从PHP中的函数返回变量(返回无效) [英] Returning a variable from a function in php (return not working)

问题描述

我正在函数内部构建XML页面，由于某些奇怪的原因，我没有从函数中吐出全部内容.我已经尝试过

I'm building an XML page inside of a function, and for some strange reason I don't get the whole thing spit out of the function. I've tried

return $thisXml;
}
echo $thisXML;

，我只得到函数前变量中的xml声明. 如果我在函数中添加回显，则应按原样返回所有内容.

and I only get the xml declaration which is in the variable before the function. If i put an echo in the function, i get everything back as I should.

我的页面基本上是这样的

my page essentially looks like this

$thisXml = 'xml declaration stuff';

function getThisXML($thisXML){
  for(i=1; i<5; i++){
  $query "has the 5 in it";

  while ($mysqlQuery =mysql_fetch_array($theQuery) {
    $thisXml.='add the xml';
  }
  $thisXml.='close the last element';
  return $thisXml;
}

echo $thisXml;

正如我所说，如果我将'return'替换为'echo'，则会得到所有不错的xml.如果我在函数外回显，则只会得到原始的声明.

as i said, if I replace the 'return' with 'echo', I get all the nice xml. if I echo outside the function, I only get the original declaration.

真的很奇怪，我整天都在为此苦苦挣扎.

really strange, and i've been struggling with this one all day.

推荐答案

return $thisXml;
}
echo $thisXML;

$ thisXML;仅存在于功能范围内. 要么使$ thisXML;全局(不好的主意)或echo getThisXML()，其中getThisXML是返回$thisXML;

$thisXML; only exists in the scope of the function. Either make $thisXML; global (bad idea) or echo getThisXML() where getThisXML is the function that returns $thisXML;

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