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@ 2019-12-06T14:00:19Z

<?php

$data = Array
(
     0  => Array
        (
             "id"  => 17,
             "drug"  => "Clobazam"
        ),

     1  => Array
        (
            "id" => 23,
            "drug" => "Dexametasona"
        ),

     2  => Array
        (
            "id" => 23,
            "drug" => "Diiodohidroxiquinoleína"
        ),

     3  => Array
        (
            "id" => 25,
            "drug" => "Diclofenac,dietilamina"
        )
        );

function collect_same_id(&$data){
        
        $tmp = [];
        $i = 0;
        foreach($data as $ind=>$rec){
          
             if(!array_key_exists($rec['id'],$tmp)){ 
                $tmp[$rec['id']] = $i;
                $i++;
            } else {
                $data[$tmp[$rec['id']]]['drug'] .= ', '.$rec['drug'];
                unset($data[$ind]); 
            } 
        }
        sort($data);
}

collect_same_id($data);

print_r($data);

Output for 7.1.26 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: Array ( [0] => Array ( [id] => 17 [drug] => Clobazam ) [1] => Array ( [id] => 23 [drug] => Dexametasona, Diiodohidroxiquinoleína ) [2] => Array ( [id] => 25 [drug] => Diclofenac,dietilamina ) )

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99.67 ms | 408 KiB | 5 Q