How to input a username in url?

[MrSamCraft]

Hello,

 

I am wanting users on my site to enter their Minecraft account name that will then place their  player head as the profile image, i have the code to fetch it but how can I use php to input the username into the url?

 

<img src="https://minotar.net/avatar/USERNAME_here/100">

 

Thanks,

 Sam

[requinix]

echo '';