Sdk failed to debug on linux server


i have deployed the paynow php sdk on linux server but its showing me erro below

[Tue Jan 17 13:52:04.285016 2023] [php7:emerg] [pid 646528] [client 57628] PHP Parse error: Invalid numeric literal in /var/www/onlineapply/paynow1/paynow1/examples/mobile.php on line 25

but the same sdk is working fine on windows server so help me ASAP