我正在嘗試使用 simplehtmldom 從https://benthamopen.com/browse-by-title/B/1/中提取信息。具體來說，我想訪問頁面的以下部分：<div style="padding:10px;"><strong>ISSN: </strong>1874-1207<br><div class="sharethis-inline-share-buttons" style="padding-top:10px;" data-url="https://benthamopen.com/TOBEJ/home/" data-title="The Open Biomedical Engineering Journal"></div></div>我有這個(gè)代碼：$html = file_get_html('https://benthamopen.com/browse-by-title/B/1/');foreach($html->find('div[style=padding:10px;]') as $ele) { echo("<pre>".print_r($ele,true)."</pre>");}...返回（我只顯示頁面中的一項(xiàng)）simplehtmldom\HtmlNode Object( [nodetype] => HDOM_TYPE_ELEMENT (1) [tag] => div [attributes] => Array ( [style] => padding:10px; ) [nodes] => Array ( [0] => simplehtmldom\HtmlNode Object ( [nodetype] => HDOM_TYPE_ELEMENT (1) [tag] => strong [attributes] => none [nodes] => none ) [1] => simplehtmldom\HtmlNode Object ( [nodetype] => HDOM_TYPE_TEXT (3) [tag] => text [attributes] => none [nodes] => none ) [2] => simplehtmldom\HtmlNode Object ( [nodetype] => HDOM_TYPE_ELEMENT (1) [tag] => br [attributes] => none [nodes] => none )我不確定如何從這里繼續(xù)。我想提取：ISSN 文本（在 echo 語句中沒有顯示 - 不確定為什么）[上例中的 1874-1207]。它是 [nodes] 的元素零'data-url' [https://benthamopen.com/TOBEJ/home/，在上面的示例中]“數(shù)據(jù)標(biāo)題”[開放生物醫(yī)學(xué)工程雜志，在上面的例子中]也許我對(duì)PHP對(duì)象和數(shù)組的理解還不夠好，我不知道為什么echo語句中沒有顯示ISSN。我嘗試了各種（很多）方法，但只是努力從元素中提取數(shù)據(jù)。
1 回答
森林海
TA貢獻(xiàn)2011條經(jīng)驗(yàn) 獲得超2個(gè)贊
我對(duì) simplehtmldom 不熟悉，除了知道避免它之外。因此，我將提出一個(gè)使用 PHP 內(nèi)置 DOM 類的解決方案：
<?php
libxml_use_internal_errors(true);
// get the HTML
$html = file_get_contents("https://benthamopen.com/browse-by-title/B/1/");
// create a DOM object and load it up
$dom = new DomDocument();
$dom->loadHtml($html);
// create an XPath object and query it
$xpath = new DomXPath($dom);
$elements = $xpath->query("//div[@style='padding:10px;']");
// loop through the matches
foreach ($elements as $el) {
// skip elements without ISSN
$text = trim($el->textContent);
if (strpos($text, "ISSN") !== 0) {
continue;
}
// get the first div inside this thing
$div = $el->getElementsByTagName("div")[0];
// dump it out
printf("%s %s %s<br/>\n", str_replace("ISSN: ", "", $text), $div->getAttribute("data-title"), $div->getAttribute("data-url"));
}
XPath 的內(nèi)容可能有點(diǎn)讓人不知所措，但對(duì)于像這樣的簡(jiǎn)單搜索，它與 CSS 選擇器沒有太大區(qū)別。希望評(píng)論能解釋一切，如果沒有，請(qǐng)告訴我！
輸出：
1874-1207 The Open Biomedical Engineering Journal https://benthamopen.com/TOBEJ/home/<br/>
1874-1967 The Open Biology Journal https://benthamopen.com/TOBIOJ/home/<br/>
1874-091X The Open Biochemistry Journal https://benthamopen.com/TOBIOCJ/home/<br/>
1875-0362 The Open Bioinformatics Journal https://benthamopen.com/TOBIOIJ/home/<br/>
1875-3183 The Open Biomarkers Journal https://benthamopen.com/TOBIOMJ/home/<br/>
2665-9956 The Open Biomaterials Science Journal https://benthamopen.com/TOBMSJ/home/<br/>
1874-0707 The Open Biotechnology Journal https://benthamopen.com/TOBIOTJ/home/<br/>
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