小妹请教各位前辈帮我把代码改成一个类！

我看书写了一段jpgraph折线图的代码！我想把它写成一个类，然后另外一个页面调用。但是总提示我错误！请各位前辈帮我指正和改写一下这个类！createGraphPic.php<?php
include ("../jpgraph/jpgraph.php");
include ("../jpgraph/jpgraph_line.php");         //引用折线图LinePlot类文件class GraphPolylines
{
var $graph;
var $p1; function GraphPolylines()
{
global $graph;
$graph = new Graph(600,300,"auto");         //创建画布
}
function setPicTiele($title) //设置标题
{
$graph->title->Set($title);
}
function setTickLabels($xTitle)//设置X轴显示内容
{
$graph->xaxis->SetTickLabels($a);          //设置X轴
}
function setLinePlot($data) //创建折线对象
{
global $p1;
$p1 = new LinePlot($data);          //创建折线图对象
$p1->->SetType(MARK_FILLEDCIRCLE);      //设置数据坐标点为圆形标记
$p1->->SetFillColor("red");         //设置填充的颜色
$p1->->SetWidth(4);           //设置圆形标记的直径为4像素
$p1->SetColor("blue");           //设置折线颜色为蓝色
}
function createPic()//真正画图
{ //设置统计图所在画布的位置，左边距50、右边距40、上边距30、下边距40，单位为像素
$graph->img->SetMargin(50,40,30,40);
$graph->img->SetAntiAliasing();
//设置折线的平滑状态
$graph->SetScale("textlin");
//设置刻度样式
$graph->SetShadow();           //创建画布阴影 $graph->title->SetFont(FF_SIMSUN,FS_BOLD);      //设置标题字体
$graph->SetMarginColor("lightblue");        //设置画布的背景颜色为淡蓝色
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);     //设置Y轴标题的字体
$graph->xaxis->SetPos("min");
$graph->yaxis->HideZeroLabel();
$graph->ygrid->SetFill(true,'#[email protected]','#[email protected]'); $graph->xaxis->SetFont(FF_SIMSUN);         //设置X坐标轴的字体
$graph->yscale->SetGrace(20);

$graph->Add($p1);            //在统计图上绘制折线
$graph->Stroke("consture.png");            //输出图像
}}
/*  原代码我就是仿这个程序写成类$datay = array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460);
//定义数组
$graph = new Graph(600,300,"auto");         //创建画布
//设置统计图所在画布的位置，左边距50、右边距40、上边距30、下边距40，单位为像素
$graph->img->SetMargin(50,40,30,40);
$graph->img->SetAntiAliasing();
//设置折线的平滑状态
$graph->SetScale("textlin");
//设置刻度样式
$graph->SetShadow();           //创建画布阴影
$graph->title->Set("2007年《PHP5从入门到精通》图书月销售额折线图"); //设置标题
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);      //设置标题字体
$graph->SetMarginColor("lightblue");        //设置画布的背景颜色为淡蓝色
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);     //设置Y轴标题的字体
$graph->xaxis->SetPos("min");
$graph->yaxis->HideZeroLabel();
$graph->ygrid->SetFill(true,'#[email protected]','#[email protected]');
$a=array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月");//X轴
$graph->xaxis->SetTickLabels($a);          //设置X轴
$graph->xaxis->SetFont(FF_SIMSUN);         //设置X坐标轴的字体
$graph->yscale->SetGrace(20);
$p1 = new LinePlot($datay);          //创建折线图对象
$p1->->SetType(MARK_FILLEDCIRCLE);      //设置数据坐标点为圆形标记
$p1->->SetFillColor("red");         //设置填充的颜色
$p1->->SetWidth(4);           //设置圆形标记的直径为4像素
$p1->SetColor("blue");           //设置折线颜色为蓝色
$p1->SetCenter();            //在X轴的各坐标点中心位置绘制折线
$graph->Add($p1);            //在统计图上绘制折线
$graph->Stroke("consture.png");            //输出图像*/
?>
另外一个页面调用
jpgraphzhe.php<?php
include ("createGraphPic.php");
$graphPic=new GraphPolylines();
$title="2007年《PHP5从入门到精通》图书月销售额折线图";
$graphPic->setPicTiele($title);
$a=array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月");//X轴
$graphPic->setTickLabels($a);
$datay = array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460);
$graphPic->setLinePlot($datay);
$graphPic->createPic();
?>
<html><head>
<title>jpgraph折线图</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link rel="stylesheet" href="../images/style.css" type="text/css">
</head>
<body bgcolor="#FFFFFF">
<br>
<br>
<table width="550" border="0" cellspacing="0" cellpadding="0">
<tr align="center">
<td><img src="consture.png" border=0 alt="<?=$title?>">
</td>
</tr>
</table>
</body>
</html>

