Recursion for a static variable

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The first half of the Echo $cont + +, I can understand why echo $count--he started from 10. Press Top to bottom, + +--not offset?

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Results: 012345678910987654321
The first half of the Echo $cont + +, I can understand why echo $count--he started from 10. Press Top to bottom, + +--not offset?

This is the stack's in-out order

If the function is called, the following is not executed until the end of the COUNT>10 function call.

The first 10 recursion is not performed echo $count--; because the recursive call has not ended. Until then, the recursion is $count == 10 no longer performed, so the recursive operation is completed one layer at a time.

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