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run code in 150+ php & hhvm versions
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<?php $fieldsConfig = array("readOnly" => array("readOnly" => true), "params" => array("readOnly" => true), "modifiedFields" => array("readOnly" => true), "fieldsConfig" => array("readOnly" => true), );
based on A1IfM
Output for 5.4.0 - 7.1.0