解决方案 »

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你先了解php类是怎么写的.
特别是类内部如何访问实例化对象属性/方法,关键字$this
class a
{
  //constructor
  function a(){
    $this->graph = 1;
  }
  function getGraph()
  {
    return $this->graph;
  }
}$b = new a();
echo $b->getGraph();//1
class a {
   //constructor
   function a(){
       $this->graph = 1;
   }
   function getGraph() {
       return $this->graph;
   }
}
$b = new a();
echo $b->getGraph();//1
小妹，你技术已经不错了，改成PHP大多地方也是对的，只是有少部分是错误的，PHP的类方面的东西不多，你下一个教程看一下就可以搞定了！祝你成功！
二楼的前辈！您还是没解决我的问题！主要问题在这里    function GraphPolylines()
    {
        global $graph;
        $graph = new Graph(600,300,"auto");//这里我new了之后
    }
    function setPicTiele($title) //设置标题
    {
        $graph->title->Set($title);//这里调用的时候报错！
    }
Graph类是我引用的include ("../jpgraph/jpgraph.php");
这里面的一个类
    function GraphPolylines()
    {
        global $graph;
        $GLOBALS['graph'] = new Graph(600,300,"auto");//这里我new了之后
        $this->graph =$GLOBALS['graph'];//类里调用变量要使用$this
    }
    function setPicTiele($title) //设置标题
    {
        $this->graph->title->Set($title);//这里调用的时候报错！
    }
---------------------------------
40多K PHP实现 ORM 数据库类http://topic.csdn.net/u/20100226/12/43bf3dc5-795f-4fa5-861a-2f7bf8fd0cd6.html
class  GraphPolylines
{
  function GraphPolylines()
    {
        //global $graph;//你以为这里global $graph,类内各方法就能读到$graph?global不是这么用的.
        $this->graph = new Graph(600,300,"auto");//这里我new了之后
    }
    function setPicTiele($title) //设置标题
    {
        $this->graph->title->Set($title);//这里调用的时候报错！
    }
}
6楼的前辈我改了一下代码！还是报错！<?php
include ("../jpgraph/jpgraph.php");
include ("../jpgraph/jpgraph_line.php");         //引用折线图LinePlot类文件
class GraphPolylines
{
var $graph;
var $p1;
function GraphPolylines()
{
global $graph;
$GLOBALS['graph'] = new Graph(600,300,"auto");//创建画布
//$graph = new Graph(600,300,"auto");
$this->graph =$GLOBALS['graph'];//类里调用变量要使用$this
} function setPicTiele($title) //设置标题
{
$this->graph->title->Set($title); //这里不报错了！
}
function setTickLabels($xTitle)//设置X轴显示内容
{
$this->graph->xaxis->SetTickLabels($xTitle);//但是这里报错！
}
}
?>
错误描述：Fatal error: Call to a member function SetTickLabels() on a non-object in D:\wamp\www\admin\test\createGraphPic.php on line 26
还是报错啊！
<?php
include ("../jpgraph/jpgraph.php");
include ("../jpgraph/jpgraph_line.php");         //引用折线图LinePlot类文件
class GraphPolylines
