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@ 2019-08-05T13:56:01Z

<?php

$a = Array
(
    'items' => Array
        (
            '0' => Array
                (
                    'sku' => 'SCB20',
                    'custom_attributes' => Array
                        (
                            '0' => Array
                                (
                                    'attribute_code' => 'ages',
                                    'value' => 17
                                ),

                            '1' => Array
                                (
                                    'attribute_code' => 'description',
                                    'value' => 'description data'
                                ),

                            '2' => Array
                                (
                                    'attribute_code' => 'image',
                                    'value' => 'cl2eojpu9.jpg'
                                )
                        )
                )
        )
);
$searchCode  = 'ages';
$attributeValue = '';
$flag = false;
array_walk_recursive($a, function($item, $key, &$flag) use ($searchCode,&$attributeValue){
   if($key == 'attribute_code' && $item == $searchCode){
      $flag = true;
   }
   if($flag){
    $attributeValue = $item;
   }
}, $flag);
echo $attributeValue;

array_walk_recursive: documentation ( source)

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