Php 如何在变量中获取特定属性xml值

我有一个xml

<?xml version="1.0" encoding="UTF-8"?>
<nm_response>
    <transaction>
        <transaction_id>111111111</transaction_id>
        <order_description></order_description>
        <first_name>Judith</first_name>
        <last_name>Grosz</last_name>
        <address_1>addresse</address_1>
        <address_2></address_2>
        <company></company>
        <city>Brooklyn</city>
        <state>NY</state>
        <postal_code></postal_code>
        <country>US</country>
        <email>test@test.com</email>
        <phone>99999999999</phone>
        <merchant_defined_field id="1">104647</merchant_defined_field>
        <merchant_defined_field id="2">POS - 1347 - admin</merchant_defined_field>
        <merchant_defined_field id="3">Judith Grosz</merchant_defined_field>
        <merchant_defined_field id="4">8003452000</merchant_defined_field>
        <merchant_defined_field id="5">40784.602953</merchant_defined_field>
        <merchant_defined_field id="6">40784.602953</merchant_defined_field>

        <original_transaction_id>1851413758</original_transaction_id>
        <cc_bin>456331</cc_bin>
        <action>
            <amount>39.95</amount>
            <action_type>sale</action_type>
            <date>20140529081646</date>
            <success>1</success>
            <ip_address></ip_address>

        </action>
      </transaction>
      <transaction>
        <transaction_id>111111111</transaction_id>
        <order_description></order_description>
        <first_name>Judith</first_name>
        <last_name>Grosz</last_name>
        <address_1>addresse</address_1>
        <address_2></address_2>
        <company></company>
        <city>Brooklyn</city>
        <state>NY</state>
        <postal_code></postal_code>
        <country>US</country>
        <email>test@test.com</email>
        <phone>99999999999</phone>
        <merchant_defined_field id="1">104647</merchant_defined_field>
        <merchant_defined_field id="2">POS - 1347 - admin</merchant_defined_field>
        <merchant_defined_field id="13">Judith Grosz</merchant_defined_field>
        <merchant_defined_field id="14">8003452000</merchant_defined_field>
        <merchant_defined_field id="25">40784.602953</merchant_defined_field>
        <merchant_defined_field id="36">40784.602953</merchant_defined_field>

        <original_transaction_id>1851413758</original_transaction_id>
        <cc_bin>456331</cc_bin>
        <action>
            <amount>39.95</amount>
            <action_type>sale</action_type>
            <date>20140529081646</date>
            <success>1</success>
            <ip_address></ip_address>

        </action>
      </transaction>
</nm_response>

很好。 但我的问题是如何在不同的变量中定义所有的merchant__字段

$var1=value of merchant_defined_field id="2";
$var2=value of merchant_defined_field id="3"
$var3=value of merchant_defined_field id="13"
$var4=value of merchant_defined_field id="36" 

$var1=$Array[“交易”][“商户定义字段”][0]；
echo$var1.“
”；
$var2=$Array[“交易”][“商户定义字段”][1]；
echo$var2.“
”；；

---

注意[“transaction”][“merchant_defined_field”]数组从索引0开始有一个偏移量

尝试

${}

创建动态变量，并使用循环将值存储在

$i=1;
foreach($Array['transaction']['merchant_defined_field'] as $m) {
   ${"merchant_defined_field" . $i}  = $m;
  $i++;
}
echo $merchant_defined_field1;
echo $merchant_defined_field2;
echo $merchant_defined_field3;
echo $merchant_defined_field4;

要获取id属性，请尝试

$xml=simplexml_load_string($xml);
$i=1;
foreach($xml->transaction->merchant_defined_field as $m) {
   ${"merchant_defined_field_id" . $i}  = $m->attributes()->id;
  $i++;
}
echo $merchant_defined_field_id1;
echo $merchant_defined_field_id2;
echo $merchant_defined_field_id3;
echo $merchant_defined_field_id4;

试试这个：

$xml = simplexml_load_string($xml);
var_dump($xml->transaction->merchant_defined_field->attributes()->id);

---

现在检查get id attributes，但它是动态的，不是固定的。任何id都位于任何位置。请确保您的

xml

格式正确，因为它与OP

xml

一起工作正常，请检查此处

$xml=simplexml_load_string($xml);
$i=1;
foreach($xml->transaction->merchant_defined_field as $m) {
   ${"merchant_defined_field_id" . $i}  = $m->attributes()->id;
  $i++;
}
echo $merchant_defined_field_id1;
echo $merchant_defined_field_id2;
echo $merchant_defined_field_id3;
echo $merchant_defined_field_id4;

$xml = simplexml_load_string($xml);
var_dump($xml->transaction->merchant_defined_field->attributes()->id);