PHP 过滤器过滤解析 RSS/XML

Question

我正在努力获取经过解析的 RSS 提要来过滤描述中的一些值。它是交通信息的提要，我想过滤提要以仅显示部分道路而不是全部。所以我需要过滤提要以仅显示具有 roadnr“A2”或“A4”或“N15”等的项目。

到目前为止，这是我的代码（不要介意 table 部分 :-)）

这个新手有什么想法可以遵循吗？提前致谢！

如果没有项目（空列表），“无结果”消息的奖励积分...

<?php
           $ch = curl_init("https://www.verkeerplaza.nl/rssfeed");
           curl_setopt($ch, CURLOPT_HEADER, 1);  
           curl_setopt($ch,CURLOPT_TIMEOUT, 30);  
           curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
           curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0);  
           curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);  

           $result=curl_exec ($ch);
           $data = strstr($result, '<?');  
           $xml = new SimpleXMLElement($data);  

 curl_close($curl);


$xml = simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA);
//die('<pre>' . print_r($xml], TRUE) . '</pre>');



$lastUpdate = $xml->channel->pubDate;

echo $lastUpdate;
echo "<table>";
echo "<tbody>";


for($i = 0; $i <5 ; $i++){
    
    $pubDate = $xml->channel->item[$i]->pubDate;
    $title = $xml->channel->item[$i]->title;
    $description = $xml->channel->item[$i]->description;
    $enclosure = $xml->channel->item[$i]->enclosure['url'];

    echo "<tr>";
      echo "<td>
            <img src='$enclosure' width='50'>
            </td>
            <td>
            &nbsp;&nbsp;
            </td>";
      echo "<td>
        <b>$title</b><br/>
        <small>$pubDate</small><br/>
        $description<br/><br/>
            </td>";
    echo "</tr>";
}
  echo "</tbody>";
echo "</table>";
?>

Answer 1

您需要做的最重要的更改是添加一种方法来根据您的道路列表过滤项目，并更改项目的循环，以便它不使用固定的迭代次数。

从那里，我们可以进行一些小的改进，使代码更易读和更易于管理。这是我认为的最小可行解决方案。您可能会花费大量时间使模板和道路匹配更加复杂，但假设道路名称始终以您的可识别字符串（A2、A4、N15）开头，这就完成了工作等）

<?php
// Test data
$data = <<<END
<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <title>Verkeerplaza.nl RSS feed</title>
        <link>https://www.verkeerplaza.nl</link>
        <description>Alle actuele files en verkeersinformatie van Verkeerplaza.nl</description>
        <atom:link href="https://www.verkeerplaza.nl/rssfeed" rel="self" type="application/rss+xml"/>
        <pubDate>2021-06-16T19:13:21+00:00</pubDate>
        <copyright>Copyright (c) 2019 -2021, Moop Mobility B.V.</copyright>
        <atom:logo>https://www.verkeerplaza.nl/favicon.png</atom:logo>
        <logo>https://www.verkeerplaza.nl/favicon.png</logo>
        <item>
            <title>A67 Eindhoven &gt; Venlo Tussen Afrit Asten en Brug Brug over de Zuid-Willemsvaart</title>
            <link>https://verkeerplaza.nl/files/A67</link>
            <pubDate>2021-06-16T21:12:00+02:00</pubDate>
            <description>Ongeluk tussen Afrit Asten en Brug Brug over de Zuid-Willemsvaart</description>
            <enclosure length="0" type="image/jpeg" url="https://verkeerplaza.nl/images/map-icons/red/01@3x.png"/>
        </item>
        <item>
            <title>A2 Amsterdam &gt; Utrecht Tussen Afrit Ouderkerk aan de Amstel en Afrit Amsterdam-Zuidoost</title>
            <link>https://verkeerplaza.nl/files/A2</link>
            <pubDate>2021-06-16T21:43:42+02:00</pubDate>
            <description>Ongeluk tussen Afrit Ouderkerk aan de Amstel en Afrit Amsterdam-Zuidoost</description>
            <enclosure length="0" type="image/jpeg" url="https://verkeerplaza.nl/images/map-icons/red/01@3x.png"/>
        </item>
        <item>
            <title>A3 Eindhoven &gt; Foo</title>
            <link>https://verkeerplaza.nl/files/A67</link>
            <pubDate>2021-06-16T21:12:10+02:00</pubDate>
            <description>Brug over de Zuid-Willemsvaart</description>
            <enclosure length="0" type="image/jpeg" url="https://verkeerplaza.nl/images/map-icons/red/01@3x.png"/>
        </item>
    </channel>
</rss>
END;

// Load XML into SimpleXMLElement
$xml = simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA);

/*
 * Define a template for our row markup, insert token strings for the values
 */
$rowTemplate = <<<END
<tr>
    <td><img src="%IMG%" width="50"></td>
    <td>&nbsp;&nbsp;</td>
    <td>
        <b>%ROAD%</b><br/>
        <small>%DATE%</small><br/>
        %DESC%
        <br/><br/>
    </td>
</tr>
END;

// Create an array of the tokens used int ht template
$tokens = ['%IMG%', '%ROAD%', '%DATE%', '%DESC%'];

// Create an array of valid road names
$targetRoads = ['A67', 'A2'];

// String buffer for the row markup
$rowMarkup = '';
foreach($xml->channel->item as $currItem)
{
    /*
     * Create an array of the values form the item that should be used
     * to replace tokens in the row template. This approach requires
     * the order of the values in this array to match the order of tokens
     * in the $tokens array. We can think about enhancing the later, but
     * it works for now.
     */
    $values = [
        $currItem->enclosure['url'],
        $currItem->title,
        $currItem->pubDate,
        $currItem->description
    ];

    // Create a flag to indicate whether or not the current item should be output as a row
    $valid = false;

    // Loop through the target road values
    foreach($targetRoads as $currRoad)
    {
        /*
         * The target road values are strings that should appear at the beginning
         * of the item title. The format of the feed is expected to consistently
         * include these strings at the beginning of each title.
         *
         * Look for the string at the beginning of the title, followed by a
         * whitespace character. This way, target "A2" returns "A2 Amsterdam"
         * but not "A25 Amsterdam"
         */
        preg_match("/^$currRoad\s/", $currItem->title, $matches);

        // If $matches is not empty, we have a good hit
        if(!empty($matches))
        {
            // Set the valid flag and break out of the search loop.
            $valid = true;
            break;
        }
    }

    // If the current item contains a road we are interested in, output a row
    if($valid)
    {
        // Use simple string replacement to generate markup from the row template
        $rowMarkup .= str_replace($tokens, $values, $rowTemplate);
    }
}

// Row to display in the table if no results are found.
$noResultsRow = <<<END
<tr>
    <td>No results</td>
</tr>
END;

// If we have no results, assign the value of $noResultsRow the $rowMarkup var
$rowMarkup = (empty($rowMarkup)) ? $noResultsRow:$rowMarkup;

// Format the pub date of the feed into something pretty
$lastUpdate = $xml->channel->pubDate;
$formattedDate = date('F j, Y g:i A', strtotime($lastUpdate));

// Create the final markup
$output = <<<END
<p>Last update: $formattedDate</p>
<table>
    <tbody>
        $rowMarkup
    </tbody>
</table>
END;

echo $output.PHP_EOL;

PHP 过滤器过滤解析 RSS/XML

PHP Filter to filter parsed RSS/XML

php

filter

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rss