Php 如何分组数组而不创建新对象?
我有一个如下所示的数组:Php 如何分组数组而不创建新对象?,php,arrays,Php,Arrays,我有一个如下所示的数组: array (size=21) 0 => string '2' (length=1) 1 => string '' (length=0) 2 => string '20' (length=2) 3 => string '19' (length=2) 4 => string '14' (length=2) 5 => string '13' (length=2) 6 => string '' (lengt
array (size=21)
0 => string '2' (length=1)
1 => string '' (length=0)
2 => string '20' (length=2)
3 => string '19' (length=2)
4 => string '14' (length=2)
5 => string '13' (length=2)
6 => string '' (length=0)
7 => null
8 => null
9 => string '20' (length=2)
10 => null
11 => string '10' (length=2)
12 => string '' (length=0)
13 => null
14 => string '13' (length=2)
15 => null
16 => string '' (length=0)
17 => null
18 => null
19 => string '' (length=0)
20 => string '20' (length=2)
array (size=21)
0 => string '20' (length=2)
1 => string '13' (length=2)
...
我想通过将具有相同字符串的行分组,从这个数组创建一个新数组。e、 g
2=>字符串“20”(长度=2)与20=>字符串“20”(长度=2)和9=>字符串“20”(长度=2)
及
5=>字符串'13'(长度=2)与5=>字符串'13'(长度=2)
等等
并根据字符串出现的次数对新创建的数组行进行排序
顺序需要是从出现次数最多到最后的描述,就像一个经典的顶部图表(出现的字符串最多的是第一个,最少的是低的)
因此,修改后的数组将如下所示:
array (size=21)
0 => string '2' (length=1)
1 => string '' (length=0)
2 => string '20' (length=2)
3 => string '19' (length=2)
4 => string '14' (length=2)
5 => string '13' (length=2)
6 => string '' (length=0)
7 => null
8 => null
9 => string '20' (length=2)
10 => null
11 => string '10' (length=2)
12 => string '' (length=0)
13 => null
14 => string '13' (length=2)
15 => null
16 => string '' (length=0)
17 => null
18 => null
19 => string '' (length=0)
20 => string '20' (length=2)
array (size=21)
0 => string '20' (length=2)
1 => string '13' (length=2)
...
我还需要以某种方式处理空结果,例如,17=>null根本不包含在最终的数组修改结果中。这应该可以做到:
// Filter the "null results" first
$myarray = array_filter($myarray, create_function('$arg', '
return !is_null($arg);
'));
$occurrences = array_count_values($myarray);
// EDIT: arsort preserves the key => value correlation
arsort($occurrences, SORT_NUMERIC);
var_dump(array_keys($occurrences));
这应该可以做到:
// Filter the "null results" first
$myarray = array_filter($myarray, create_function('$arg', '
return !is_null($arg);
'));
$occurrences = array_count_values($myarray);
// EDIT: arsort preserves the key => value correlation
arsort($occurrences, SORT_NUMERIC);
var_dump(array_keys($occurrences));
试试这个
$result = array_count_values($a);
arsort($result);
$result = array_keys($result);
试试这个
$result = array_count_values($a);
arsort($result);
$result = array_keys($result);
看起来像一个作业,你自己试试看,问是否有问题。看起来像一个作业,你自己试试看,问是否有问题。谢谢,它输出这个:数组(大小=8)0=>int01=>int12=>int23=>int34=>int45=>int56=>int67=>int7是的,我的错。请稍等,我会解决问题并更新。谢谢,我想它会将它们正确分组,但我需要保留值,例如“20”、“13”等,并根据出现的情况重新排序。怎么做?编辑它。现在应该可以了。谢谢,它输出这个:数组(大小=8)0=>int01=>int12=>int23=>int34=>int45=>int56=>int67=>int7是的,我的错。请稍等,我会解决问题并更新。谢谢,我想它会将它们正确分组,但我需要保留值,例如“20”、“13”等,并根据出现的情况重新排序。怎么做?编辑它。现在应该没事了。