Google finance calculator - Currency conversion in php

<?
function currency($from, $to, $amount){
   $content = file_get_contents('https://www.google.com/finance/converter?a='.$amount.'&from='.$from.'&to='.$to);
   $doc = new DOMDocument;
   @$doc->loadHTML($content);
   $xpath = new DOMXpath($doc);
   $result = $xpath->query('//*[@id="currency_converter_result"]/span')->item(0)->nodeValue;
   $converted = str_replace(' '.$to, '', $result);
   return round($converted, 3);
}

echo $currentval = currency('USD', 'INR', 1); // returns 0.7216
?>
 AED => United Arab Emirates Dirham (AED)
    AFN => Afghan Afghani (AFN)
    ALL => Albanian Lek (ALL)
    AMD => Armenian Dram (AMD)
    ANG => Netherlands Antillean Guilder (ANG)
    AOA => Angolan Kwanza (AOA)
    ARS => Argentine Peso (ARS)
    AUD => Australian Dollar (A$)
    AWG => Aruban Florin (AWG)
    AZN => Azerbaijani Manat (AZN)
    BAM => Bosnia-Herzegovina Convertible Mark (BAM)
    BBD => Barbadian Dollar (BBD)
    BDT => Bangladeshi Taka (BDT)
    BGN => Bulgarian Lev (BGN)
    BHD => Bahraini Dinar (BHD)
    BIF => Burundian Franc (BIF)
    BMD => Bermudan Dollar (BMD)
    BND => Brunei Dollar (BND)
    BOB => Bolivian Boliviano (BOB)
    BRL => Brazilian Real (R$)
    BSD => Bahamian Dollar (BSD)
    BTN => Bhutanese Ngultrum (BTN)
    BWP => Botswanan Pula (BWP)
    BYR => Belarusian Ruble (BYR)
    BZD => Belize Dollar (BZD)
    CAD => Canadian Dollar (CA$)
    CDF => Congolese Franc (CDF)
    CHF => Swiss Franc (CHF)
    CLF => Chilean Unit of Account (UF) (CLF)
    CLP => Chilean Peso (CLP)
    CNH => CNH (CNH)
    CNY => Chinese Yuan (CN¥)
    COP => Colombian Peso (COP)
    CRC => Costa Rican Colón (CRC)
    CUP => Cuban Peso (CUP)
    CVE => Cape Verdean Escudo (CVE)
    CZK => Czech Republic Koruna (CZK)
    DEM => German Mark (DEM)
    DJF => Djiboutian Franc (DJF)
    DKK => Danish Krone (DKK)
    DOP => Dominican Peso (DOP)
    DZD => Algerian Dinar (DZD)
    EGP => Egyptian Pound (EGP)
    ERN => Eritrean Nakfa (ERN)
    ETB => Ethiopian Birr (ETB)
    EUR => Euro (€)
    FIM => Finnish Markka (FIM)
    FJD => Fijian Dollar (FJD)
    FKP => Falkland Islands Pound (FKP)
    FRF => French Franc (FRF)
    GBP => British Pound Sterling (£)
    GEL => Georgian Lari (GEL)
    GHS => Ghanaian Cedi (GHS)
    GIP => Gibraltar Pound (GIP)
    GMD => Gambian Dalasi (GMD)
    GNF => Guinean Franc (GNF)
    GTQ => Guatemalan Quetzal (GTQ)
    GYD => Guyanaese Dollar (GYD)
    HKD => Hong Kong Dollar (HK$)
    HNL => Honduran Lempira (HNL)
    HRK => Croatian Kuna (HRK)
    HTG => Haitian Gourde (HTG)
    HUF => Hungarian Forint (HUF)
    IDR => Indonesian Rupiah (IDR)
    IEP => Irish Pound (IEP)
    ILS => Israeli New Sheqel (₪)
    INR => Indian Rupee (Rs.)
