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What are scopes of variable in php?

How can we increase the speed of a MySQL select query?

How can we find the number of rows in a table using MySQL?

How to show data values on top of each bar in chart.js

List some of the most commonly used built-in modules in Python?

How is memory managed in Python?

Explain Global, Local and Nonlocal variables.

What's the use of a session framework?

How to set or get config variables in Codeigniter?