​x
 
<!DOCTYPE html>
<html>
<body>
​
<?php
function myTest() {
   static $x=0;
   echo $x;
   $x++;
}
​
myTest();
echo "<br>";
myTest();
echo "<br>";
myTest();
echo "<br>";
myTest();
echo "<br>";
myTest();
?>  
​
</body>
</html>
​