Get JSON to print empty array.

php arrays json actionscript-3 function

That is because your webserver version must be less than 5.4. You are trying to use a new feature of PHP 5.4 called the short array syntax

Use echo json_encode(array()); instead of echo json_encode( [] );

php arrays json actionscript-3 function

You have to use this:

if (!empty($output)){        echo json_encode( $output );}        else{            echo json_encode(array());        }

php arrays json actionscript-3 function

[] for arrays is only supported in php 5.4+.

So that means php is not a high enough version on your host, try asking them to upgrade to 5.4 or try array(); instead of []

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