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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 $xml;
?>
以上例程会输出：
1 3
__toString() is not intended to be called directly.
Instead, it defines what is returned when the object is cast to string, either explicitly with:
(string)$element
Or implicitly, when used in certain contexts which would cause a conversion to string.
[Someone remove that other Patanjali's note, because it has errors! :-(]
For those for whom it may not be immediately obvious from the example, the echo is what is forcing __toString() to be used.
However, to assign the text of a node (but not its children) to a variable:
$XML = new SimpleXMLElement('<p>Hello<span> world</span>.<span> Good day!</span></p>');
$Text = $XML->__toString();
is effectively:
$Text = 'Hello.'; // The <span>s are ignored.
Either of:
$Text = $XML->span->__toString();
$Text = $XML->span[0]->__toString();
is effectively:
$Text = ' world'; // Only the first <span> is used.
$Text = $XML->span[1]->__toString();
is effectively:
$Text = ' Good day!'; // Only the second <span> is used.
For those for whom it may not be immediately obvious from the example, to assign the text of a node (but not its children) to a variable:
$XML = new SimpleXMLElement('<p>Hello<span> world</span>.<span> Good day!</span></p>');
Either:
$Text = $XML;
$Text = $XML->__String();
is effectively:
$Text = 'Hello.'; // The <span>s are ignored.
Either of:
$Text = $XML->span;
$Text = $XML->span[0];
is effectively:
$Text = ' world'; // Only the first <span> is used.
$Text = $XML->span[1];
is effectively:
$Text = ' Good day!'; // Only the second <span> is used.