范例


When using simplexml to access a element the returned object may be a SimpleXMLElement instead of a string.


Example:


<?php

$string = <<<XML

<?xml version='1.0'?>

<document>

    <cmd>login</cmd>

    <login>Richard</login>

</document>

XML;

                                                                        

                                           

$xml = simplexml_load_string($string);

print_r($xml);

$login = $xml->login;

print_r($login);

$login = (string) $xml->login;

print_r($login);

?>



Expected result:

----------------

SimpleXMLElement Object

(

    [cmd] => login

    [login] => Richard

)

Richard

Richard


Actual result:

--------------

SimpleXMLElement Object

(

    [cmd] => login

    [login] => Richard

)

SimpleXMLElement Object

(

    [0] => Richard

)

Richard


But this is an intended behavior. See http://bugs.php.net/bug.php?id=29500

down

-6

mike at mike-griffiths dot co dot uk ¶

14 years ago


It is important that you select the correct method of loading the XML in depending on the format of your XML file.

If you use the wrong function to load it in you will get some strange errors.

down

-23

Kari P. ¶

13 years ago


To take care of proper error checking, one must use try-catch blocks:


<?php

try {

  $sxe = new SimpleXMLElement($xmlstring);

} catch (Exception $e) {

  echo "bad xml";

}

?>



To get rid of warnings, use @ in front of new:


<?php

try {

  $sxe = @new SimpleXMLElement($xmlstring);

} catch (Exception $e) {

  echo "bad xml";

}

?>

down

-33

info at accountr dot eu ¶

13 years ago


Instead of using  <?php eval($code) ?>

you can use this method,

<?php

$node = "node";

$XML = simplexml_load_file($file);

$text = (string)$XML->nodes->{$node}; // works
// or
$text2 = (string)$XML->{$node}->child; // also works fine

?>

I think it is much more easier instead of eval().

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官方地址：https://www.php.net/manual/en/simplexml.examples.php

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