise, Tom tc@email.com
roomC Jovi, Bon bj@email.com";
$data = array();
$info = explode("\n", $note);
echo"<pre>" ;
foreach($info as $line)
{
$words = preg_split("/\\s/", $line);
$words = array_filter($words); // remove spaces
$words = array_values($words); // To reset the keys
$data[$words[1] . $words[2]] = $words[1] . $words[2] ."\t" . trim($words[0]) . "\t" . trim($words[3]) . "\n";
}
asort($data); //Sorting the data ;
print_r(array_values($data));
Output 产量
Array
(
[0] => Cruise,Tom roomB tc@email.com
[1] => Jovi,Bon roomC bj@email.com
[2] => Springer,Jerry roomA js@email.com
)
Advice 忠告
Use standard formats suvh as csv
, json
or xml
使用标准格式如
csv
, json
或xml
I would try improving it with preg_match 我会尝试使用preg_match来改进它
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