Question

我有以下脚本，基本上应该从我的MySQL表中获取包含经度和纬度的字段，并计算行驶距离，然后以列表的形式回显给用户。

由于某种原因，脚本只打印出第一个结果，然后抛出错误Fatal Error: Cannot redeclare GetDrivingDistance()

mysqli_close($conn);            
$servername = "localhost";
$username = "user";
$password = "pwd";
$dbname = "buses";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
     die("Connection failed: " . $conn->connect_error);
} 
$sql = "SELECT * 
                    FROM matatus 
                    JOIN registered_matatus
                    ON matatus.user_id=registered_matatus.user_id 
                    ORDER BY matatus.vehicle_id 
                    ASC LIMIT 4";
if ($result->num_rows > 0) {
     // output data of each row
     echo "CON Select a matatu\n";
     while($row = $result->fetch_assoc()) {
//Start of  calculate distance and time
$lat1 = "-1.283180";
$long1 = "36.822462";
$lat2 = $row["lat"];
$long2 = $row["lng"];

function GetDrivingDistance($lat1, $lat2, $long1, $long2)
{
    $url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".$lat1.",".$long1."&destinations=".$lat2.",".$long2."&mode=driving&language=pl-PL";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    $response = curl_exec($ch);
    curl_close($ch);
    $response_a = json_decode($response, true);
    $dist = $response_a['rows'][0]['elements'][0]['distance']['text'];
    $time = $response_a['rows'][0]['elements'][0]['duration']['text'];
    return array('distance' => $dist, 'time' => $time);
}
    $dist = GetDrivingDistance($lat1, $lat2, $long1, $long2);
    $distance = $dist['distance'];
    $time = $dist['time'];
//End of calculate distance and time
         echo "". $row["id"]. " ". $row["reg_number"]. " (" . $row["sacco"] . ") -$time\n";
     }
} else {
     echo "0 results";
}
$conn->close();

任何关于如何解决这个问题的人都会非常感激。

Answer 1

试试这个：
你不能在循环中声明函数

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
     die("Connection failed: " . $conn->connect_error);
} 
$sql = "SELECT * 
                    FROM matatus 
                    JOIN registered_matatus
                    ON matatus.user_id=registered_matatus.user_id 
                    ORDER BY matatus.vehicle_id 
                    ASC LIMIT 4";
if ($result->num_rows > 0) {
     // output data of each row
     echo "CON Select a matatu\n";

function GetDrivingDistance($lat1, $lat2, $long1, $long2)
{
    $url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".$lat1.",".$long1."&destinations=".$lat2.",".$long2."&mode=driving&language=pl-PL";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    $response = curl_exec($ch);
    curl_close($ch);
    $response_a = json_decode($response, true);
    $dist = $response_a['rows'][0]['elements'][0]['distance']['text'];
    $time = $response_a['rows'][0]['elements'][0]['duration']['text'];
    return array('distance' => $dist, 'time' => $time);
}
while($row = $result->fetch_assoc()) {
//Start of  calculate distance and time
$lat1 = "-1.283180";
$long1 = "36.822462";
$lat2 = $row["lat"];
$long2 = $row["lng"];
$dist = GetDrivingDistance($lat1, $lat2, $long1, $long2);
$distance = $dist['distance'];
$time = $dist['time'];
//End of calculate distance and time
         echo "". $row["id"]. " ". $row["reg_number"]. " (" . $row["sacco"] . ") -$time\n";
     }
} else {
     echo "0 results";
}
$conn->close();

Answer 2

你的GetDrivingDistance函数在循环中。你不能在php中一次又一次地声明具有相同名称的函数。它会引导你得到同样的错误。

试试这个

mysqli_close($conn);            
$servername = "localhost";
$username = "user";
$password = "pwd";
$dbname = "buses";

 // Create connection
 $conn = new mysqli($servername, $username, $password, $dbname);
 // Check connection
   if ($conn->connect_error) {
 die("Connection failed: " . $conn->connect_error);
   } 
  $sql = "SELECT * 
                FROM matatus 
                JOIN registered_matatus
                ON matatus.user_id=registered_matatus.user_id 
                ORDER BY matatus.vehicle_id 
                ASC LIMIT 4";
  if ($result->num_rows > 0) {
 // output data of each row
 echo "CON Select a matatu\n";
 while($row = $result->fetch_assoc()) {
 //Start of  calculate distance and time
 $lat1 = "-1.283180";
$long1 = "36.822462";
$lat2 = $row["lat"];
$long2 = $row["lng"];


$dist = GetDrivingDistance($lat1, $lat2, $long1, $long2);
$distance = $dist['distance'];
$time = $dist['time'];
//End of calculate distance and time
     echo "". $row["id"]. " ". $row["reg_number"]. " (" . $row["sacco"] . ")         -$time\n";
 }
} else {
  echo "0 results";
}


function GetDrivingDistance($lat1, $lat2, $long1, $long2)
{
$url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".$lat1.",".$long1."&destinations=".$lat2.",".$long2."&mode=driving&language=pl-PL";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
curl_close($ch);
$response_a = json_decode($response, true);
$dist = $response_a['rows'][0]['elements'][0]['distance']['text'];
$time = $response_a['rows'][0]['elements'][0]['duration']['text'];
return array('distance' => $dist, 'time' => $time);
 }
 $conn->close();

为什么我的脚本会继续重新声明php函数？

2 个答案: