XMLReader::next()函數是PHP中的內置函數,用於將光標移到下一個跳過所有子樹的節點。此函數的另一種用法是它接受直接移動到元素的節點名稱。
用法:
bool XMLReader::next( string $localname )
參數:該函數接受單個參數$localname,該參數保存要移動到的下一個節點的名稱。
返回值:如果成功,則此函數返回TRUE;如果失敗,則返回FALSE。
以下示例程序旨在說明PHP中的XMLReader::next()函數:
程序1:在此程序中,我們將遍曆XML樹。
文檔名稱: data.xml
<?xml version="1.0" encoding="utf-8"?>
<div1>
<h1> Foo Bar </h1>
<div2>
<h1> Foo Bar </h1>
</div2>
</div1>
文檔名稱: index.php
<?php
// Create a new XMLReader instance
$XMLReader = new XMLReader();
// Open the XML file
$XMLReader->open('data.xml');
// Iterate through the XML nodes
// to reach the h1 node
$XMLReader->read();
$XMLReader->read();
$XMLReader->next();
// Print name of element
echo "Before:<br> We are currently"
. " at:$XMLReader->name<br>";
// Move to next node which is
// text "Foo Bar"
$XMLReader->next();
// Move to next element
// which is div2
$XMLReader->next();
// Print name of element
echo "After:<br> We are currently"
. " at:$XMLReader->name";
?>
輸出:
之前:
We are currently at:h1
後:
We are currently at:div2
程序2:在此程序中,我們將移至XML樹中的特定節點。
文檔名稱:data.xml
<?xml version="1.0" encoding="utf-8"?>
<div1>
<h1> Foo Bar </h1>
<div2>
<h1> Foo Bar </h1>
</div2>
<div3> Hello </div3>
</div1>
文檔名稱: index.php
<?php
// Create a new XMLReader instance
$XMLReader = new XMLReader();
// Open the XML file
$XMLReader->open('data.xml');
// Iterate through the XML nodes to
// reach the subtrees of div1
$XMLReader->read();
$XMLReader->read();
$XMLReader->next("div2");
// Print name of element
echo "Before:<br> We are currently"
. "at:$XMLReader->name<br>";
// Move to next node which is
// text "Foo Bar"
$XMLReader->next();
// Move to next element which is div2
$XMLReader->next();
// Print name of element
echo "After:<br> We are currently"
. " at:$XMLReader->name";
?>
輸出:
之前:
We are currently at:div2
後:
We are currently at:div3
參考: https://www.php.net/manual/en/xmlreader.next.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 | XMLReader next() 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。