In general, from my experience, i would say that if you are familiar only 1 language, your salary will be lower. Business need problem-solving, and usually you need to solve problems using different technologies.
This is not applicable for JS, since there are a lot of different options to use.
Initially this article suppose to show, that PHP its just the same tool as any other Programming langue, its not meant to say - go learn it.
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In general, from my experience, i would say that if you are familiar only 1 language, your salary will be lower. Business need problem-solving, and usually you need to solve problems using different technologies.
This is not applicable for JS, since there are a lot of different options to use.
Initially this article suppose to show, that PHP its just the same tool as any other Programming langue, its not meant to say - go learn it.