code

<?php
    $url = "https://covid19dashboard.cdc.gov.tw/dash3";
    $resutlt1 = file_get_contents($url);
    $resutlt1_json = json_decode($resutlt1, true);
    print_r("確診: ".$resutlt1_json[0]["確診"]);

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $result2 = curl_exec($ch);
    $result2_json = json_decode($result2, true);
    print_r("\n送驗: ".$result2_json[0]["送驗"]);
    curl_close($ch);

result

確診: 467
送驗: 81,167

兩種方法自己挑

明明問問題簡潔有力，怎麼就不會敘述問題...

https://lmgtfy.com/?q=php+get+web+api+json

<?php
$data = file_get_contents('https://covid19dashboard.cdc.gov.tw/dash3');
print_r(json_decode($data,true));
// output: Array ( [0] => Array ( [確診] => 467 [解除隔離] => 441 [死亡] => 7 [送驗] => 81,167 [排除] => 80,105 [昨日確診] => 5 [昨日排除] => 320 [昨日送驗] => 344 ) )

如果你還問我說要怎麼處理 array 的資料的話....
請好好修習PHP吧！