PHP SimpleXML用法之二

這裏說明產生XML樹的方法，由於PHP SimpleXML無法單獨產生XML樹，所以這裏我們用DOM來達成。

<?php

try
{
    /*** a new dom object ***/
    $dom = new domDocument;

    /*** make the output tidy ***/
    $dom->formatOutput = true;

    /*** create the root element ***/
    $root = $dom->appendChild($dom->createElement( "user" ));

    /*** create the simple xml element ***/
    $sxe = simplexml_import_dom( $dom );

    /*** add a firstname element ***/
    $sxe->addChild("firstname", "John");

    /*** add a surname element ***/
    $sxe->addChild("surname", "Brady");

    /*** echo the xml ***/
    echo $sxe->asXML();
}
catch( Exception $e )
{
    echo $e->getMessage();
}
?>

上式所產生的XML樹如下

<?xml version="1.0"?>
<user>
  <firstname>John</firstname>
  <surname>Brady</surname>
</user>

上例完成後再來思考一個問題，如果我們再子樹下還要建立子樹該怎麼做呢，請看下例。

<?php

try
{
    /*** a new dom object ***/
    $dom = new domDocument;

    /*** make the output tidy ***/
    $dom->formatOutput = true;

    /*** create the root element ***/
    $root = $dom->appendChild($dom->createElement( "users" ));

    /*** create the simple xml element ***/
    $sxe = simplexml_import_dom( $dom );

    /*** add a user node ***/
    $user = $sxe->addchild("user");

    /*** add a firstname element ***/
    $user->addChild("firstname", "John");

    /*** add a surname element ***/
    $user->addChild("surname", "Brady");

    /*** add address element ***/
    $user->addChild("address", "1 Bunch St");

    /*** add the city element ***/
    $user->addChild("city", "Downtown");

    /*** add the country ***/
    $user->addChild("country", "America");

    $contact = $user->addChild("contact");
    $contact->addChild("phone", "4444 4444");
    $contact->addChild("url", "http://phpro.org");
    $contact->addChild("email", "brady@bunch.example.com");

    echo $sxe->asXML();
}
catch( Exception $e )
{
    echo $e->getMessage();
}
?>

上式所得之結果為

<?xml version="1.0"?>
<users>
  <user>
    <firstname>John</firstname>
    <surname>Brady</surname>
    <address>1 Bunch St</address>
    <city>Downtown</city>
    <country>America</country>
    <contact>
      <phone>4444 4444</phone>
      <url>http://phpro.org</url>
      <email>brady@bunch.example.com</email>
    </contact>
  </user>
</users>

再來一個範例說明如何為NODE增加屬性

<?php

try
{
    /*** a new dom object ***/
    $dom = new domDocument;

    /*** make the output tidy ***/
    $dom->formatOutput = true;

    /*** create the root element ***/
    $root = $dom->appendChild($dom->createElement( "users" ));

    /*** create the simple xml element ***/
    $sxe = simplexml_import_dom( $dom );

    /*** add a user node ***/
    $user = $sxe->addchild("user");

    /*** add a firstname element ***/
    $user->addChild("firstname", "John");

    /*** add a surname element ***/
    $user->addChild("surname", "Brady");

    /*** add address element ***/
    $user->addChild("address", "1 Bunch St");

    /*** add the city element ***/
    $user->addChild("city", "Downtown");

    /*** add the country ***/
    $user->addChild("country", "America");

    /*** add the contact element ***/
    $contact = $user->addChild("contact");

    /*** add children to the contact element ***/
    $phone = $contact->addChild("phone", "4444 4444");

    /*** add an attribute to the phone element ***/
    $phone->addAttribute("type", "mobile");

    /*** more children for the contact element ***/
    $contact->addChild("url", "http://phpro.org");
    $contact->addChild("email", "brady@bunch.example.com");

    /*** show the xml ***/
    echo $sxe->asXML();
}
catch( Exception $e )
{
    echo $e->getMessage();
}
?>

上式所得之結果為

<?xml version="1.0"?>
<users>
  <user>
    <firstname>John</firstname>
    <surname>Brady</surname>
    <address>1 Bunch St</address>
    <city>Downtown</city>
    <country>America</country>
    <contact>
      <phone type="mobile">4444 4444</phone>
      <url>http://phpro.org</url>
      <email>brady@bunch.example.com</email>
    </contact>
  </user>
</users>

上面我們已經做過了取單一NODE的方法，下面用FOREACH來取得所有NODE PHONE部分之屬性

<?xml version="1.0" encoding="utf-8"?>
<users>
  <user>
    <firstname>Sheila</firstname>
    <surname>Green</surname>
    <address>2 Good St</address>
    <city>Campbelltown</city>
    <country>Australia</country>
    <contact>
      <phone type="mobile">1234 1234</phone>
      <url>http://example.com</url>
      <email>pamela@example.com</email>
    </contact>
    </user>
    <user>
    <firstname>Bruce</firstname>
    <surname>Smith</surname>
    <address>1 Yakka St</address>
    <city>Meekatharra</city>
    <country>Australia</country>
    <contact>
      <phone type="landline">4444 4444</phone>
      <url>http://yakka.example.com</url>
      <email>bruce@yakka.example.com</email>
    </contact>
  </user>
  <user>
    <firstname>Davo</firstname>
    <surname>White</surname>
    <address>The Only Way</address>
    <city>Whitefall</city>
    <country>Australia</country>
    <contact>
      <phone type="mobile">8888 8888</phone>
      <url>http://white.example.com</url>
      <email>davo@white.example.com</email>
    </contact>
  </user>
  <user>
    <firstname>Shazza</firstname>
    <surname>Green</surname>
    <address>222 Great Western Hwy</address>
    <city>Bathurst</city>
    <country>Australia</country>
    <contact>
      <phone type="fax">6666 6666</phone>
      <url>http://shazza.green.example.com</url>
      <email>shazza@green.example.com</email>
    </contact>
  </user>
</users>

<?php

    /*** create a SimpleXML object ***/
    if( ! $xml = simplexml_load_file("address.xml") )
    {
    echo "Unable to load XML file";
    }
    else
    {
    $i = 0;
    /*** loop over the elements ***/
    foreach($xml as $node)
    {
        echo $xml->user[$i]->contact->phone->attributes().'<br />';
        $i++;
    }

    }
?>

得到之結果為


mobilel

andline

mobile

fax


                                                                                          
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                                                     update : 2010/3/25