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@ 2017-07-13T13:02:55Z

<?php
$array = ["subject" => "1"];
$json = json_encode($array);

$decoded = json_decode($json, true);

$subject = $decoded['subject'] ?? '';

$val = 0;
if ($subject === '') {
    $val = 5;
}

echo $val;

Output
Performance
VLD
References
Branches

json_decode: documentation ( source)
json_encode: documentation ( source)

preferences:dark modelive preview

47.39 ms | 402 KiB | 5 Q