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@ 2017-04-20T15:57:52Z

<?php
$arr = Array
(
    0 => Array
        (
            'template_id' => 1,
            'template_field_id' => 20
        ),

    1 => Array
        (
            'template_id' => 1,
            'template_field_id' => 21
        ),

    2 => Array
        (
            'template_id' => 2,
            'template_field_id' => 22
        ),

    3 => Array
        (
            'template_id' => 2,
            'template_field_id' => 23
        )

);

$resultArr = array();
foreach($arr as $data){
  $index = array_search($data['template_id'], array_column($resultArr, 'id'));
  if($index !== false){
      if(is_array($resultArr[$index]["template_fields"]))
         array_push($resultArr[$index]["template_fields"],array("id"=>$data["template_field_id"]));
      else
         $resultArr[$index]["template_fields"] = array(array("id"=>$data["template_field_id"]));
              
    }else{
         $newData = array("id"=>$data['template_id'],"template_fields"=>array(array("id"=>$data["template_field_id"])));
         array_push($resultArr,$newData);
    }  
  
}
print_r($resultArr);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [id] => 1 [template_fields] => Array ( [0] => Array ( [id] => 20 ) [1] => Array ( [id] => 21 ) ) ) [1] => Array ( [id] => 2 [template_fields] => Array ( [0] => Array ( [id] => 22 ) [1] => Array ( [id] => 23 ) ) ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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