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<?php var_dump( json_encode([ 'language' => ['cs', 'en'], 'userID' => [ 'modulo' => [ 'divisor' => 20, 'dividend' => 0, ] ] ]) );
based on 5e8Df
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
string(72) "{"language":["cs","en"],"userID":{"modulo":{"divisor":20,"dividend":0}}}"