我想在 HTML 元素中獲取注釋，但顯然，注釋不在 DOM 元素的層次結(jié)構(gòu)中。例如，<!-- FIRST --><div id="parent"><!-- SECOND --> <span id="child"><!-- THIRD --> </span</div>使用的第二個參數(shù)時$xpath->query無效。$comments=$xpath->query('//comment()');foreach($comments as $comment){echo $comment->nodeValue.PHP_EOL;}// Query (intended) within <div id="parent">$el = $doc->getElementById('parent');$comments=$xpath->query('//comment()',$el);foreach($comments as $comment){echo $comment->nodeValue.PHP_EOL;}// Query (intended) within <div id="child">$el = $doc->getElementById('child');$comments=$xpath->query('//comment()',$el);foreach($comments as $comment){echo $comment->nodeValue.PHP_EOL;}并且所有三個循環(huán)的輸出都是相同的， FIRST SECOND THIRD FIRST SECOND THIRD FIRST SECOND THIRD
1 回答
largeQ
TA貢獻2039條經(jīng)驗 獲得超8個贊
必須相對于給定的上下文節(jié)點選擇評論。
xpath 表達式中的//(descendant-or-self) 前綴選擇節(jié)點中任何位置的每個注釋，無論上下文如何。
我建議使用.//(self, descendant-or-self) xpath 表達式進行相對搜索，以在提供的上下文中進行搜索。
例如，
<?php
$xml = <<< XML
<!-- FIRST -->
<div id="parent">
<!-- SECOND -->
<span id="child">
<!-- THIRD -->
</span>
</div>
XML;
$dom = new DOMDocument;
$dom->loadHTML($xml);
$xpath = new DOMXpath($dom);
文檔中的所有評論
<?php
$comments = $xpath->query('.//comment()', $dom);
foreach($comments as $comment){
echo $comment->nodeValue.PHP_EOL;
}
FIRST
SECOND
THIRD
評論區(qū)里的所有評論div#parent
<?php
$el = $dom->getElementById('parent');
$comments = $xpath->query('.//comment()', $el);
foreach($comments as $comment){
echo $comment->nodeValue.PHP_EOL;
}
SECOND
THIRD
中的所有評論span#child
<?php
$el = $dom->getElementById('child');
$comments = $xpath->query('.//comment()', $el);
foreach($comments as $comment){
echo $comment->nodeValue.PHP_EOL;
}
THIRD
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