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@ 2021-08-10T18:58:25Z

<?php

   $a1 = array( 
               '0' =>
                  array(
                   'banner_details' =>
                     array(
                        'id' => 2,
                         'section_id' => 24
                     ),
                     'slide_details' =>
                     array(
                        0 => array(
                            'id' => 74,
                            'name' => 'Ads1' 
                        ),
                        1 => array(
                            'id' => 2,
                            'name' => 'Ads2' 
                        )
                     )
                     
                  ),
                  '1' =>
                  array(
                   'banner_details' =>
                     array(
                        'id' => 106,
                         'section_id' => 92
                     ),
                     'slide_details' =>
                     array(
                        0 => array(
                            'id' => 2001,
                            'name' => 'Adv1' 
                        ),
                        1 => array(
                            'id' => 2002,
                            'name' => 'Adv2' 
                        )
                     )
                     
                  )
               
            );

  $s = [];

    foreach($a1 as $data){
        if (isset($data['banner_details']['section_id'])){
            $s[$data['banner_details']['section_id']] = [];
             
            if (isset($data['slide_details'])){
                foreach($data['slide_details'] as $row){
                    $s[$data['banner_details']['section_id']][] = $row['id'];
                }
            }
        }
    }

print_r($s);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [24] => Array ( [0] => 74 [1] => 2 ) [92] => Array ( [0] => 2001 [1] => 2002 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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