问Bing API相关搜索

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PHP Warning:  file_get_contents(https://api.cognitive.microsoft.com/bing/v7.0/search?responseFilter=RelatedSearches&q=iphone+case): failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden

<?php
$accessKey = 'abc123';
$endpoint = 'https://api.cognitive.microsoft.com/bing/v7.0/search';
$term = 'burrito recipe';

function BingWebSearch ($url, $key, $query) {
    $headers = "Ocp-Apim-Subscription-Key: $key\r\n";
    $options = array ('http' => array (
                        'header' => $headers,
                        'method' => 'GET'));
    $context = stream_context_create($options);
    $result = file_get_contents($url . "?q=" . urlencode($query) . "&responseFilter=RelatedSearches", false, $context);
    $headers = array();
    foreach ($http_response_header as $k => $v) {
        $h = explode(":", $v, 2);
        if (isset($h[1]))
            if (preg_match("/^BingAPIs-/", $h[0]) || preg_match("/^X-MSEdge-/", $h[0]))
                $headers[trim($h[0])] = trim($h[1]);
    }
    return array($headers, $result);
}

if (strlen($accessKey) == 32) {
    print "Searching the Web for: " . $term . "\n";
    list($headers, $json) = BingWebSearch($endpoint, $accessKey, $term);
    print "\nRelevant Headers:\n\n";
    foreach ($headers as $k => $v) {
        print $k . ": " . $v . "\n";
    }
    print "\nJSON Response:\n\n";
    echo json_encode(json_decode($json), JSON_PRETTY_PRINT);

} else {
    print("Invalid Bing Search API subscription key!\n");
    print("Please paste yours into the source code.\n");
}
?>