DOMDocument::validate()函數是PHP中的一個內置函數,用於根據其DTD(文檔類型定義)來驗證文檔。 DTD定義XML文件要遵循的規則或結構,如果XML文檔未遵循此格式,則此函數將返回false。
用法:
bool DOMDocument::validate( void )
參數:此函數不接受任何參數。
返回值:如果文檔遵循DTD或FALSE,則此函數返回TRUE。
以下示例說明了PHP中的DOMDocument::validate()函數:
範例1:
<?php
// Create a new DOMDocument
$doc = new DOMDocument;
// Load the XML with DTD rule to have
// a root element with first, second,
// and third as its three children
$doc->loadXML("<?xml version=\"1.0\"?>
<!DOCTYPE root [
<!ELEMENT root (first, second, third)>
<!ELEMENT first (#PCDATA)>
<!ELEMENT second (#PCDATA)>
<!ELEMENT third (#PCDATA)>
]>
<!-- Create a XML following the DTD -->
<root>
<first>Hello</first>
<second>There</second>
<third>World</third>
</root>");
// Check if XML follows the DTD rule
if ($doc->validate()) {
echo "This document is valid!\n";
}
?>
輸出:
This document is valid!
範例2:
<?php
// Create a new DOMDocument
$doc = new DOMDocument;
// Load the XML
$doc->loadXML("<?xml version=\"1.0\"?>
<!DOCTYPE root [
<!ELEMENT root (one, two, three)>
<!ELEMENT one (#PCDATA)>
<!ELEMENT two (#PCDATA)>
<!ELEMENT three (#PCDATA)>
]>
<!-- Create a XML voilating the DTD -->
<root>
<one>Hello</one>
<two>World</two>
</root>");
if (!$doc->validate()) {
echo "This document is not valid!";
}
?>
輸出:
This document is not valid!
參考: https://www.php.net/manual/en/domdocument.validate.php
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注:本文由純淨天空篩選整理自gurrrung大神的英文原創作品 PHP | DOMDocument validate() Function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。