/testfor command to count players? [duplicate]

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How do I use the Testfor player command?

How to Enter the Command

Test if Players are within 10 blocks. In this example, we will test to see if there are any players within a 10 block radius with the following command: /testfor @a[r=10] ...

Test if Mooshrooms are within 50 blocks. ...

Test if Nearest Player is at Level 20 experience.

What replaced the Testfor command?

The /testfor command became obsolete in Minecraft 1.13, and has been replaced by the /execute command*. It will do the same as typing /testfor @e {SelectedItem:{id:"<item>"}} and then putting a comparator to the command block with the command, and then running the command which you wanna run.

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Minecraft Redstone Tutorial | How to use testfor commands in MCPE!

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