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<p>我試圖使用php獲取國(guó)家代碼。我使用以下代碼，但是得到了這個(gè)警告：< <blockquote> <p>未定義的索引：country_code</p> </blockquote> <pre class="brush:php;toolbar:false;">function getIP($ip) { $curl = curl_init(); curl_setopt_array($curl, array( CURLOPT_URL => "http://ipwho.is/".$ip, CURLOPT_RETURNTRANSFER => benar, CURLOPT_ENCODING => "utf8", CURLOPT_MAXREDIRS => 10, CURLOPT_TIMEOUT => 30, CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1, CURLOPT_CUSTOMREQUEST => "DAPATKAN", CURLOPT_HTTPHEADER => tatasusunan( "terima: aplikasi/json", "jenis kandungan: application/json" ), )); $respon = curl_exec($curl); $err = curl_error($curl); //print_r($respon); curl_close($curl); jika ($err) { kembalikan "cURL Error #:" . $err; } lain { pulangkan $respon; } } function isIndo($ip) { $ip = getIP($ip); $info = json_decode($ip, benar); //print_r($maklumat); if( $info['country_code'] == "ID" ) { kembali benar; } lain { kembali palsu; } }</pre> <p>哪里出錯(cuò)了？</p>

if( isset($info['country_code']) && $info['country_code'] == "ID" ) {
    return true;
}