Foreach help PHP licencing system

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PHP

Hi there

i am currently trying to implement and play around with a licencing system with my php code and found a licence system on github

when i run the client side php code i get a foreach error on line 16 and was wondering if someone could tell me exactly where it is wrong please its probably something so simple but any help would be great

the code is

define( "LICENSE_KEY", "000-0000-0000-0000" );

if( !( ini_get(allow_url_fopen) ) ) exit('Configuration Error: allow_url_fopen must be enabled on your server for this script to work');
    
    define( "LICENSE_SERV", "https://licencing.domain.com/check.php?key=" );

    $LICENSE_SERV=LICENSE_SERV;
    $LICENSE_KEY=LICENSE_KEY;
    $licserv = "$LICENSE_SERV$LICENSE_KEY";
    $lines = @file($licserv);

    foreach($lines as $line){
    $license = htmlspecialchars($line);
    
    if ($license == "INVALID") { 
   exit("Invalid License Key"); 
   } 
   
}

foreach($lines as $line){ is where the apparent error is occurring

any help would be greatly appreciated

Thanks

Chris.

What I have tried:

multiple variations and also online google searches and tried fixing this my self