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run code in 150+ php & hhvm versions
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<? $out = array( 'suggestions' => null, ); echo json_encode($out);
Output for 5.4.0 - 7.1.0
{"suggestions":null}
Output for 4.3.0 - 5.3.29
<? $out = array( 'suggestions' => null, ); echo json_encode($out);