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PHP is server based scripting language. All script tasks are performed on the server and you only see the output of it. One script often calls (echoes) another so you pretty much have to upload it on the server to see the changes you have done. I'm not sure how other programmers do it or whether there is a way to see your scripts perform without uploading them on a server, but this is the way I've been doing it all the time.
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