Read XML dynamic PHP | 易学教程

问题

in my site in PHP I want to read an xml file like this:

<?xml version="1.0" standalone="yes"?>
<RETURNDATA lang="it-IT" type="COR" xsi:noNamespaceSchemaLocation="http://xmlv5test.travco.co.uk/trlink/schema/CountryRequestV6Rcv.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <MESSAGE>All Countries details and relevant city details</MESSAGE>
    <DATA COUNTRY_CODE="ABW" CURRENCY_CODE="EUR">
        <COUNTRY_NAME>Aruba</COUNTRY_NAME>
        <CURRENCY_NAME>euro</CURRENCY_NAME>
        <COUNTRY_CITIES>
            <CITY_DATA CITY_CODE="AUA">
                <CITY_NAME>Aruba</CITY_NAME>
            </CITY_DATA>
        </COUNTRY_CITIES>
    </DATA>
    <DATA COUNTRY_CODE="ALB" CURRENCY_CODE="EUR">
        <COUNTRY_NAME>Albania</COUNTRY_NAME>
        <CURRENCY_NAME>euro</CURRENCY_NAME>
        <COUNTRY_CITIES>
            <CITY_DATA CITY_CODE="TIA">
                <CITY_NAME>Tirana</CITY_NAME>
            </CITY_DATA>
        </COUNTRY_CITIES>
    </DATA>
    <DATA COUNTRY_CODE="ARE" CURRENCY_CODE="EUR">
        <COUNTRY_NAME>Emirati Arabi Uniti</COUNTRY_NAME>
        <CURRENCY_NAME>euro</CURRENCY_NAME>
        <COUNTRY_CITIES>
            <CITY_DATA CITY_CODE="DXB">
                <CITY_NAME>Dubai</CITY_NAME>
            </CITY_DATA>
            <CITY_DATA CITY_CODE="AAI">
                <CITY_NAME>Al Ain</CITY_NAME>
            </CITY_DATA>
            <CITY_DATA CITY_CODE="FJR">
                <CITY_NAME>Fujaira</CITY_NAME>
            </CITY_DATA>
            <CITY_DATA CITY_CODE="SSH">
                <CITY_NAME>Sharja</CITY_NAME>
            </CITY_DATA>
            <CITY_DATA CITY_CODE="RKT">
                <CITY_NAME>Ras al-Khaimah</CITY_NAME>
            </CITY_DATA>
            <CITY_DATA CITY_CODE="AUH">
                <CITY_NAME>Abu Dhabi</CITY_NAME>
            </CITY_DATA>
         </COUNTRY_CITIES>
     </DATA>
</RETURNDATA>

I want to enter in each node name DATA and take:
COUNTRY_CODE
CURRENCY_CODE
COUNTRY_NAME
CURRENCY_NAME
And all ountry cities code and name into an array associative.

I have tried with SimpleXML, but the XML is dynamic and I wanto to optimize my cycle because I can have a very big and large XML (this is only a little part of It).

$xml_str = file_get_contents('xml/country.xml');
    $xml = new SimpleXMLElement($xml_str);
    echo $xml->getName(), PHP_EOL;
    foreach($xml as $name => $part) {
       echo "$name: $part", PHP_EOL;
    }

I want to create a very otpimize cycle to take my value

回答1:

Use the following style to acces only the <DATA> child elements in the root element:

foreach ($xml->DATA as $name => $part) {

Also please check the SimpleXML Introduction it should have some good examples for you showing different ways how to do the basic stuff with SimpleXML. The documentation is pretty good.

回答2:

you could use the XML parser directly, this would more than likely be the most efficient way

set_time_limit(0);
define('__BUFFER_SIZE__', 131072);
define('__XML_FILE__', 'pf_1360591.xml');

function elementStart($p, $n, $a) {
  //handle opening of elements
}

function elementEnd($p, $n) {
  //handle closing of elements
}

function elementData($p, $d) {
  //handle cdata in elements
}

$xml = xml_parser_create();

xml_parser_set_option($xml, XML_OPTION_TARGET_ENCODING, 'UTF-8');
xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);
xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);

xml_set_element_handler($xml, 'elementStart', 'elementEnd');
xml_set_character_data_handler($xml, 'elementData');

$f = fopen(__XML_FILE__, 'r');
if($f) {
  while(!feof($f)) {
    $content = fread($f, __BUFFER_SIZE__);

    xml_parse($xml, $content, feof($f));

    unset($content);
  }
  fclose($f);
}

来源：https://stackoverflow.com/questions/15273870/read-xml-dynamic-php

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xml

simplexml