我目前正在我的项目中使用Fusioncharts Free,它要求XML采用特定的格式,既可以显示数据,也可以显示图表的外观。
我有一个名为webservice.php的PHP文件,其中有许多类似的重复:
$address = $_SERVER['PHP_SELF'];
...
if ($address == 'webService.php/fcf/last5pricechanges/'){
//query MySQL DB and build up XML string in $output variable to output to browser
//building up each line of XML more or less line by line
}
输出的XML可能如下所示:
<graph caption="Active Items - Grouped by Site" showNames="1" decimalPrecision="0" bgcolor="eeeeee">
<set name="xyz.co.uk" value="1"/>
<set name="abc.com" value="5"/>
</graph>
更新此代码正在成为一个维护噩梦,但是由于Fusioncharts需要特定的XML属性,因此无法使用标准格式(例如REST)传输数据。是否有更好的方法来处理上述问题?我可以轻松地提高代码的模块性和可维护性吗?
答案 0 :(得分:2)
我有几个你可以考虑的想法。
<强>#1 强>
使用模板引擎(如Smarty)可能会使维护更容易一些。它至少会从PHP代码中删除XML。
例如,您可以为您发布的XML代码段创建一个模板:
<?xml version="1.0" encoding="UTF-8" ?>
{foreach from=$graphs item=graph}
<graph caption="{$graph.caption}" showNames="{$graph.show_names}" decimalPrecision="{$graph.decimal_precision}" bgcolor="{$graph.bg_color}">
{foreach from=$graph.set item=set}
<set name="{$set.name}" value="{$set.value}"/>
{/foreach}
</graph>
{/foreach}
从PHP中调用它
<?php
$address = $_SERVER['PHP_SELF'];
$smart = new Smarty();
$graphs = array();
if ($address == 'webService.php/fcf/last5pricechanges/')
{
$graph_result = mysql_query("SELECT caption, show_names, decimal_precision, bg_color
FROM graph WHERE something='something else'");
while($graph_row = mysql_fetch_assoc($graph_result))
{
$graph_row;
$set_result = mysql_query("SELECT name, value FROM set WHERE graph_id = {$graph_row['id']}");
while($set_row = mysql_fetch_assoc($set_result))
{
$graph_row['sets'][] = $set_row;
}
$graphs[] = $graph_row;
}
}
$smarty->assign('graphs', $graphs);
$smarty->display('graph_template.tpl');
?>
<强>#2 强>
您可以创建对象来帮助您管理代码。例如,要生成与以前相同的XML输出,您可以执行以下操作:
<?php
class Graph
{
protected $caption;
protected $show_names;
protected $decimal_precision;
protected $bg_color;
protected $sets;
public function __construct($graph_id)
{
$graph_result = mysql_query("SELECT caption, show_names, decimal_precision_bg_color
FROM graph WHERE something='something else'");
while($graph_row = mysql_fetch_assoc($graph_result))
{
list($this->caption, $this->show_names, $this->decimal_precision, $this->bg_color) = $graph_result;
$set_result = mysql_query("SELECT name, value FROM set WHERE graph_id = {$graph_row['id']}");
while($set_row = mysql_fetch_assoc($set_result))
{
$this->sets[] = $set_row;
}
}
}
public function fetch_xml()
{
$output = '<?' . 'xml version="1.0" encoding="UTF-8" ?' . '>';
$output .= "<graph caption=\"{$this->caption}\" showNames=\"{$this->show_names}\" decimalPrecision=\"{$this->decimal_precision}\" bgcolor=\"{$this->bg_color}\">\n";
foreach($this->sets as $set)
{
$output .= "<set name=\"{$set->name}\" value=\"{$set->value}\"/>\n";
}
$output .= "</graph>";
return $output;
}
}
?>
并在主代码中调用它,如:
<?php
$address = $_SERVER['PHP_SELF'];
if ($address == 'webService.php/fcf/last5pricechanges/')
{
$graph = new Graph(1);
echo $graph->fetch_xml();
}
?>
<强>#3 强>
您可以尝试使用类似SimpleXML的内容,但我怀疑这对可维护性有多大帮助,因为它与echo方法一样冗长
#4
......不,我全力以赴:-)
希望有所帮助。