Problem in output value of a Object array nested inside a json

Hello everyone. please ive being battling with printing out a value from inside an array of a nested json. ive tried several ways its always returns index not define.
there is the code .

$valr= “https://ice3.com/api/v1/orderbook/ticker”; ////////////////////////////source

 $valrGet =  file_get_contents($valr);
 $valrD =  json_decode($valrGet, true);
 $valrSell = ["ask"] ["price"];

Here is the structure of the json from the source :
{“errors”:false,“response”:{“entities”:[{“pair_id”:3,“pair_name”:“BTC/ZAR”,“ask”:{“price”:“179382.54”,“amount”:“0.05357142”},“bid”:{“price”:“177229.4286563”,“amount”:“0.0011”}},{“pair_id”:4,“pair_name”:“BTC/NGN”,“ask”:{“price”:“8890000.00”,“amount”:“0.10”},“bid”:

my target is to output the value of (“price”) from “pair_name” BTC/ZAR

please help. thanks in advance

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