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 BRLThu,2019年5月2日12:00:02 GMT
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