:sig
bool file_chmod(String path, u32 mode)

:params
path : file or directory to change
mode : permission bits, e.g. 0644 or 0600 (octal)
return value : true on success

:content
Sets a path's permission bits, like the shell `chmod`. Pass the mode as an octal literal such as `0600`.

:example
file_put_contents("/tmp/doc-chmod.txt", "secret");
print(file_chmod("/tmp/doc-chmod.txt", 0600) ? "mode set" : "failed", "\n");

:see
>sys
file_stat
file_put_contents