About $ _ SERVER ['argv'] Parameter

$ Aintval ($ _ SERVER [& #039; argv & #039;] [2]); $ _ SERVER [& #039; argv & #039;] [2] Why is it next to this place [2]? $ a = intval ($ _ SERVER ['argv'] [2]);

$ _ SERVER ['argv'] [2] Why is it followed by [2 ]?

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$ A = intval ($ _ SERVER ['argv'] [2]);

$ _ SERVER ['argv'] [2] Why is it followed by [2 ]?

PHP creates two special variables based on the parameters when the script is running. $ argc is an integer representing the number of parameters, and $ argv is an array variable containing the values of each parameter, its first element is always the name of the PHP script. The third parameter you pass to the script is$ _ SERVER ['argv'] [2]

The $ _ SERVER ['argv'] is an array.
[2] is the element subscript of the array.