假如有下面xml文件：
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<span style="font-family:SimSun;"><?xml version="1.0" encoding="UTF-8"?><setting> <setting1>setting1 value</setting1> <setting2>setting2 value</setting2> <setting3>setting3 value</setting3> .... .... ....</setting></span>
立即学习“PHP免费学习笔记（深入）”；
立即学习“PHP免费学习笔记（深入）”；
// CREATE$config = new SimpleXmlElement('<settings/>');$config->setting1 = 'setting1 value'; $config->saveXML('config.xml'); // READ$config = new SimpleXmlElement('config.xml');echo $config->setting1;echo $config->asXml();// UPDATE$config->setting1 = 'new value';$config->setting2 = 'setting2 value';echo $config->asXml();// DELETEunset($config->setting1);$config->setting2 = NULL;echo $config->asXML();unlink('config.xml');立即学习“PHP免费学习笔记（深入）”；
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