以后想搞PHP，现在正在学html、css、javascript。
请问下要学PHP得话还要学会什么技术?
css要学到什么程度呢（精通还是能看懂代码CSS代码就行了）？
PHP工作内容有什么呢？是不是都是干二次开发的？
PHP是不是基本是在linux系统上运行的？
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