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我是 pchart 的新手，我在从 mysql 表创建图表时遇到了问题（可能是我错过了）。我想要的只是根据我将选择的项目绘制一行。它只工作了一次，然后每次我尝试再次运行脚本时，apache（我正在使用 apache2）给出超时并使用“top”检查服务器，进程 apache 使用 100% cpu 使用率。有时创建图表有时只是保持使用 100% 的 cpu 使用率并且什么都不做。如果我使用“autoOutput”方法在最后创建 .png 图像，则会出现错误，表示图像无法显示，因为它包含错误，但使用“Render”会创建图表，但有时正如我所解释的那样。以下是我的代码，希望有人能指点一下。

<?php
    /* pChart library inclusions */
     include("../../Library/class/pData.class.php");
     include("../../Library/class/pDraw.class.php");
     include("../../Library/class/pImage.class.php");
     include "../../connection.php";
    // Values from List.php
    $Selected=$_POST['Selection'];
    $MyData = new pData();  
    /* QUERY FOR THE CHART */
    $Requete = "SELECT * FROM table WHERE Sector = '$Selected' LIMIT 0 , 30";
    $Result  = mysql_query($Requete,$db)or die(mysql_error());
    while($row = mysql_fetch_array($Result))
     {
      $Sector = $row["Sector"];
      $Current_reading = $row["Current_reading"];
      $Old_Reading = $row['Old_reading'];
      $Month_Consumption = $row['Month_Consumption'];
      $Current_reading = $row['Current_reading'];
      $DM = $row['DM'];
      $FP = $row['FP'];
      $Cost = $row['Cost_KWh_$90.0000'];  


      $MyData->addPoints($Current_reading,'Current_reading');
      $MyData->addPoints($Old_Reading,'Old_reading');
      $MyData->addPoints($Month_Consumption,'Month_Consumption');
      $MyData->addPoints($DM,'DM');
      $MyData->addPoints($FP,'FP');
      $MyData->addPoints($Cost,'Cost_KWh_$90.0000');

     }
       /* Save the data in the pData array */
      $MyData->setAbscissa("Consumos_de");
      $MyData->setAbscissaName('February 2014');
      $MyData->setSerieDescription($Sector,"Sectores");
      $MyData->setAxisName(0,"Kw");  

     /* Create the pChart object */
     $myPicture = new pImage(800,230,$MyData);
     $myPicture->drawGradientArea(0,0,800,230,DIRECTION_VERTICAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>100));
     $myPicture->drawGradientArea(0,0,800,230,DIRECTION_HORIZONTAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>20));
     $myPicture->setFontProperties(array("FontName"=>"../../Library/fonts/verdana.ttf","FontSize"=>8));

     /* Draw the scale  */
     $myPicture->setGraphArea(50,30,780,200);
     $myPicture->drawScale(array("CycleBackground"=>TRUE,"DrawSubTicks"=>TRUE,"GridR"=>0,"GridG"=>0,"GridB"=>0,"GridAlpha"=>10));

     /* Turn on shadow computing */ 
     $myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>10));

     /* Draw the chart */
     $settings = array("Gradient"=>TRUE,"DisplayPos"=>LABEL_POS_INSIDE,"DisplayValues"=>TRUE,"DisplayR"=>255,"DisplayG"=>255,"DisplayB"=>255,"DisplayShadow"=>TRUE,"Surrounding"=>10);
     $myPicture->drawBarChart($settings);

     /* Write the chart legend */
     $myPicture->drawLegend(680,12,array("Style"=>LEGEND_BORDER,"Mode"=>LEGEND_VERTICAL));

     /* Render the picture (choose the best way) */
     $myPicture->Render("/var/www/images/YourGraph.png");
?>
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1 回答 1

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好吧，这样做是有效的：

我移出了 while 循环以下所有内容：

$MyData->addPoints($Current_reading,'Current_reading');
$MyData->addPoints($Old_Reading,'Old_reading');
$MyData->addPoints($Month_Consumption,'Month_Consumption');
$MyData->addPoints($DM,'DM');
$MyData->addPoints($FP,'FP');
$MyData->addPoints($Cost,'Cost_KWh_$90.0000');

最后我改变了

$myPicture->Render("/var/www/images/YourGraph.png");

并添加了这个：

$myPicture->autoOutput("YourChart.png");

我不得不对我试图绘制图表的信息进行更多排序，但是导致 100% CPU 使用率的问题得到解决，图表出现了。这真的是我的第一步，PHP我很抱歉这里的所有混乱。希望这对某人有帮助。

于 2014-09-29T05:04:22.153 回答