Php SimpleXMLElement:：addChild（）不工作

在我的php代码中，我有两个变量

$parent

和

$child

。它们都有一些xml数据。在

$parent

变量中有一个名为

的标记，它可能包含多个

标记。在

$child

变量中只有一个

标记。我想要的是，我想在

$parent

变量的

标记的末尾添加该子项。我的代码如下：

<?php

$parent = new SimpleXMLElement('<review_sr><status>Review Complete</status><payheads><payhead><code>ABAS</code><old_value>0.00</old_value><new_value>63570.00</new_value><review_id>1234567890</review_id><review_time>20160614:11:00:47</review_time><status>Accepted</status></payhead></payheads><current_gross_allowance>50481.00</current_gross_allowance><review_gross_allowance>114051.00</review_gross_allowance></review_sr>');

$child = new SimpleXMLElement('<source><payhead><code>DMG</code><old_value>500.00</old_value><new_value>0.00</new_value><review_id>1234567890</review_id><review_time>20160620:12:41:17</review_time><status>Accepted</status></payhead></source>');
$child = $child->xpath('//payhead'); //This is to ignore the xml declaration that is automatically produced by the SimpleXMLElement constructor
$child = $child[0];                 //I've tried LIBXML_NOXMLDECL  but its not working, that's why these two lines.

//var_dump($parent);
//var_dump($child->asXML());

$parentNode = $parent->xpath('//payheads');
$parentNode[0]->addChild('payhead', $child);
//var_dump($parentNode[0]);
foreach($parent as $key=>$value)
    foreach($value as $key=>$value)
        var_dump($value); //only 1 payhead is shown. but there should be 2 of them.

?>  

实际产量：

object(SimpleXMLElement)[5]
  public 'code' => string 'ABAS' (length=4)
  public 'old_value' => string '0.00' (length=4)
  public 'new_value' => string '63570.00' (length=8)
  public 'review_id' => string '1234567890' (length=10)
  public 'review_time' => string '20160614:11:00:47' (length=17)
  public 'status' => string 'Accepted' (length=8)

object(SimpleXMLElement)[6]

object(SimpleXMLElement)[5]
  public 'code' => string 'ABAS' (length=4)
  public 'old_value' => string '0.00' (length=4)
  public 'new_value' => string '63570.00' (length=8)
  public 'review_id' => string '1234567890' (length=10)
  public 'review_time' => string '20160614:11:00:47' (length=17)
  public 'status' => string 'Accepted' (length=8)

object(SimpleXMLElement)[6]  
  public 'code' => string 'DMG' (length=4)
  public 'old_value' => string '500.00' (length=4)
  public 'new_value' => string '0.00' (length=8)
  public 'review_id' => string '1234567890' (length=10)
  public 'review_time' => string '20160620:12:41:17' (length=17)
  public 'status' => string 'Accepted' (length=8)

预期产出：

object(SimpleXMLElement)[5]
  public 'code' => string 'ABAS' (length=4)
  public 'old_value' => string '0.00' (length=4)
  public 'new_value' => string '63570.00' (length=8)
  public 'review_id' => string '1234567890' (length=10)
  public 'review_time' => string '20160614:11:00:47' (length=17)
  public 'status' => string 'Accepted' (length=8)

object(SimpleXMLElement)[6]

object(SimpleXMLElement)[5]
  public 'code' => string 'ABAS' (length=4)
  public 'old_value' => string '0.00' (length=4)
  public 'new_value' => string '63570.00' (length=8)
  public 'review_id' => string '1234567890' (length=10)
  public 'review_time' => string '20160614:11:00:47' (length=17)
  public 'status' => string 'Accepted' (length=8)

object(SimpleXMLElement)[6]  
  public 'code' => string 'DMG' (length=4)
  public 'old_value' => string '500.00' (length=4)
  public 'new_value' => string '0.00' (length=8)
  public 'review_id' => string '1234567890' (length=10)
  public 'review_time' => string '20160620:12:41:17' (length=17)
  public 'status' => string 'Accepted' (length=8)

---

我做错了什么？

addChild

接受字符串参数-第一个是要创建的标记名，（可选）第二个是它的文本内容，（可选）第三个是元素的名称空间

您不能只是将另一个元素传递给它以供使用。对于这种操作，

simplexmlement

似乎实际上太简单了

取而代之的是，考虑使用<代码> DOMBODC/<代码>，类似于：

<?php
$parent = new DOMDocument();
$parent->loadXML('<review_sr><status>Review Complete</status><payheads><payhead><code>ABAS</code><old_value>0.00</old_value><new_value>63570.00</new_value><review_id>1234567890</review_id><review_time>20160614:11:00:47</review_time><status>Accepted</status></payhead></payheads><current_gross_allowance>50481.00</current_gross_allowance><review_gross_allowance>114051.00</review_gross_allowance></review_sr>');

$child = new DOMDocument();
$child->loadXML('<source><payhead><code>DMG</code><old_value>500.00</old_value><new_value>0.00</new_value><review_id>1234567890</review_id><review_time>20160620:12:41:17</review_time><status>Accepted</status></payhead></source>');
$childNode = $child->getElementsByTagName('payhead')->item(0);

$parentNode = $parent->getElementsByTagName('payheads')->item(0);
$parentNode->appendChild($child);
foreach($parent->getElementsByTagName('payhead') as $payhead) {
    var_dump($payhead);
}

如果需要，您可以将这些工资单传递给

simplexmlement

，以非常简单的方式获取其属性：

$simplePayhead = simplexml_import_dom($payhead);
var_dump($simplePayhead);

---

请试试这个。问题是simplexmlelement的

addChild（）

需要一个字符串，而您正试图附加一个它类型转换为null的对象

公共SimpleXMLElement SimpleXMLElement:：addChild（字符串$name[，字符串$value[，字符串$namespace]]）

您需要使用DOM并将子对象添加到DOM中

function sxml_append(SimpleXMLElement $to, SimpleXMLElement $from) {
    $toDom = dom_import_simplexml($to);
    $fromDom = dom_import_simplexml($from);
    $toDom->appendChild($toDom->ownerDocument->importNode($fromDom, true));
}

$parent = new SimpleXMLElement('<review_sr><status>Review Complete</status><payheads><payhead><code>ABAS</code><old_value>0.00</old_value><new_value>63570.00</new_value><review_id>1234567890</review_id><review_time>20160614:11:00:47</review_time><status>Accepted</status></payhead></payheads><current_gross_allowance>50481.00</current_gross_allowance><review_gross_allowance>114051.00</review_gross_allowance></review_sr>');

$child = new SimpleXMLElement('<source><payhead><code>DMG</code><old_value>500.00</old_value><new_value>0.00</new_value><review_id>1234567890</review_id><review_time>20160620:12:41:17</review_time><status>Accepted</status></payhead></source>');
$child = $child->xpath('//payhead'); //This is to ignore the xml declaration that is automatically produced by the SimpleXMLElement constructor
$child = $child[0];                 //I've tried LIBXML_NOXMLDECL  but its not working, that's why these two lines.

$parentNode = $parent->xpath('//payheads');
sxml_append($parentNode[0],$child[0]);

var_dump($parent);

---

是的，我现在就是这样做的。我只是想知道为什么我的代码不起作用。simplexmlelement的addChild（）需要一个字符串，而您正试图附加一个它类型转换为null的对象。您需要使用DOM并将子对象追加到DOM中。