I'm fairly new to PHP and I've been exploring different ways to establish network connections within my applications. I recently came across the `pfsockopen()` function in PHP, but I'm still a bit confused about its usage and how it differs from other network functions.
Can someone please explain to me how the `pfsockopen()` function works and provide a clear example that demonstrates its usage? I would also appreciate it if you could explain when it's most appropriate to use this function instead of other network functions in PHP.
Thank you in advance for your help!