[英]How can I sort an array by number of occurrence of its values?
I have the following array: 我有以下数组:
$name_arr = array('raj','raj','ganesh','rahul','ganesh','mayur','raj','rahul');
I want to sort it like this: 我想这样排序:
$final_arr = array('raj','raj','raj','ganesh','ganesh','rahul','rahul','mayur');
How can I achieve it? 我怎样才能实现它?
Simple way using array_count_values and arsort :- 使用array_count_values和arsort的简单方法: -
$array = array_count_values($name_arr); //get all occurrences of each values
arsort($array);
print_r($array);//print occurrences array
$final_array = array();
foreach($array as $key=>$val){ // iterate over occurrences array
for($i=0;$i<$val;$i++){ //apply loop based on occurrences number
$final_array[] = $key; // assign same name to the final array
}
}
print_r($final_array); // print final array
Output:- https://eval.in/847428 输出: - https://eval.in/847428
simple use array_count_values
and array_fill
and array_merge
简单地使用
array_count_values
和array_fill
以及array_merge
1st : array_count_values will get the values presented count as a array like below . 1st: array_count_values会将显示的值计为如下所示的数组。
Array ( [raj] => 3 [ganesh] => 2 [rahul] => 2 [mayur] => 1 )
2nd : Apply arsort() . 第二名:申请arsort()。 descending order, according to the value
降序,根据值
3rd : Loop that array and make the new array based on count fill the array using array_fill . 3rd:循环该数组并使基于count的新数组使用array_fill填充数组。
4th : Then merge the array . 第四:然后合并数组。
<?php
$name_arr = array('raj','raj','ganesh','rahul','ganesh','mayur','raj','rahul');
$new_arr = array_count_values($name_arr);
arsort($new_arr);
$value=array();
foreach($new_arr as $key=>$val){
$value= array_merge($value,array_fill(0,$val,$key));
}
print_r($value);
?>
The easiest way to solve this is by using the built-in functions array_count_values()
and usort()
: 解决这个问题的最简单方法是使用内置函数
array_count_values()
和usort()
:
<?php
$name_arr = array('raj','raj','ganesh','rahul','ganesh','mayur','raj','rahul');
$valueCount = array_count_values($name_arr);
$final_arr = $name_arr;
usort($final_arr, function ($a, $b) use ($valueCount) {
return $valueCount[$b] - $valueCount[$a];
});
var_dump($final_arr);
For reference, see: 供参考,请参阅:
For an example, see: 有关示例,请参阅:
<?php
$name_arr = array('raj','raj','ganesh','rahul','ganesh','mayur','raj','rahul');
rsort($name_arr);
print_r($name_arr);
Output 产量
Array (raj , raj , raj , rahul , rahul, mayur, ganesh, ganesh )
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