删除重复项并将重复项移动到多维数组的开头 php

Question

我正在为 csv 创建一个搜索功能。根据我的搜索结果，我想删除重复项，然后将重复项移动到数组的开头。

  Array
    (
        [0] => Array
        (
            [0] => COD 21
            [1] => 4567
            [2] => Robert Wahl
        )
    [1] => Array
        (
            [0] => RT 5
            [1] => 1234
            [2] => Robert Merrill
        )
    [2] => Array
        (
            [0] => XD 62
            [1] => 1653
            [2] => Robert Hill
        )
    [3] => Array
        (
            [0] => RT 5
            [1] => 1234
            [2] => Robert Merrill
        )
)

我有一个删除重复项的函数，但我不确定如何让它将重复值移动到数组的开头，并根据重复项最多的值对它们进行排序:

function arrayUnique($array) { 
    $aux_ini=array(); 
    $result=array(); 
    for($n=0;$n<count($array);$n++) 
    { 
        $aux_ini[]=serialize($array[$n]); 
    } 
    $mat=array_unique($aux_ini); 
    for($n=0;$n<count($array);$n++) 
    { 
        $result[]=unserialize($mat[$n]); 
    } 
    return $result; 
}

感谢任何帮助。

Answer 1

试试这个，

function array_multidimensional($array)
{
$serialized = array_map('serialize', $array);
$array = array_unique($serialized);
return array_intersect_key($array, $unique);
}

Answer 2

function arrayUnique($array) { 
    // count values
    $arr = array_count_values (array_map('serialize',$array)); 
    // sort in desc order
    arsort($arr);
    // take keys and restore array
    return array_map('unserialize',array_keys($arr));
}

Answer 3

function array_unique_ordered_by_duplicates($array)
{
  //serialize inner arrays
  $serialized = array_map('serialize', $array);
  //create an array indexed by the serialized values, with all keys having a value of 0
  $flipped = array_map(function($el){ 
        return 0; 
      },array_flip($serialized));
  //increment the count each time an element is encountered, thereby gicing duplicates a higher value
  foreach($serialized as $v){
    $flipped[$v]+=1;
  }
  //sort descending on the calculated value, putting the most duplicated items first
  arsort($flipped);
  //return unserialized, deduped, orded array
  return array_map('unserialize',array_keys($flipped));

}

请注意，splash58 是上面的一个更高效的版本，使用 php 的 array_count_values，应该改用

Answer 4

有点古怪，但我认为代码相对容易理解。

$csv = array(array('COD 21','4567','Robert Wahl')
            ,array('RT 5','1234','Robert Merrill')
            ,array('XD 62','1653','Robert Hill')
            ,array('RT 5','1234','Robert Merrill')
            );

echo "Begin...<br>\n";

$serials = array();
$dupeqty = array();
foreach ($csv as $csvkey => $csvdata)
{
  $dupekey = serialize($csvdata);

  if ( !isset($serials[$dupekey]) )
    $serials[$dupekey] = $csvkey;

  if ( !isset($dupeqty[$dupekey]) )
    $dupeqty[$dupekey] = 0;
  $dupeqty[$dupekey]++;
}

arsort($dupeqty);
foreach ($dupeqty as $dupekey => $times)
  echo $dupekey . " occurs $times times<br>\n";

flush();

echo "<br>\n";
echo "Accessing the original array...<br>\n";
foreach ($dupeqty as $dupekey => $times)
{
  $data = $csv[$serials[$dupekey]];
  echo '... data ' . $data[0] . ' ' . $data[1] . ' ' . $data[2] . "<br>\n";
}

运行它生成：

Begin...
a:3:{i:0;s:4:"RT 5";i:1;s:4:"1234";i:2;s:14:"Robert Merrill";} occurs 2 times
a:3:{i:0;s:5:"XD 62";i:1;s:4:"1653";i:2;s:11:"Robert Hill";} occurs 1 times
a:3:{i:0;s:6:"COD 21";i:1;s:4:"4567";i:2;s:11:"Robert Wahl";} occurs 1 times

Accessing the original array...
... data RT 5 1234 Robert Merrill
... data XD 62 1653 Robert Hill
... data COD 21 4567 Robert Wahl

删除重复项并将重复项移动到多维数组的开头 php

remove duplicates and move those that had duplicates to beginning of multi-dimensional array php

php

arrays

array-unique