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@ 2015-10-14T16:25:19Z

<?php
$allIcons = [];
foreach ($iconSet as $doc => $icons) {
    $allIcons[$doc] = isset($allIcons[$doc]) ? array_merge($allIcons[$doc], $icons) : $icons;
}

Output
Performance
VLD
References
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array_merge: documentation ( source)

preferences:dark modelive preview

55.78 ms | 402 KiB | 5 Q