内爆()一个二维数组最简单的方法? [英] Easiest way to implode() a two-dimensional array?
问题描述
我是新来的PHP,并没有关于它的工作原理相当的抓地力。如果我有一个二维阵列本身(由数据库返回):
I'm new to PHP, and don't have quite the grip on how it works. If I have a two dimensional array as such (returned by a database):
array(3) {
[0]=> array(1) {
["tag_id"]=> string(1) "5"
}
[1]=> array(1) {
["tag_id"]=> string(1) "3"
}
[2]=> array(1) {
["tag_id"]=> string(1) "4"
}
}
和希望把它变成字符串 5,3,4
什么是不这样做的最快方法?我现在有一个讨厌的的foreach
循环,但希望它可以在同一行来完成。一个标准的破灭
给我数组,数组,数组
。
and want to turn it into the string 5,3,4
what would be the quickest way do do this? I currently have an obnoxious foreach
loop, but was hoping it could be done in one line. A standard implode
gives me Array,Array,Array
.
推荐答案
本使用修改阵列 array_map ,但可能为将其变成 TAG_ID
的的一维数组更好。然后,你可以使用破灭像正常的:
This modifies your array using array_map, but probably for the better by turning it into a 1D array of tag_id
's. Then you can just use implode like normal:
$arr = array_map(function($el){ return $el['tag_id']; }, $arr);
$str = implode(',', $arr);
如果你不想修改阵列比你可以这样做:
If you don't want to modify your array than you can just do this:
$str = implode(',', array_map(function($el){ return $el['tag_id']; }, $arr));
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