的test.xml:
<?xml version="1.0"?>
<props>
<prop>
<state statename="Mississippi">
<info>
<code>a1</code>
<location>Jackson</location>
</info>
<info>
<code>d2</code>
<location>Gulfport</location>
</info>
<info>
<code>g6</code>
<location>Hattiesburg</location>
</info>
</state>
<state statename="Texas">
<info>
<code>i9</code>
<location>Dallas</location>
</info>
<info>
<code>a7</code>
<location>Austin</location>
</info>
</state>
<state statename="Maryland">
<info>
<code>s5</code>
<location>Mount Laurel</location>
</info>
<info>
<code>f0</code>
<location>Baltimore</location>
</info>
<info>
<code>h4</code>
<location>Annapolis</location>
</info>
</state>
</prop>
</props>
test.php的
// start the sortCities
function sortCities($a, $b){
return strcmp($a->location, $b->location);
}
// start the sortStates
function sortStates($t1, $t2) {
return strcmp($t1['statename'], $t2['statename']);
}
$props = simplexml_load_file('test.xml');
foreach ($props->prop as $prop) {
$sortedStates = array();
foreach($prop->state as $states) {
$sortedStates[] = $states;
}
usort($sortedStates, "sortStates"); // finish the sortStates
/* --- */
echo '<pre>'."\n";
print_r($sortedStates);
echo '</pre>'."\n";
/* --- */
foreach ($prop->children() as $stateattr) { // this doesn't do it
//foreach($sortedStates as $hotel => @attributes){ // blargh!
if(isset($stateattr->info)) {
$statearr = $stateattr->attributes();
echo '<optgroup label="'.$statearr['statename'].'">'."\n";
$options = array();
foreach($stateattr->info as $info) {
$options[] = $info;
}
usort($options, "sortCities"); // finish the sortCities
foreach($options as $stateattr => $info){
echo '<option value="'.$info->code.'">'.$info->location.'</option>'."\n";
}
echo '</optgroup>'."\n";
} else {
//empty nodes don't do squat
}
}
}
?>
这是以下数组:
print_r($sortedStates);
打印出来:
Array
(
[0] => SimpleXMLElement Object
(
[@attributes] => Array
(
[statename] => Maryland
)
[info] => Array
(
[0] => SimpleXMLElement Object
(
[code] => s5
[location] => Mount Laurel
)
[1] => SimpleXMLElement Object
(
[code] => f0
[location] => Baltimore
)
[2] => SimpleXMLElement Object
(
[code] => h4
[location] => Annapolis
)
)
)
[1] => SimpleXMLElement Object
(
[@attributes] => Array
(
[statename] => Mississippi
)
[info] => Array
(
[0] => SimpleXMLElement Object
(
[code] => a1
[location] => Jackson
)
[1] => SimpleXMLElement Object
(
[code] => d2
[location] => Gulfport
)
[2] => SimpleXMLElement Object
(
[code] => g6
[location] => Hattiesburg
)
)
)
[2] => SimpleXMLElement Object
(
[@attributes] => Array
(
[statename] => Texas
)
[info] => Array
(
[0] => SimpleXMLElement Object
(
[code] => i9
[location] => Dallas
)
[1] => SimpleXMLElement Object
(
[code] => a7
[location] => Austin
)
)
)
)
这样:
// start the sortCities
function sortCities($a, $b){
return strcmp($a->location, $b->location);
}
加上这部分代码:
$options = array();
foreach($stateattr->info as $info) {
$options[] = $info;
}
usort($options, "sortCities"); // finish the sortCities
foreach($options as $stateattr => $info){
echo '<option value="'.$info->code.'">'.$info->location.'</option>'."\n";
}
通过每个optgroup中的“位置”节点进行排序很好。
你可以看到在数组中我可以按属性'statename'进行排序。我遇到的问题是回应和组合这两个函数,以便自动对状态和城市进行排序,并形成所需的选择组。
我尝试复制城市的线路并更改名称,但有几种方法无济于事。
