php给出一个空白页面,没有错误

我有一个 AJAX应用程序的以下部分,它没有错误,但屏幕上也没有显示任何内容,所以我不确定问题所在.直接从具有？cmd& id = 1的浏览器调用此页面应该返回,或者甚至在没有？cmd的情况下调用它应该返回cmd错误消息.

编辑：添加测试用例：我确实得到了cmd错误消息,但是当我传递& id = 1(1是一个有效的id)时,没有返回任何html,查看源是完全空白的.我是否错误地使用了回声或类似的东西？

edit2：将echo添加为第一行：无法看到第一个echo

edit3：在回到旧版本并再次进行所有更改之后,我现在在使用有效的cmd和id参数调用时获得测试字符集输出.我使用的代码与下面粘贴的代码相同.

<?PHP
echo "hello world";    
error_reporting(E_ALL);

if (isset($_GET["cmd"]))
  $cmd = $_GET["cmd"];
else
  die("You should have a 'cmd' parameter in your URL");

$id = $_GET["id"];

$con = MysqLi_connect("localhost","user","password","db");
echo "test con";

if(!$con)
{
  die('Connection Failed because of' .MysqLi_connect_error());
  echo "test error";
}

//$con->query("SET NAMES 'utf8'"); 
$con->set_charset("utf8"));
echo "test charset";

if($cmd=="GetSALEData")
{
  echo "test cmdifloop";

  if ($getRecords = $con->prepare("SELECT * FROM SALES WHERE PRODUCT_NO = ?"))
  {
    echo "test recordifloop";

    $getHtml = $con->prepare("SELECT PRODUCT_DESC FROM SALES WHERE PRODUCT_NO = ?");
    $getHtml->bind_param("s",$id);
    $getHtml->execute();
    $getHtml->bind_result($PRODUCT_DESC);

    $getRecords->bind_param("s",$id);
    $getRecords->execute(); 
    $getRecords->bind_result($PRODUCT_NO,$PRODUCT_NAME,$SUBTITLE,$CURRENT_PRICE,$start_PRICE,$PRICE_COUNT,$QUANT_TOTAL,$QUANT_SOLD,$ACCESsstARTS,$ACCESSENDS,$ACCESSORIGIN_END,$USERNAME,$BEST_PRICEDER_ID,$FINISHED,$WATCH,$BUYITNow_PRICE,$PIC_URL,$PRIVATE_SALE,$SALE_TYPE,$ACCESSINSERT_DATE,$ACCESSUPDATE_DATE,$CAT_DESC,$CAT_PATH,$COUNTRYCODE,$LOCATION,$CONDITIONS,$REVISED,$PAYPAL_ACCEPT,$PRE_TERMINATED,$SHIPPING_TO,$FEE_INSERTION,$FEE_FINAL,$FEE_LISTING,$PIC_XXL,$PIC_DIASHOW,$PIC_COUNT,$ITEM_SITE_ID
                            ); 
    while ($getRecords->fetch()) 
    {
      $ccodes = array(  "1" => "USA","77" => "Germany","16" => "Austria","122" => "Luxemburg","193" => "Switzerland",);

      $conditions = array( "0" => "USA",);

      $country = $ccodes[$COUNTRYCODE];
      if ( $country == "" ) $country = "Not applicable";

      $columns = array('FINISHED','WATCH','PRIVATE_SALE','REVISED','PAYPAL_ACCEPT','PRE_TERMINATED','PIC_XXL','PIC_DIASHOW');

      foreach($columns as $column) {
        $$column = $row[$column] ? 'YES' : 'NO';
      }

      imageResize($PIC_URL,250,300);
      file_put_contents($id,file_get_contents($PIC_URL));

