php - Use variable as value in array key value pair -


i using braintree payment processing , sending data swift app , instead of hardcoding amount, want dynamic based on product select. possible set value of key value pair dynamic variable coming php script? 

<?php  $price =  htmlentities($_request["price"]);  $tr_data = braintree_transparentredirect::transactiondata(                 array('redirecturl' => "http://" . $_server["server_name"] . ":" . $_server["server_port"] . parse_url($_server["request_uri"], php_url_path),                 'transaction' => array('amount' => $price, 'type' => 'sale'))) ?>


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