Question

我无法重复爆炸的lat和lng值。保持只返回数据库中的一对（x，y）值。

请参阅以下代码：

<?php
$feed = file_get_contents("http://api.geograph.org.uk/syndicator.php?key=hfALmNnpQ&i=14102530&page=1&format=media&expand=1&perpage=100");
$xml = new SimpleXmlElement($feed);
foreach ($xml->item as $entry){
echo $entry->title;
echo $entry->description;
echo $entry->link;

// use that namespace
$dc = $entry->children('http://purl.org/dc/elements/1.1/');
$georss = $entry->children('http://www.georss.org/georss');
echo $entry->children('http://purl.org/dc/elements/1.1/')->creator;
echo $entry->children('http://www.georss.org/georss')->point
list($lat,$lng) = explode(' ', $entry->children('http://www.georss.org/georss')->point);
}
?>

下面的代码显示了数据库操作：

<?php
require 'table.php';

// Opens a connection to a PostgresSQL server
$connection = pg_connect("dbname=postgis user=postgres password=****");


// Execute query        

foreach ($xml->item as $entry) { 

$query = "INSERT INTO geognew(title, link, author, latitude, longitude) VALUES ('" . $entry->title . "', '" . $entry->link . "', '" . $entry->children('http://purl.org/dc/elements/1.1/')->creator . "', '" . $lat . "', '" . $lng . "')";

$result = pg_query($query);
printf ("These values are inserted into the database - %s %s %s", $entry->title, $entry->link, $entry->children('http://purl.org/dc/elements/1.1/')->creator, $lat, $lng);
}

pg_close();

?>

由于 Yemi

Answer 1

我没有在课堂上定义SimpleXmlElement::item()。是的意思是SimpleXmlElement::children?

意思是：

foreach ($xml->children() as $entry) { ... }

Answer 2

最好保存数组中的lat / lng。因为反复迭代xml是一种过度杀伤。

// define this $points outside the foreach loop
$points = array();

foreach(...){
....
    list($lat,$lng) = explode(' '
           , (string)($entry->children('http://www.georss.org/georss')->point));
    $points[] = array('lat'=> $lat, 'long' => $lng);
}

这是一个完整的代码，只能通过纬度和经度进行迭代。

$xml = simplexml_load_string($feed);
$namespaces = $xml->getNameSpaces(true);
foreach ($xml->item as $entry){
    $georss = $entry->children($namespaces['georss']);
    list($lat,$lng) = explode(' ', (string)$georss->point);
    echo "$lat, $lng\n";
}

迭代爆炸值

2 个答案: