what is the static variable in function useful for, PHP Variables and Datatypes , PHP

Question:What is the static variable in function useful for?

Answer A static variable is defined within a function only the first time and its value can be modified during function calls as follows:
<?php 
function testFunction() { 
 static $testVariable = 1;
 echo $testVariable; 
 $testVariable++; 
} 
testFunction();        //1 
testFunction();        //2 
testFunction();        //3 
?>

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What is the static variable in function useful for?

Question:What is the static variable in function useful for?

Answer A static variable is defined within a function only the first time and its value can be modified during function calls as follows: <?php function testFunction() { static $testVariable = 1; echo $testVariable; $testVariable++; } testFunction(); //1 testFunction(); //2 testFunction(); //3 ?>