Detailed explanation of the role of static variables in MySQL

Detailed explanation of the role of static variables in MySQL

Using static variables static variable

Sample code:

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

This function is not very useful because it sets the value of $a to 0 and prints "0" each time it is called. $a++, which increments the variable by one, has no effect, because once you exit the function, the variable $a no longer exists.

Sample code:

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

Each call to the Test() function will output the value of $a and increase it by 1; static variables also provide a way to handle recursive functions. A recursive function is a function that calls itself.

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