php5中的simplexml

php5中,增加了一个simplexml的XML扩展,处理XML起来比较方便,现举例子说明并学习之

一个样本XML

<?xml version='1.0' ?>

<contacts>

<contact idx="37">

<name>Ramsey White II</name>

<category>Family</category>

<phone type="home">301-555-1212</phone>

<meta id="x634724" />

</contact>

<contact idx="42">

<name>Stratis Kakadelis</name>

<category>Friends</category>

<phone type="home">240-555-1212</phone>

<phone type="work">410-555-7676</phone>

<email>[email protected]</email>

<meta id="y49302" />

</contact>

<contact idx="57">

<name>Kelly Williamson</name>

<category>Friends</category>

<phone type="cell">443-555-9999</phone>

<email>[email protected]</email>

<email>[email protected]</email>

<meta id="w4r302" />

</contact>

</contacts>
第一个例子


<?php

// Using SimpleXML, read the file into memory:

$xml = simplexml_load_file('contacts.xml');

// Let's print out a formatted version of some of this contact data:

// Start with an ordered list:

echo "<ol>\n";

// Loop over each contact:

foreach ($xml->contact as $c) {

// Print their name:

echo '<li>' . $c->name;

// Now start an Unordered list for their phone numbers:

echo '<ul>';

// Loop over every phone number for this person:

foreach ($c->phone as $p) {

// Echo out a line including the type of number:

// The attribute will be accesible as if it were an assoc array

// entry.  Using the entry itself, will echo it's value.

echo '<li>', ucfirst($p['type']), ': ', $p, '</li>';

}

// Close off the phone list:

echo "</ul></li>\n";

}

?>

 

第二个例子是用XPATH的,很简单，没啥好说的,人家的英文注释都说了
<?php
// Using SimpleXML, read the file into memory:
$xml = simplexml_load_file('contacts.xml');

// Xpath search to find all 'meta' tags no matter what the depth:
$meta = $xml->xpath('//meta');

// Loop over them and output their IDs
foreach ($meta as $m) {
    echo "Meta - {$m['id']}<br />\n";
}

// Find all email tags within a contact tag from the root of the XML document:
$email = $xml->xpath('/contacts/contact/email');

// Loop over them and output the email addreses:
foreach ($email as $e) {
    echo "Email - {$e}<br />\n";
}

// Finally, find any contact who has a cellphone number
$cell = $xml->xpath('contact/phone[@type="cell"]/..');

// Loop over them and output their names:
foreach ($cell as $c) {
    echo "Cell Contact - {$c->name}<br />\n";
}
?>