php中的货币转换器：只有一侧转换有效

Question

我正在尝试在我的网页中实现货币转换。

这是工作流程

1.用户可以从下拉菜单中选择货币。

2.根据此页面列出的奖品相对于新选择的货币进行了更改。

代码

1.当用户从会话变量中设置的下拉菜单货币值中选择一个项目并使用ajax调用重新加载页面时。

<select id="curr-dropmenu">
    <option disabled="" selected="">Choose</option>
<option value="INR">INR</option>
<option value="USD">USD</option>
<option value="AED">AED</option>
<option value="FED">FED</option>
<option value="XBJ">XBJ</option>
</select>

ajax 调用

$('#curr-dropmenu').on('change',function(e){
       //ajax call for setting the currency in session
       $.ajax({
           url:'ajax_set.php',
           data:{currency:$(this).val()},
           method:"POST",
           success:function(data){

               location.reload();
           },
           error:function(data){

               alert("ERROR"+JSON.strinfy(data));
           }
       });
    });

在ajax_set.php 文件中

<?php
session_start();  
$_SESSION['old_currency']= (!empty($_SESSION['new_currency']))?$_SESSION['new_currency']:'INR';
$_SESSION['new_currency']=$_POST['currency'];

2.当页面重新加载时，从会话中获取以前和当前的货币并向google currency converter发出api请求以将金额转换为所选奖品。

    <?php
     //getting the currency values from session.
         session_start();
       //old currency
         $from=(!empty($_SESSION['old_currency']))?$_SESSION['old_currency']:'INR';
         echo 'From:&nbsp;'.$from.'<br>';
  //new currency  
  $to=(!empty($_SESSION['new_currency']))?$_SESSION['new_currency']:'INR';
         echo 'To:&nbsp;'.$to.'<br>';
    //amount to be converted.

    $prize=array('2000','600','7000','2500','100000');
    echo '<br><br>';
    for($i=0;$i<5;$i++){
        //call the currency convert function 
        if($from!=$to)
        {
            $response=currencyConvert($from,$to,$prize[$i]);
            $converted_amount=filter_var($response,FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION);
        }
        else
        {
            $converted_amount=$prize[$i];
        }
        echo '<span>'.$converted_amount.' '.$to.'</span><hr/>';
    }


//make the api request for convert currency.
function currencyConvert($from,$to,$amount){
  // echo '<br>convert'.$f.'to'.$t;
    $url = "http://www.google.com/finance/converter?a=$amount&from=$from&to=$to"; 

    $request = curl_init(); 
    $timeOut = 0;
    curl_setopt ($request, CURLOPT_URL, $url); 
    curl_setopt ($request, CURLOPT_RETURNTRANSFER, 1); 

    curl_setopt ($request, CURLOPT_USERAGENT,"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)"); 
    curl_setopt ($request, CURLOPT_CONNECTTIMEOUT, $timeOut); 
    $response = curl_exec($request);
    curl_close($request);
    $regex  = '#\<span class=bld\>(.+?)\<\/span\>#s';
    preg_match($regex, $response, $converted);
    if(!empty($converted))
    return  ($converted[0])?$converted[0]:0;

}

这只适用于一种方式 例如：如果我将 INR 转换为 USD，则转换是正确的，但是当我选择 USD to INR 时，它会得到错误的输出。

Answer 1

您需要更改 php 脚本以将转换后的奖品发送到谷歌转换器 尝试以下代码并检查

     //getting the currency values from session.
         session_start();
       //old currency
         $from=(!empty($_SESSION['old_currency']))?$_SESSION['old_currency']:'INR';
         echo 'From:&nbsp;'.$from.'<br>';
  //new currency  
  $to=(!empty($_SESSION['new_currency']))?$_SESSION['new_currency']:'INR';
         echo 'To:&nbsp;'.$to.'<br>';
    //amount to be converted.

    $prize=array('2000','600','7000','2500','100000');
 $prize_old =(!empty($_SESSION['old_prize']))?$_SESSION['old_prize']:$prize; 
$prize_new =(!empty($_SESSION['new_prize']))?$_SESSION['new_prize']:$prize;  
$prize_converted = array();
    echo '<br><br>';
    for($i=0;$i<5;$i++){
        //call the currency convert function 
        if($from!=$to)
        {
            $response=currencyConvert($from,$to, $prize_new[$i]);
            $converted_amount=filter_var($response,FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION);
            array_push($prize_converted,round($converted_amount));
        }
        else
        {
            $converted_amount=$prize[$i];
             array_push($prize_converted,$converted_amount);

        }
        echo '<span>'.$converted_amount.' '.$to.'</span><hr/>';
    }
$_SESSION['old_priz'] = $prize;  
$_SESSION['new_prize'] = $prize_converted;


//make the api request for convert currency.
function currencyConvert($from,$to,$amount){
  // echo '<br>convert'.$f.'to'.$t;
     $url = "http://www.google.com/finance/converter?a=$amount&from=$from&to=$to"; 

    $request = curl_init(); 
    $timeOut = 0;
    curl_setopt ($request, CURLOPT_URL, $url); 
    curl_setopt ($request, CURLOPT_RETURNTRANSFER, 1); 

    curl_setopt ($request, CURLOPT_USERAGENT,"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)"); 
    curl_setopt ($request, CURLOPT_CONNECTTIMEOUT, $timeOut); 
    $response = curl_exec($request);
    curl_close($request);
    $regex  = '#\<span class=bld\>(.+?)\<\/span\>#s';
    preg_match($regex, $response, $converted);
    if(!empty($converted))
    return  ($converted[0])?$converted[0]:0;

}

希望对你有帮助

Answer 2

您好，请问您是向谷歌服务发送相同的货币吗？

更改您的支票

if ($from == $to)

到

if (strtoupper($from) == strtoupper($to))