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What is the difference between post and get in php?_Backend development
The difference between post and get in php is: 1. post is safer and sends a larger amount of data; 3. post can send more data types, while get can only send ASCII characters; 4. post is sent to the serverData, get is to get data from the server.5. Get will cache data, but post will not.
Recommended tutorial: python videoTutorial"
How does python find the average of a list?
The method of python function to calculate the average value of list:
Usage: mean(matrix, axis=0) where matrix is a matrix and axis is a parameter
Use xhprof analysis in php7_backend development
This is a pure document. If you need it in the future, you can find it at any time and use xhprof to analyze it, which is convenient for code testing and comparative analysis (supports php7).
Take m * n matrix as an example:
axis does not set a value, averages m*n numbers, and returns a real number
axis=0: compress rows, average each column, return a 1* n matrix
axis=1: compress columns, average each row, return m * 1 matrix
>>> import numpy as np
>>> num1 = np.array([[1,2,3],[2,3,4],[3,4,5],[4,5,6]])
>>> now2 = np.mat(num1)
>>> now2
matrix([[1, 2, 3],
[2, 3, 4],
[3, 4, 5],
[4, 5, 6]])
>>> np.mean(now2) # find the mean of all elements
3.5
>>> np.mean(now2,0) # Compress rows and average each column
matrix([[ 2.5, 3.5, 4.5]])
>>> np.mean(now2,1) # Compress columns and average each row
matrix([[ 2.],
[3.],
[ 4.],
[ 5.]])
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