略微加速

PHP官方手册 - 互联网笔记

PHP - Manual: DOMAttr::isId

2024-11-12

DOMAttr::isId

(PHP 5, PHP 7, PHP 8)

DOMAttr::isId Checks if attribute is a defined ID

说明

public DOMAttr::isId(): bool

This function checks if the attribute is a defined ID.

According to the DOM standard this requires a DTD which defines the attribute ID to be of type ID. You need to validate your document with DOMDocument::validate or DOMDocument::validateOnParse before using this function.

参数

此函数没有参数。

返回值

成功时返回 true, 或者在失败时返回 false

范例

示例 #1 DOMAttr::isId() Example

<?php

$doc 
= new DomDocument;

// We need to validate our document before referring to the id
$doc->validateOnParse true;
$doc->Load('book.xml');

// We retrieve the attribute named id of the chapter element
$attr $doc->getElementsByTagName('chapter')->item(0)->getAttributeNode('id');

var_dump($attr->isId()); // bool(true)

?>
add a noteadd a note

User Contributed Notes

There are no user contributed notes for this page.

官方地址:https://www.php.net/manual/en/domattr.isid.php

北京半月雨文化科技有限公司.版权所有 京ICP备12026184号-3