What Technologies Should a Senior PHP Web Developer Know?

Ramy Wafaa Illustration

I loosely follow various topics on Quora.com. Unlike many social media sites, I find that most of the answers to serious questions are respectful, well though-out, and cite references. Most of the questions I follow and answer are related to icon design or web development. I admit to occasionally getting sucked into a debate on religion or politics, but most of the time I successfully avoid these. A recent question piqued my interest. The question was, “What do I need to learn to build a site like Alibaba”?

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