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>skak@example.com</email><meta id="y49302" /></contact><contact idx="57"><name>Kelly Williamson</name><category>Friends</category><phone type="cell">443-555-9999</phone><email>kwill@example.com</email><email>dynky@tech.example.com</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";
}
?>
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