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  • DOMAttr::isId()

    (PHP 5, PHP 7)

    Checks if attribute is a defined ID

    说明

    publicDOMAttr::isId(void): 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 orDOMDocument::validateOnParsebefore using this function.

    返回值

    成功时返回TRUE,或者在失败时返回FALSE

    范例

    Example #1 DOMAttr::isId()Example

    <?php
    $doc = new DomDocument;
    // We need to validate our document before refering 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)
    ?>