PHP | DOMElement getElementsByTagName()函数
DOMElement::getElementsByTagName()函数是PHP中的一个内置函数，用于通过标记名获取元素。
句法：
DOMNodeList DOMElement::getElementsByTagName( string $name )参数：此函数接受单个参数$name保存标签名称或使用 * 获取所有标签。
返回值：此函数返回一个 DOMNodeList 值，该值包含具有给定标记名称的所有后代元素，按照在此元素树的前序遍历中遇到它们的顺序。
下面的例子说明了PHP中的DOMElement::getElementsByTagName()函数：
示例 1：
PHP
loadXML("
Hello, this is my red heading.
Hello, this is my green heading.
Hello, this is my blue heading.
");
// Save the XML
$nodeList = $dom->getElementsByTagName('h1');
foreach ($nodeList as $node) {
// Get the attribute value of style
echo $node->getAttribute('style') . '
';
}
?>PHP
loadXML("
Hello, this is my first paragraph.
Hello, this is my second paragraph.
Hello, this is my third paragraph.
");
// Get the element by tagname
$nodeList = $dom->getElementsByTagName('p');
foreach ($nodeList as $node) {
// Get the textContent
echo $node->textContent . '
';
}
?>输出：
color:red;
color:green;
color:blue;示例 2：
PHP
loadXML("
Hello, this is my first paragraph.
Hello, this is my second paragraph.
Hello, this is my third paragraph.
");
// Get the element by tagname
$nodeList = $dom->getElementsByTagName('p');
foreach ($nodeList as $node) {
// Get the textContent
echo $node->textContent . '
';
}
?>
输出：
Hello, this is my first paragraph.
Hello, this is my second paragraph.
Hello, this is my third paragraph.参考： https://www. PHP.net/manual/en/domelement.getelementsbytagname。 PHP