带有includes的PHP XML输出 - PHP XML Output with includes?

我正在尝试输出线路中电话的当前时间和温度。它需要作为XML输出。到目前为止，我有

<?php
header("content-type: text/xml");
echo "<?xml version='1.0' encoding='UTF-8'?>";
echo "<Response>";
echo "<Say>";
echo('Time is');
echo date('H:i');
echo('Temp is');
echo "</Say>";
echo "</Response>";
?>

我遇到的问题是温度。我一直在尝试使用以下示例。但每次我尝试包含它时，我都会收到警告：无法修改标头信息-已经发送了标头

<?php
function getWeatherRSS($weatherLink){
   if ($fp = fopen($weatherLink, 'r')) {
      $content = '';
      while ($line = fread($fp, 1024)) {
         $content .= $line;
      }
   }
   return $content;  
}
function processWeather($wurl){
    $wrss = getWeatherRSS($wurl);
    $temp  = '-';
    $tempu = '';
    $city  = '';
    if (strlen($wrss)>100){
        // Get temperature unit C or F
        $spos = strpos($wrss,'yweather:units temperature="')+strlen('yweather:units temperature="');
        $epos = strpos($wrss,'"',$spos);
        if ($epos>$spos){
            $tempu = substr($wrss,$spos,$epos-$spos);
        } 
        $spos = strpos($wrss,'yweather:wind chill="')+strlen('yweather:wind chill="');
        $epos = strpos($wrss,'"',$spos);
        if ($epos>$spos){
            $temp += substr($wrss,$spos,$epos-$spos);
        } else {
            $temp = '-';
        }
        // Get city name
        $spos = strpos($wrss,'yweather:location city="')+strlen('yweather:location city="');
        $epos = strpos($wrss,'"',$spos);
        if ($epos>$spos){
            $city = substr($wrss,$spos,$epos-$spos);
        } 
    }
    return $city.' &nbsp;'.$temp.' &deg;'.$tempu;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd">
<html>
<head>
   <title>Micro Weather</title>
   <link href="style/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <div id="main">
      <div id="caption">CURRENT WEATHER</div>
      <div id="icon2">&nbsp;</div>
      <div id="result"><?php echo processWeather('http://xml.weather.yahoo.com/forecastrss?p=USAR0543&u=f'); ?>
      </div>
      <div id="source">Micro Weather 1.0</div>
    </div>
</body>

关于如何将温度传递到XML中，有什么建议吗？

输出文本后不能发送头端。将所有打印和回显实例放在最后一个标头调用之后。

如果需要表单数据，可以使用重定向。

我最终让它与以下一起工作

<?php
date_default_timezone_set('America/Chicago');

function getWeatherRSS($weatherLink){
   if ($fp = fopen($weatherLink, 'r')) {
      $content = '';
      while ($line = fread($fp, 1024)) {
         $content .= $line;
      }
   }
   return $content;  
}
function processWeather($wurl){
    $wrss = getWeatherRSS($wurl);
    $temp  = '-';
    $tempu = '';
    $city  = '';
    if (strlen($wrss)>100){
        // Get temperature unit C or F
        $spos = strpos($wrss,'yweather:units temperature="')+strlen('yweather:units temperature="');
        $epos = strpos($wrss,'"',$spos);
        if ($epos>$spos){
            $tempu = substr($wrss,$spos,$epos-$spos);
        } 
        $spos = strpos($wrss,'yweather:wind chill="')+strlen('yweather:wind chill="');
        $epos = strpos($wrss,'"',$spos);
        if ($epos>$spos){
            $temp += substr($wrss,$spos,$epos-$spos);
        } else {
            $temp = '-';
        }
        // Get city name
        $spos = strpos($wrss,'yweather:location city="')+strlen('yweather:location city="');
        $epos = strpos($wrss,'"',$spos);
        if ($epos>$spos){
            $city = substr($wrss,$spos,$epos-$spos);
        } 
    }
    return $temp;

}
   $a = processWeather('http://xml.weather.yahoo.com/forecastrss?p=USAR0543&u=f');
header("content-type: text/xml");
echo "<?xml version='1.0' encoding='UTF-8'?>";
echo "<Response>";
echo "<Say>";
echo('TXK Today Time is');
echo "</Say>";
echo "<Say>";
echo date('g:i ');
echo "</Say>";
echo "<Say>";
echo('Current Temperature');
echo "</Say>";
echo "<Say>";
echo $a;
echo "</Say>";
echo "</Response>";
?>