我正在尝试使用api在我的网页上检索用户信息，但它不会返回任何信息。
Index.php：
<!DOCTYPE html>
<html>
<Head>
<title>IG LP</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</Head>
<center>
<body>
<img src = "http://i.imgur.com/Q38jJG9.png">
<center>
<p>See your profile information on the next page</p>
<form role="form" method="post" action="getuser.php">
<div class="form-group">
<font color="white">Instagram name:</font>
<input type="Text" id="username" name="username" placeholder="Your Instagram Name:">
<input type="submit" value="Submit" class="btn btn-primary btn-lg btn-block">
</div>
</form>
</center>
</body>
</html>
getuser.php：
<?PHP
$username = $_POST['username'];
// Add your own access token bellow to make this script work
$accesstoken = 'My Access token';
$apiurl = 'https://api.instagram.com/v1/users/search?q='.$username.'&access_token='.$accesstoken;
//API call to grab profile pic, username, bio, website, full name, and id
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $apiurl);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
$response = curl_exec($curl);
curl_close($curl);
$json = json_decode($response, true);
$pic = $json{'data'}[0]{'profile_picture'};
$username = $json{'data'}[0]{'username'};
$bio = $json{'data'}[0]{'bio'};
$website = $json{'data'}[0]{'website'};
$full_name = $json{'data'}[0]{'full_name'};
$id = $json{'data'}[0]{'id'};
// API call to grab Follows, Followed By, and amount of pics upload.
// Delete this if you don't need this info.
$apiurl = 'https://api.instagram.com/v1/users/'.$id.'/?access_token='.$accesstoken;
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $apiurl);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
$response = curl_exec($curl);
curl_close($curl);
$json = json_decode($response, true);
$pics = $json{'data'}{'counts'}{'media'};
$follows = $json{'data'}{'counts'}{'follows'};
$followed_by = $json{'data'}{'counts'}{'followed_by'};
?>
<!DOCTYPE html>
<html>
<Head>
<title>IG LP</title>
</Head>
<body>
<center>
<img src = "<?php echo $pic; ?>">
<p>Username: <?php echo $username; ?></p>
<p>Bio: <?php echo $bio; ?></p>
<p>Website: <?php echo $website; ?></p>
<p>Full Name: <?php echo $full_name; ?></p>
<p>ID: <?php echo $id; ?></p>
<p>Pics Uploaded: <?php echo $pics; ?></p>
<p>Following: <?php echo $follows; ?></p>
<p>Followed By: <?php echo $followed_by; ?></p>
</center>
</body>
</html>
如何在文本框中插入用户信息？