    IQD => Iraqi Dinar (IQD)
    IRR => Iranian Rial (IRR)
    ISK => Icelandic Króna (ISK)
    ITL => Italian Lira (ITL)
    JMD => Jamaican Dollar (JMD)
    JOD => Jordanian Dinar (JOD)
    JPY => Japanese Yen (¥)
    KES => Kenyan Shilling (KES)
    KGS => Kyrgystani Som (KGS)
    KHR => Cambodian Riel (KHR)
    KMF => Comorian Franc (KMF)
    KPW => North Korean Won (KPW)
    KRW => South Korean Won (₩)
    KWD => Kuwaiti Dinar (KWD)
    KYD => Cayman Islands Dollar (KYD)
    KZT => Kazakhstani Tenge (KZT)
    LAK => Laotian Kip (LAK)
    LBP => Lebanese Pound (LBP)
    LKR => Sri Lankan Rupee (LKR)
    LRD => Liberian Dollar (LRD)
    LSL => Lesotho Loti (LSL)
    LTL => Lithuanian Litas (LTL)
    LVL => Latvian Lats (LVL)
    LYD => Libyan Dinar (LYD)
    MAD => Moroccan Dirham (MAD)
    MDL => Moldovan Leu (MDL)
    MGA => Malagasy Ariary (MGA)
    MKD => Macedonian Denar (MKD)
    MMK => Myanma Kyat (MMK)
    MNT => Mongolian Tugrik (MNT)
    MOP => Macanese Pataca (MOP)
    MRO => Mauritanian Ouguiya (MRO)
    MUR => Mauritian Rupee (MUR)
    MVR => Maldivian Rufiyaa (MVR)
    MWK => Malawian Kwacha (MWK)
    MXN => Mexican Peso (MX$)
    MYR => Malaysian Ringgit (MYR)
    MZN => Mozambican Metical (MZN)
    NAD => Namibian Dollar (NAD)
    NGN => Nigerian Naira (NGN)
    NIO => Nicaraguan Córdoba (NIO)
    NOK => Norwegian Krone (NOK)
    NPR => Nepalese Rupee (NPR)
    NZD => New Zealand Dollar (NZ$)
    OMR => Omani Rial (OMR)
    PAB => Panamanian Balboa (PAB)
    PEN => Peruvian Nuevo Sol (PEN)
    PGK => Papua New Guinean Kina (PGK)
    PHP => Philippine Peso (Php)
    PKG => PKG (PKG)
    PKR => Pakistani Rupee (PKR)
    PLN => Polish Zloty (PLN)
    PYG => Paraguayan Guarani (PYG)
    QAR => Qatari Rial (QAR)
    RON => Romanian Leu (RON)
    RSD => Serbian Dinar (RSD)
    RUB => Russian Ruble (RUB)
    RWF => Rwandan Franc (RWF)
    SAR => Saudi Riyal (SAR)
    SBD => Solomon Islands Dollar (SBD)
    SCR => Seychellois Rupee (SCR)
    SDG => Sudanese Pound (SDG)
    SEK => Swedish Krona (SEK)
    SGD => Singapore Dollar (SGD)
    SHP => Saint Helena Pound (SHP)
    SLL => Sierra Leonean Leone (SLL)
    SOS => Somali Shilling (SOS)
    SRD => Surinamese Dollar (SRD)
    STD => São Tomé and Príncipe Dobra (STD)
    SVC => Salvadoran Colón (SVC)
    SYP => Syrian Pound (SYP)
    SZL => Swazi Lilangeni (SZL)
    THB => Thai Baht (฿)
    TJS => Tajikistani Somoni (TJS)
    TMT => Turkmenistani Manat (TMT)
    TND => Tunisian Dinar (TND)
    TOP => Tongan Paʻanga (TOP)
    TRY => Turkish Lira (TRY)
    TTD => Trinidad and Tobago Dollar (TTD)
    TWD => New Taiwan Dollar (NT$)
    TZS => Tanzanian Shilling (TZS)
    UAH => Ukrainian Hryvnia (UAH)
    UGX => Ugandan Shilling (UGX)
    USD => US Dollar ($)
    UYU => Uruguayan Peso (UYU)
    UZS => Uzbekistan Som (UZS)
    VEF => Venezuelan Bolívar (VEF)
    VND => Vietnamese Dong (₫)
    VUV => Vanuatu Vatu (VUV)
    WST => Samoan Tala (WST)
    XAF => CFA Franc BEAC (FCFA)
    XCD => East Caribbean Dollar (EC$)
    XDR => Special Drawing Rights (XDR)
    XOF => CFA Franc BCEAO (CFA)
    XPF => CFP Franc (CFPF)
    YER => Yemeni Rial (YER)
    ZAR => South African Rand (ZAR)
    ZMK => Zambian Kwacha (1968-2012) (ZMK)
    ZMW => Zambian Kwacha (ZMW)
    ZWL => Zimbabwean Dollar (2009) (ZWL