test1.php
<?php
$a = 5;
function test() {
static $a = 0;
return ++$a;
}
echo test();
echo test();
echo test();
exit;
结果：123
test2.php
<?php
$a = 5;
function test() {
$a = 0;
return ++$a;
}
echo test();
echo test();
echo test();
exit;
结果：111
