Explanation of the role of static variables in mysql, and explanation of static variables in mysql

Explanation of the role of static variables in mysql, and explanation of static variables in mysql

Measure the test taker's knowledge about the role of static variables in mysql.

Use static variable

Sample Code:

Function Test () {$ a = 0; echo $ a; $ a ++ ;}

This function is useless, because every call will set the value of $ a to 0 and output "0 ". Adding $ a ++ to a variable does not work, because $ a does not exist once you exit this function.

Sample Code:

Function Test () {static $ a = 0; echo $ a; $ a ++ ;}

Every time you call the Test () function, $ a is output and 1 is added. Static variables also provide a method to process recursive functions. A recursive function is a function that calls itself.

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