      $html = htmlentities(json_encode($PRODUCT_DESC));
      $shortDate = strftime("%d %m %Y",strtotime($ACCESsstARTS));

      echo "<h1>".$PRODUCT_NAME."</h1>
<div id='leftlayer' class='leftlayer'>
<p><strong>Username: </strong>".$USERNAME."
<p><strong>PRODUCT Number: </strong>".$PRODUCT_NO."
<p><strong>Subtitle: </strong>".$SUBTITLE."
<p><strong>SALE Start: </strong>".$ACCESsstARTS." 
<p><strong>SALE End: </strong>".$ACCESSENDS."
<p><strong>SALE Type: </strong>".$SALE_TYPE."
<p><strong>Category: </strong>".$CAT_DESC."
</div>
<div class='leftlayer2'>
  <p><strong>Condition: </strong> ".$CURRENT_PRICE."
  <p><strong>Total Items: </strong> ".$QUANT_TOTAL."
  <p><strong>Total Sales: </strong> ".$QUANT_SOLD."
  <p><strong>Start Price: &#8364</strong> ".$start_PRICE."
  <p><strong>BuyitNow Price: &#8364</strong> ".$BUYITNow_PRICE."
  <p><strong>PRICEs: </strong> ".$PRICE_COUNT." 
  <p><strong>Revised: </strong> ".$REVISED."
</div>
<div class='leftlayer2'>
  <p><strong>Private: </strong> ".$PRIVATE_SALE."
  <p><strong>Finished: </strong> ".$FINISHED."
  <p><strong>Cancelled: </strong> ".$PRE_TERMINATED."
  <p><strong>Paypal: </strong> ".$PAYPAL_ACCEPT."
  <p><strong>Country: </strong> ". $country ."
  <p><strong>Location: </strong> ".$LOCATION."
  <p><strong>Shipping to: </strong> ". $country ."
</div>
<div id='rightlayer'>
 <img src='".$PIC_URL."' width='".$imageSize["width"]."' height='".$imageSize["height"]."'>
 <p><a href='#' onclick=\"makewindows(" . $html . "); return false;\">Click for full description </a></p>
</div>
</div>
</div>";

    } 
  }

  function imageResize($imageURL,$maxWidth,$maxHeight)
  {
    $imageSize["width"] = 0;
    $imageSize["height"] = 0;

    $size = getimagesize($imageURL);
    if ($size) {
      $imageWidth  = $size[0];

      $imageHeight = $size[1];
      $wRatio = $imageWidth / $maxWidth;
      $hRatio = $imageHeight / $maxHeight;
      $maxRatio = max($wRatio,$hRatio);

      if ($maxRatio > 1) {
        $imageSize["width"] = $imageWidth / $maxRatio;
        $imageSize["height"] = $imageHeight / $maxRatio;
        return $imageSize;
      } else {
        $imageSize["width"] = $imageWidth;
        $imageSize["height"] = $imageHeight;
        return $imageSize;
      }
    } else {
      die(print_r(error_get_last()));
    }
  }

}

我为间距道歉,但是当我按下代码按钮时会自动发生.

第22行你有一个额外的括号

这个

$con->set_charset("utf8"));

需要这样

$con->set_charset("utf8");

两个未来的调试技巧.首先,您需要对Web主机进行shell访问,或者您需要在开发计算机上本地安装PHP.如果您正在运行Unix,那么您可能已经拥有它.打开终端并输入

PHP -v

如果你有,你可以通过做检查PHP 文件的语法

//on *nix
PHP yourfile.PHP

//or on windows
c:\path\to\PHP.exe yourfile.PHP

这将保留严重的语法错误.此外,谷歌/搜索此网站的“安装PHP本地教程”或类似的东西,以了解如何获得在您自己的机器上运行的Web服务器,MysqL 数据库和PHP的完整副本.

第二个建议,如果您安装本地副本将更容易,是检查您的错误日志.即使PHP没有显示错误消息,错误仍会记录到某个地方的文件中.在您的情况下,您已经在日志文件中看到过类似的内容

PHP Parse error:  Syntax error,unexpected ')' in foo.PHP on line 22

php给出一个空白页面,没有错误

相关推荐