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simplexml_load_file(string,class,options,ns,is_prefix)
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class ¿ÉÑ¡¡£¹æ¶¨Ð¶ÔÏóµÄ class¡£
options ¿ÉÑ¡¡£¹æ¶¨¸½¼ÓµÄ Libxml ²ÎÊý¡£
ns ¿ÉÑ¡¡£
is_prefix ¿ÉÑ¡¡£

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<?php
$xmlstring = <<<XML
<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>George</to>
<from>John</from>
<heading>Reminder</heading>
<body>Don't forget the meeting!</body>
</note>
XML;

$xml = simplexml_load_string($xmlstring);

var_dump($xml);
?>

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object(SimpleXMLElement)#1 (4)
{
["to"]=> string(4) "George"
["from"]=> string(4) "John"
["heading"]=> string(8) "Reminder"
["body"]=> string(29) "Don't forget the meeting!"
}
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