在标签中搜索单词（BRL）并输出此标签的全部内容

Question

xml文件中有几个标签。如何找到包含“ BRL”中内容的标签？

我试过了

$usd_brazilRate = $usdXML->item[89]->title;<br>

$usd_brazilDate = $usdXML->item[89]->pubDate;<br>

但是项目编号（位置）总是变化

示例裁剪的xml内容：

<channel>

<item>

        <title>1 USD = 64.78833120 RUB</title>

        <link>http://www.floatrates.com/usd/rub/</link>

        <description>1 U.S. Dollar = 64.78833120 Russian Rouble</description>

        <pubDate>Thu, 2 May 2019 12:00:02 GMT</pubDate>

        <baseCurrency>USD</baseCurrency>

        <baseName>U.S. Dollar</baseName>

        <targetCurrency>RUB</targetCurrency>

        <targetName>Russian Rouble</targetName>

        <exchangeRate>64.78833120</exchangeRate>

        <inverseRate>0.01543488</inverseRate>

        <inverseDescription>1 Russian Rouble = 0.01543488 U.S. Dollar</inverseDescription>

    </item>

    <item>

        <title>1 USD = 3.92245587 BRL</title>

        <link>http://www.floatrates.com/usd/brl/</link>

        <description>1 U.S. Dollar = 3.92245587 Brazilian Real</description>

        <pubDate>Thu, 2 May 2019 12:00:02 GMT</pubDate>

        <baseCurrency>USD</baseCurrency>

        <baseName>U.S. Dollar</baseName>

        <targetCurrency>BRL</targetCurrency>

        <targetName>Brazilian Real</targetName>

        <exchangeRate>3.92245587</exchangeRate>

        <inverseRate>0.25494232</inverseRate>

        <inverseDescription>1 Brazilian Real = 0.25494232 U.S. Dollar</inverseDescription>

    </item>

  

输出

1 USD = 3.92245587 BRL

Thu，2019年5月2日12:00:02 GMT