{
var $graph;
var $p1;
function GraphPolylines()
{
//global $graph;
//$GLOBALS['graph'] = new Graph(600,300,"auto");//创建画布
$this->graph  = new Graph(600,300,"auto");
//$this->graph =$GLOBALS['graph'];//类里调用变量要使用$this
} function setPicTiele($title) //设置标题
{
$this->graph->title->Set($title);
}
function setTickLabels($xTitle)//设置X轴显示内容
{
$this->graph->xaxis->SetPos("min");
$this->graph->xaxis->SetFont(FF_SIMSUN);         //设置X坐标轴的字体
$this->graph->xaxis->SetTickLabels($xTitle);//设置X轴
}
}
?>错误描述：Fatal error: Call to a member function SetTickLabels() on a non-object in D:\wamp\www\admin\test\createGraphPic.php on line 26
悟性需要提高,改了$graph,你改了$p1没有?
<?php
include ("../jpgraph/jpgraph.php");
include ("../jpgraph/jpgraph_line.php");        //引用折线图LinePlot类文件class GraphPolylines
{
    var $graph;
    var $p1;
    function GraphPolylines()
    {
        $this->graph = new Graph(600,300,"auto");         //创建画布
    }
    function setPicTiele($title) //设置标题
    {
        $this->graph->title->Set($title);
    }
    function setTickLabels($xTitle)//设置X轴显示内容
    {
        $this->graph->xaxis->SetTickLabels($xTitle);          //设置X轴
    }
    function setLinePlot($data) //创建折线对象
    {
        $this->p1 = new LinePlot($data);          //创建折线图对象
        $this->p1->->SetType(MARK_FILLEDCIRCLE);      //设置数据坐标点为圆形标记
        $this->p1->->SetFillColor("red");         //设置填充的颜色
        $this->p1->->SetWidth(4);           //设置圆形标记的直径为4像素
        $this->p1->SetColor("blue");           //设置折线颜色为蓝色
    }
    function createPic()//真正画图
    {        //设置统计图所在画布的位置，左边距50、右边距40、上边距30、下边距40，单位为像素
        //$this->graph->img->SetMargin(50,40,30,40);
        $this->graph->img->SetAntiAliasing();
        //设置折线的平滑状态
        $this->graph->SetScale("textlin");
        //设置刻度样式
        $this->graph->SetShadow();           //创建画布阴影        $this->graph->title->SetFont(FF_SIMSUN,FS_BOLD);      //设置标题字体
        $this->graph->SetMarginColor("lightblue");        //设置画布的背景颜色为淡蓝色
        $this->graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);     //设置Y轴标题的字体
        $this->graph->xaxis->SetPos("min");
        $this->graph->yaxis->HideZeroLabel();
        $this->graph->ygrid->SetFill(true,'#[email protected]','#[email protected]');        $this->graph->xaxis->SetFont(FF_SIMSUN);         //设置X坐标轴的字体
        $this->graph->yscale->SetGrace(20);

