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@ 2017-12-05T03:34:54Z

<?php
$array = [
    ['SC1MTTCS6J1WK'],
    ['SC1MTTCSHJ1WK']
];

$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
$flat = [];
foreach($it as $value) {
  $flat[] = $value;
}

echo implode(', ', $flat);

Output
Performance
VLD
References
Branches

implode: documentation ( source)

preferences:dark modelive previewkey bindings

139.66 ms | 404 KiB | 5 Q