After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：PHP features
// # /* */都是注释符
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Courses in the relevant section：Variables in PHP
可变变量 可以在开头连续使用多个$符号 实际中只使用2个$ 从右向左解析$ 用得很少
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Courses in the relevant section：Multiple branch format switch
switch
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