Explain the role of static variables in mysql in detail

Explain the role of static variables in mysql in detail

Use static variables static variable

Sample code:

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

This function is useless because it sets the value of $a to 0 and outputs "0" every time it is called. Adding 1 to the variable $a + + has no effect, because once 1 exits this function, the variable $a does not exist

Sample code:

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

Every time the Test () function is called, the value of $a is output and 1 is added; Static variables also provide a way to deal with recursive functions. A recursive function is a function that calls itself.

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