Get terminal notifications for litecoin changes

litecoin_kraken.php

<?php
                                                                                
error_reporting(0);                                                             
                                                                                
while (true) {                                                                  
     $ch = curl_init();                                                         
     curl_setopt($ch, CURLOPT_URL, 'https://api.kraken.com/0/public/Ticker?pair=LTCEUR');
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                            
     $content = curl_exec($ch);                                                 
     curl_close($ch);                                                           
                                                                                
     if ($content) {                                                            
        $result = json_decode($content, true);                                  
        $low = $result['result']['XLTCZEUR']['l'][0];                           
        $high = $result['result']['XLTCZEUR']['h'][0];                          
     }                                                                          
                                                                                
    exec('terminal-notifier -message "low: ' . $low . ' - high: ' . $high . '" -title "Kraken LTC"');
    sleep(3600 / 4);                                                            
}                                                                               

// https://api.kraken.com/0/public/Ticker?pair=LTCEUR