Dom\Element::getElementsByClassName

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Dom\Element::getElementsByClassName — Returns a collection of descendant elements that have the given classes

说明

public function Dom\Element::getElementsByClassName(string $classNames): Dom\HTMLCollection

Returns a Dom\HTMLCollection of the descendants of this element, in document order, whose class attribute contains all the classes given in classNames. The element itself is never part of the collection.

参数

classNames

One or more class names separated by ASCII whitespace. An element only matches if it has every one of these classes, in any order.

Class names are compared case-sensitively, unless the document is in quirks mode, in which case the comparison is ASCII case-insensitive.

返回值

Returns a Dom\HTMLCollection of the matching elements. The collection is empty if no element matches, or if classNames contains no class name, for example when it is an empty string or only whitespace.

错误／异常

Throws a ValueError if classNames contains a null byte.

示例

示例 #1 Dom\Element::getElementsByClassName() example

<?php

$dom = Dom\HTMLDocument::createFromString(
    '<!DOCTYPE html><body><div id="list">'
        . '<p class="item new">One</p>'
        . '<p class="item">Two</p>'
        . '<p class="Item">Three</p>'
        . '</div></body>',
    LIBXML_NOERROR
);

$list = $dom->getElementById('list');

foreach ($list->getElementsByClassName('new  item') as $element) {
    echo $element->textContent, "\n";
}

echo $list->getElementsByClassName('item')->length, "\n";

以上示例会输出：

One
2

参见

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