buyrun basitçe hazırladım çok iyi değil ama temel olarak işinizi görebilir.
Temel Kullanım
$kur_bilgileri['kur adı print_r ile görebilirsiniz ']['kur_alis'];
$kur_bilgileri['kur adı print_r ile görebilirsiniz ']['kur_satis'];

<?php
    header('Content-Type: text/html; charset=UTF-8');
    set_time_limit(0);
    ini_set("memory_limit","-1");
    setlocale(LC_MONETARY, 'tr_TR');
    $kur_bilgileri = array();
    $alis_kar = 0.010;
    $satis_kar = 0.010;
    //ALTIN VS
    $link = 'https://altin.in/';
    $content = get_web_page($link);
    preg_match_all("@<div class='kurlar bordernone'(.*?)</div>@si",$content,$kurlar);
    foreach($kurlar[0] as $kur){
        preg_match_all("@<li(.*?)</li>@si",$kur,$kur_data);
        $kur_bilgileri[iconv('ISO-8859-9','UTF-8',strip_tags($kur_data[0][0]))] = array(
            'kur_adi' => iconv('ISO-8859-9','UTF-8',strip_tags($kur_data[0][0])),
            'kur_alis' => number_format(strip_tags($kur_data[0][1]),4),
            'kur_satis' => number_format(strip_tags($kur_data[0][2]),4),
            'kur_alis_dusuk' => number_format(strip_tags($kur_data[0][1]) - $alis_kar,4),
            'kur_satis_yuksek' => number_format(strip_tags($kur_data[0][2]) + $satis_kar,4)
        );
    }


    //DÖVİZ
    $link = 'https://kur.altin.in/banka';
    $content = get_web_page($link);
    preg_match_all('@<div class="kurlar bordernone"(.*?)</div>@si',$content,$kurlar);
    foreach($kurlar[0] as $kur){
        preg_match_all("@<li(.*?)</li>@si",$kur,$kur_data);
        $kur_bilgileri[iconv('ISO-8859-9','UTF-8',strip_tags($kur_data[0][0]))] = array(
            'kur_adi' => iconv('ISO-8859-9','UTF-8',strip_tags($kur_data[0][0])),
            'kur_alis' => number_format(strip_tags($kur_data[0][1]),4),
            'kur_satis' => number_format(strip_tags($kur_data[0][2]),4),
            'kur_alis_dusuk' => number_format(strip_tags($kur_data[0][1]) - $alis_kar,4),
            'kur_satis_yuksek' => number_format(strip_tags($kur_data[0][2]) + $satis_kar,4)
        );
    }


    echo json_encode($kur_bilgileri);
print_r($kur_bilgileri);
    function get_web_page( $url ){
        $user_agent='Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0';
        $options = array(
            CURLOPT_CUSTOMREQUEST  =>"GET",        //set request type post or get
            CURLOPT_POST           =>false,        //set to GET
            CURLOPT_USERAGENT      => $user_agent, //set user agent
            CURLOPT_COOKIEFILE     =>"cookie.txt", //set cookie file
            CURLOPT_COOKIEJAR      =>"cookie.txt", //set cookie jar
            CURLOPT_RETURNTRANSFER => true,     // return web page
            CURLOPT_HEADER         => false,    // don't return headers
            CURLOPT_FOLLOWLOCATION => true,     // follow redirects
            CURLOPT_ENCODING       => "",       // handle all encodings
            CURLOPT_AUTOREFERER    => true,     // set referer on redirect
            CURLOPT_CONNECTTIMEOUT => 120,      // timeout on connect
            CURLOPT_TIMEOUT        => 120,      // timeout on response
            CURLOPT_MAXREDIRS      => 10,       // stop after 10 redirects
        );
        $ch      = curl_init( $url );
        curl_setopt_array( $ch, $options );
        $content = curl_exec( $ch );
        $err     = curl_errno( $ch );
        $errmsg  = curl_error( $ch );
        $header  = curl_getinfo( $ch );
        curl_close( $ch );
        return $content;
    }