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SimpleXMLElement::__toString — Returns the string content
Returns text content that is directly in this element. Does not return text content that is inside this element's children.
此函数没有参数。
Returns the string content on success or an empty string on failure.
Example #1 Get string content
<?php
$xml = new SimpleXMLElement('<a>1 <b>2 </b>3</a>');
echo $xml;
?>
以上例程会输出：
1 3