PHP - 根据字段的值除以一个多维数组 [英] PHP - Divide a multidimensional array depending on a field's value
问题描述
我有一个初步的数组:
$ arr0 =阵列(
0 =>阵列(
'A'=> 1,
'B'=> 1
)
1 =>阵列(
'A'=> 2,
'B'=> 1
)
2 =>阵列(
'A'=> 3,
'B'=> 2
)
3 =>阵列(
'A'=> 4,
'B'=> 3
)
4 =>阵列(
'A'=> 5,
'B'=> 3
)
);
我希望把它分成不同的阵列取决于其成员B'字段的值',像这样:
// $ ARR1包含$ arr0 [0]和$ arr0 [1],因为他们的'B'的值是1。
$ ARR1 =阵列(
0 =>阵列(
'A'=> 1,
'B'=> 1
)
1 =>阵列(
'A'=> 2,
'B'=> 1
)
);// $ ARR2含有$ arr0 [2],因为它的B的值是2。
$ ARR2 =阵列(
0 =>阵列(
'A'=> 3,
'B'=> 2
)
);// $ ARR3含有$ arr0 [3]和$ arr0 [4],因为它们的b的值是3。
$ ARR3 =阵列(
0 =>阵列(
'A'=> 4,
'B'=> 3
)
1 =>阵列(
'A'=> 5,
'B'=> 3
)
);
现在,本场B可以拥有价值的自然数,所以它并不总是导致3阵列,我会需要的。
我已经找到了相关的问题(和答案)<一个href=\"http://stackoverflow.com/questions/1019076/how-to-search-by-key-value-in-a-multidimensional-array-in-php\">here,但我的问题是具体的,因为我事先不知道什么原始值'B'有吗,怎么不同的值多有。
任何想法?
(编辑:$ ARR3被写成$ ARR1)
的foreach($ arr0为$值){
$ {常用3。 $值[B]} [] = $价值;
}
// $ ARR1,$ ARR2和$ ARR3定义
有在第二线,建立动态的变量名法宝。然而,编程的那种方式实在是笨拙的;你会做的更好,使结果到另一个阵列,像这样的:
的foreach($ arr0为$值){
$ allarr [$值['B'] [] = $价值;
}
// $ allarr定义
I have an initial array:
$arr0 = array(
0 => array(
'a' => 1,
'b' => 1
)
1 => array(
'a' => 2,
'b' => 1
)
2 => array(
'a' => 3,
'b' => 2
)
3 => array(
'a' => 4,
'b' => 3
)
4 => array(
'a' => 5,
'b' => 3
)
);
I wish to divide it into separate arrays depending on its members' value of the field 'b', like so:
// $arr1 contains $arr0[0] and $arr0[1] because their value of 'b' is 1.
$arr1 = array(
0 => array(
'a' => 1,
'b' => 1
)
1 => array(
'a' => 2,
'b' => 1
)
);
// $arr2 contains $arr0[2] because its value of 'b' is 2.
$arr2 = array(
0 => array(
'a' => 3,
'b' => 2
)
);
// $arr3 contains $arr0[3] and $arr0[4] because their value of 'b' is 3.
$arr3 = array(
0 => array(
'a' => 4,
'b' => 3
)
1 => array(
'a' => 5,
'b' => 3
)
);
Now, the field 'b' can have any natural number for value, so it is not always three resulting arrays that I will need.
I have found a related question (and answers) here, but my problem is specific because I don't know in advance what original values 'b' has, and how many of different values there are.
Any ideas?
(edit: $arr3 was written as $arr1)
foreach ($arr0 as $value) {
${"arr" . $value['b']}[] = $value;
}
// $arr1, $arr2 and $arr3 are defined
There is magic in the second line, which dynamically builds a variable name. However, that way of programming is really unwieldy; you would do better to make the results into yet another array, like this:
foreach ($arr0 as $value) {
$allarr[$value['b']][] = $value;
}
// $allarr is defined
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