Refactor the php code: 1. !==null -> isset() 2. == -> ===
Refactor the php code:
1. !==null -> isset()
2. == -> ===

enjine/resource-proxy,phpmaps/resource-proxy,jontwo/resource-proxy,Ricardh522/resource-proxy,guo7711/resource-proxy,bsvensson/resource-proxy,Esri/resource-proxy,jontwo/resource-proxy,Esri/resource-proxy,NoashX/resource-proxy,NoashX/resource-proxy,TheMushrr00m/resource-proxy,TheMushrr00m/resource-proxy,Ricardh522/resource-proxy,guo7711/resource-proxy,phpmaps/resource-proxy,bsvensson/resource-proxy