因此,使用上面的XML结构,我试图让它看起来像:
<optgroup label="Maryland">
<option value="h4">Annapolis</option>
<option value="f0">Baltimore</option>
<option value="s5">Mount Laurel</option>
</optgroup>
<optgroup label="Mississippi">
<option value="d2">Gulfport</option>
<option value="g6">Hattiesburg</option>
<option value="a1">Jackson</option>
</optgroup>
<optgroup label="Texas">
<option value="a7">Austin</option>
<option value="i9">Dallas</option>
</optgroup>
无论在XML中按顺序排列状态的顺序如何,无论在状态中的节点中如何排序位置,它们总是在创建optgroup时按字母顺序排序。
Artefacto -
最后2个代码块显示按名称(位置节点)对节点进行排序的功能。
// start the sortCities
function sortCities($a, $b){
return strcmp($a->location, $b->location);
}
// start the sortStates
function sortStates($t1, $t2) {
return strcmp($t1['statename'], $t2['statename']);
}
第二个函数按数组中的属性(statename)进行排序,但是,将两个函数组合在一起,或者更确切地说将它们嵌套,以便按字母顺序对状态和城市进行排序让我感到难过。
@Artefacto,
感谢您的回复。似乎有意义的嵌套方式。问题是,我的服务器都没有运行PHP 5.3。因此泛型函数抛出错误。我应该提到这一点,但没想到。他们正在运行5.2。我一直试图恢复脚本,并且已经陷入了一个部分。
<?php
$doc = simplexml_load_file('test.xml');
$states = get_object_vars($doc->prop->children());
$states = $states["state"];
function sortStates($t1, $t2) {
return strcmp($t1['statename'], $t2['statename']);
};
usort($states, "sortStates");
/* this is just here for testing */
echo '<pre>';
print_r($states);
echo '</pre>';
/* end testing */
/*
array_walk($states,
function (&$state) {
$state = get_object_vars($state);
array_walk($state["info"],
function (&$el) {
$el = get_object_vars($el);
}
);
usort($state["info"],
function($a, $b) { return strcmp($a["location"], $b["location"]); }
);
}
);
*/
?>
以array_walk开头的注释掉的部分。我无法弄清楚如何在下一行死亡时重写'function(&amp; $ state)'。
答案 0 :(得分:2)
您希望根据某些属性或元素值对SimpleXMLElement
列表进行排序。您通常通过将列表转换为数组然后对该数组应用排序来执行此操作。
PHP中有用的功能是iterator_to_array
。它的工作就是将simplexml中那些神奇的东西变成一个更“固定”的数组。
让我们在$result->tour
中说出你的旅游元素。默认情况下,simplexml在这里返回一个迭代器,这是你不能开箱即用的东西。让我们把它转换成一个数组:
$tours = iterator_to_array($result->tour, false);
现在$tours
变量是一个数组,其中包含<tour>
元素作为SimplXMLElement
。您现在可以使用数组函数对该数组进行排序。那些array sorting functions are outlined in the PHP manual和我通常建议How do I sort a multidimensional array in php作为一个很好的起点:
$tourDates = array_map(
function($tour) {return trim($tour->next_bookable_date); },
$tours
);
// sort $tours array by dates, highest to lowest
$success = array_multisort($tourDates, SORT_DESC, $tours);
而且已经是这样了。整个代码一目了然:
$tours = iterator_to_array($result->tour, false);
$tourDates = array_map(
function($tour) {return trim($tour->next_bookable_date); },
$tours
);
// sort $tours array by dates, highest to lowest
$success = array_multisort($tourDates, SORT_DESC, $tours);
foreach ($tours as $tour) {
...
}
答案 1 :(得分:1)
我的方法是将SimpleXMLElement对象转换为数组:
$doc = new SimpleXMLElement($xml);
$states = get_object_vars($doc->prop->children());
$states = $states["state"];
usort($states, function($t1, $t2) { return strcmp($t1['statename'], $t2['statename']); });
array_walk($states,
function (&$state) {
$state = get_object_vars($state);
array_walk($state["info"],
function (&$el) {
$el = get_object_vars($el);
}
);
usort($state["info"],
function($a, $b) { return strcmp($a["location"], $b["location"]); }
);
}
);
答案 2 :(得分:0)
更改此
foreach ($prop->children() as $stateattr)
到这个
foreach ($sortedStates as $stateattr)
做到了。
可能已经发誓我已经尝试过了。