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@ 2020-12-02T06:46:04Z

<?php

$arr1 = array(
        0 => ['product_type'=>'manufacturer','id'=>1], 
        1 => ['product_type'=>'manufacturer','id'=>2], 
        2 => ['product_type'=>'seller'], 
        3 => ['product_type'=>'seller'],
        4 => ['product_type'=>'seller'],
        5 => ['product_type'=>'seller'],
        6 => ['product_type'=>'seller'],
        7 => ['product_type'=>'manufacturer','id'=>3], 
    ) ;
    
    
function rearrange(&$arr, $n) 
{ 
     for ($i = 0; $i < $n; $i++) 
     {  
        $j = $i+1;
        if($arr[$i]['product_type'] =='manufacturer'){
            if($j%4!= 0){
                //echo $i;
                $temp = $arr[$i];
                $arr[$i] = $arr[$i + 1]; 
                $arr[$i + 1] = $temp;
            } else {
                if ($i==0 || $i==1 || $i==2) {
                  $temp = $arr[$i];
                  $arr[$i] = $arr[$i + 1]; 
                  $arr[$i + 1] = $temp;
                } else {
                  $temp = $arr[$i];
                  $arr[$i] = $temp;
                }
                
            }
        } else {
          $temp = $arr[$i];
          $arr[$i] = $temp;
        }
     } 
  
   
    return $arr;
} 
$keys    = array_keys ($arr1);
$n = count ($keys);
$arr = rearrange($arr1, $n); 
print_r($arr);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [product_type] => manufacturer [id] => 2 ) [1] => Array ( [product_type] => seller ) [2] => Array ( [product_type] => seller ) [3] => Array ( [product_type] => manufacturer [id] => 1 ) [4] => Array ( [product_type] => seller ) [5] => Array ( [product_type] => seller ) [6] => Array ( [product_type] => seller ) [7] => Array ( [product_type] => manufacturer [id] => 3 ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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