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@ 2015-12-25T06:16:16Z

<?php
$json = new stdClass;
$str = 'foo';
$abc = 'bar';
$json->$str = $abc;
echo $json->$str;
echo json_encode($json);

Output
Performance
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References
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json_encode: documentation ( source)

preferences:dark modelive preview

31.59 ms | 402 KiB | 5 Q