How can PHP help online business?

I am going to start my online business. Is helpful for my online business? Can anybody tell me about php.

If you have your own business (like a shop or something) you dont even need to know what is PHP.
If you have your own business is about web, than PHP may be helpful.
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Online advertising is so flexible that even small businesses can afford to look into it. Where else can you track leads per advertising keyword? Where else can you track the cost per lead? Where else can you track the dollar cost per sale? Only online advertising allows you to select the keywords for your online advertising campaign and track the effectiveness of each and every keyword in terms of sales and revenues.