        $this->graph->Add($this->p1);            //在统计图上绘制折线
        $this->graph->Stroke("consture.png");            //输出图像
    }
}
if(!file_exists('consture.png'))
{
$graph = new GraphPolylines();
$graph->setPicTiele('2007年《PHP5从入门到精通》图书月销售额折线图');
$graph->setLinePlot(array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460));
$graph->createPic();
}
else
echo "<img src='consture.png'/>";?>
以上代码本地测试通过.
如果还有问题,可能是jpgragh版本问题.
$graph = new GraphPolylines();
    $graph->setPicTiele('2007年《PHP5从入门到精通》图书月销售额折线图');
    $graph->setTickLabels(array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"));
    $graph->setLinePlot(array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460));
    $graph->createPic();
echo "<img src='consture.png'/>";
12楼前辈您把这句话加上您在帮我看看！
$graph->setTickLabels(array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"));
就差这一行了！就这一行报错！
把所有$graph换成 $this->graph
可能跟画图顺序相关,你再仔细排下画图代码的顺序.
或者你可以这么改
class GraphPolylines
{
    var $graph;
    var $p1;
    function GraphPolylines()
    {
        $this->graph = new Graph(600,300,"auto");         //创建画布
    }
    function setPicTiele($title) //设置标题
    {
        $this->graph->title->Set($title);
    }
    function setTickLabels($xTitle)//设置X轴显示内容
    {
$this->xTitle = $xTitle;

    }
    function setLinePlot($data) //创建折线对象
    {
        $this->p1 = new LinePlot($data);          //创建折线图对象
        $this->p1->->SetType(MARK_FILLEDCIRCLE);      //设置数据坐标点为圆形标记
        $this->p1->->SetFillColor("red");         //设置填充的颜色
        $this->p1->->SetWidth(4);           //设置圆形标记的直径为4像素
        $this->p1->SetColor("blue");           //设置折线颜色为蓝色
    }
    function createPic()//真正画图
    {        //设置统计图所在画布的位置，左边距50、右边距40、上边距30、下边距40，单位为像素
        //$this->graph->img->SetMargin(50,40,30,40);
        $this->graph->img->SetAntiAliasing();
        //设置折线的平滑状态
        $this->graph->SetScale("textlin");
        //设置刻度样式
        $this->graph->SetShadow();           //创建画布阴影        $this->graph->title->SetFont(FF_SIMSUN,FS_BOLD);      //设置标题字体
        $this->graph->SetMarginColor("lightblue");        //设置画布的背景颜色为淡蓝色
        $this->graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);     //设置Y轴标题的字体
        $this->graph->xaxis->SetPos("min");
        $this->graph->yaxis->HideZeroLabel();
        $this->graph->ygrid->SetFill(true,'#[email protected]','#[email protected]');        $this->graph->xaxis->SetFont(FF_SIMSUN);         //设置X坐标轴的字体
        $this->graph->yscale->SetGrace(20);
        if(!!$this->xTitle)
{
$this->graph->xaxis->SetTickLabels($this->xTitle);
}
        $this->graph->Add($this->p1);            //在统计图上绘制折线

        $this->graph->Stroke("consture.png");            //输出图像
    }
}
if(!file_exists('consture.png'))
{
$graph = new GraphPolylines();
$graph->setPicTiele('2007年《PHP5从入门到精通》图书月销售额折线图');
$graph->setLinePlot(array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460));
$graph->setTickLabels(array("a月","b月","c月","4月","5月","6月","7月","8月","9月","10月","11月","12月"));
$graph->createPic();
}
echo "<img src='consture.png'/>";
不对！$graph = new GraphPolylines();
    $graph->setPicTiele('2007年《PHP5从入门到精通》图书月销售额折线图');
    $graph->setTickLabels(array("1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"));//$graph是new出来的对象。setTickLabels是一个方法。
//它报错主要是指这个setTickLabels方法里
//$this->graph->xaxis->SetTickLabels($xTitle);  的这行报错！    $graph->setLinePlot(array(8320,9360,14956,17028,13060,15376,25428,16216,28548,18632,22724,28460));
    $graph->createPic();
echo "<img src='consture.png'/>";
龙腾虎跃非常感谢！已经成功了！让您费心了！太感谢了！在讨饶一下我是刚学PHP！
if(!!$this->xTitle)这里两个叹号在PHP里是什么意思！
判断数组是否为空的小技巧,也可以用count函数.
$a = array();
echo !$a ;//1,true
echo !!$a ;//0,false
$a = array(1);
echo !$a ;//0,false
echo !!$a ;//1,true