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@ 2018-03-31T13:41:16Z

<?php

$category = array(
    '1' => 'Ctegory 1',
    '2' => 'Ctegory 2',
    '3' => 'Ctegory 3',
);


$explodeID = explode(',', '3,1');

foreach($category as $key => $value){
    
    if(in_array($key, $explodeID)){
        echo "$key => $value" . PHP_EOL;
    }
}

Output
Performance
VLD
References
Branches

explode: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive preview

58.43 ms | 402 KiB | 5 Q