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@ 2020-07-07T06:38:03Z

<?php

$json = '[{"name":null,"value":"","target":null,"alias":"brand","required":1,"showNull":0}]';
var_export(json_decode($json));
echo "\n---\n";

foreach (json_decode($json ?? '[]') as $row) {
    if ($row->alias === 'brand') {
        echo $row->value;
        break;
    }
}

Output
Performance
VLD
References
Branches

json_decode: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive preview

52.75 ms | 402 KiB | 5 Q