Question

我有一个从网页上抓取数据的功能。我选择了应该抓取数据的标签，我可以得到结果。 function.php是这样的：

<meta http-equiv="Content-Type" content="text/HTML; charset=utf-8" />

<?php

function LoadCURLPage($url, $agent = "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4 Gecko/20030624 Netscape/7.1 (ax)",
$cookie = '', $referer = '', $post_fields = '', $return_transfer = 1,
$follow_location = 1, $ssl = '', $curlopt_header = 0)
{
$ch = curl_init(); 

curl_setopt($ch, CURLOPT_URL, $url);

if($ssl)
{
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,  2);
}

curl_setopt ($ch, CURLOPT_HEADER, $curlopt_header);

if($agent)
{
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
}

if($post_fields)
{
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
}

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);


if($referer)
{
curl_setopt($ch, CURLOPT_REFERER, $referer);
}

if($cookie)
{
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie);
}

$result = curl_exec ($ch);

curl_close ($ch);

return $result;
}

function extract_unit($string, $start, $end)
{
$pos = stripos($string, $start);

$str = substr($string, $pos);

$str_two = substr($str, strlen($start));

$second_pos = stripos($str_two, $end);

$str_three = substr($str_two, 0, $second_pos);

$unit = trim($str_three); // remove whitespaces

return $unit;
}

?>

并且process.php就是这样：

<?php

error_reporting (E_ALL ^ E_NOTICE);

include 'function.php';

// Connect to this url using CURL

$url1 = 'http://www.remixon.com.tr/remixon.xml';


// Letâs use cURL to connect to the 

$data1 = LoadCURLPage($url1);


// Extract information between STRING 1 & STRING 2

$string_one1 = '<SatisFiyati>';
$string_two1 = '</SatisFiyati>';

$info1 = extract_unit($data1, $string_one1, $string_two1);

$info1 = duzenL($info1);

echo $info1;

?>

此process.php仅回显第一个标签中的已删除数据。但是我在该网址中有30个相同的标签，我需要将它们全部刮掉。

如何在所有相同的＆＃34; SatisFiyati＆＃34;之间检索数据？和＆＃34; / SatisFiyati＆＃34;一个网址中的标签？

Answer 1

使用DOMDocument从远程站点加载xml，而不是处理原始文本。然后，您可以提取与示例类似的所有elements by tagname：

<?php
include 'function.php';

// Connect to this url using CURL

$url1 = 'http://www.remixon.com.tr/remixon.xml';
$data1 = LoadCURLPage($url1);

$dom = new DOMDocument;
$dom->loadXML($data1);
$items = $dom->getElementsByTagName('SatisFiyati');
foreach ($items as $item) {
    // do something with the data here
    echo $item->nodeValue, PHP_EOL;
}

Answer 2

您可以使用preg_match_all()返回正则表达式的所有匹配项。

http://php.net/manual/en/function.preg-match-all.php

在您的情况下，您的函数extract_unit()将类似于：

function extract_unit($string, $start, $end)
{
    preg_match_all("/" . $start . "([^<]*)" . $end . "/", $string, $matches, PREG_PATTERN_ORDER);
    return $matches[1];
}

$matches[0]包含与完整模式匹配的字符串数组，$matches[1]包含由标记包围的字符串数组。所以你实际上需要$matches[1]。

如何在一系列相同的字符串之间刮？

2 个答案: