为什么我收到无法重新声明 httpGet() 错误

Question

下面是我出错的代码：

for ($i = 0, $count = count($arr1); $i < $count; $i++) 
{
   print $arr1[$i]."\n\r\n\r\n\r\n\r<br/><br/><br/>";
   $_SESSION['arrayvalue'] = "$arr1[$i]";
   $in = $arr1[$i];
   $in = str_replace(' ','+',$in); // space is a +
   //google site search start here
   function httpGet($url15)
   {
      $ch = curl_init();  
      curl_setopt($ch,CURLOPT_URL,$url15);
      curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
      //  curl_setopt($ch,CURLOPT_HEADER, false); 
      $output=curl_exec($ch);
      curl_close($ch);
      return $output;
   }

   $result15 = httpGet("https://www.google.com/cse?cx=003255331468891741234:xxxxxxxxx&client=google-csbe&output=xml_no_dtd&q='.$in.'&oq='.$in.'");
   echo $result15;
   //this is to get perticular tag/node value 
   $dom = new DomDocument;
   $dom->preserveWhiteSpace = FALSE;
   $dom->loadXML($result15);
   $N = $dom->getElementsByTagName('U');
   foreach ($N as $U) {
      echo $U->nodeValue, PHP_EOL."<br/>";
   }
}

这是我在显示一个结果后得到的错误：

Fatal error: Cannot redeclare httpGet() (previously declared in 
/home/checkforplag/public_html/test/index.php:352) in
/home/checkforplag/public_html/test/index.php on line 352

Answer 1

尝试将函数 httpGet() 移出 for 循环。

Answer 2

出现此问题是因为您试图多次定义函数 httpGet（它在循环内）。只需将其移除到外部，即可定义函数并允许稍后在脚本中使用它。另见 this answer。

//google site search start here
function httpGet($url15)
{
   $ch = curl_init();  
   curl_setopt($ch,CURLOPT_URL,$url15);
   curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
   //  curl_setopt($ch,CURLOPT_HEADER, false); 
   $output=curl_exec($ch);
   curl_close($ch);
   return $output;
}

for ($i = 0, $count = count($arr1); $i < $count; $i++) 
{
   print $arr1[$i]."\n\r\n\r\n\r\n\r<br/><br/><br/>";
   $_SESSION['arrayvalue'] = "$arr1[$i]";
   $in = $arr1[$i];
   $in = str_replace(' ','+',$in); // space is a +

   $result15 = httpGet("https://www.google.com/cse?cx=003255331468891741234:xxxxxxxxx&client=google-csbe&output=xml_no_dtd&q='.$in.'&oq='.$in.'");
   echo $result15;
   //this is to get perticular tag/node value 
   $dom = new DomDocument;
   $dom->preserveWhiteSpace = FALSE;
   $dom->loadXML($result15);
   $N = $dom->getElementsByTagName('U');
   foreach ($N as $U) {
      echo $U->nodeValue, PHP_EOL."<br/>";
   }
}

另一种方法是将您的函数包装在 if 语句中以查看该函数是否已经存在：

if ( !function_exists('httpGet') )
{
    function httpGet($url15)
    {
        //Function code here
    }
}

为什么我收到无法重新声明 httpGet() 错误

why i am getting Cannot redeclare httpGet() error

javascript

php

xml

jquery

gssapi