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<?php function lambda_filter_empty($entry) { return ($entry !== ''); } $test = array( 'country_id' => '1', 'state' => '', 'city' => '', 'address1' => '', ); $result = array_keys(array_filter($test, "lambda_filter_empty")); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(10) "country_id" }

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