如何开启PHP8的JIT提升运行速度

opcache.enable=1
opcache.enable_cli=1
opcache.memory_consumption=512
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
;opcache.jit=off   #注释掉此行
opcache.jit_buffer_size=100M #此处是设置开启JIT的核心

$time1=time();
echo "开始时间：".$time1."<br>";

function gogogo($time1){
    $r = 0;
    for ($c = 0; $c < 1000000000; $c++) {
         $r += $c;
    }

    $time2=time();
    echo "结束时间：".$time2."<br>";
    echo "时间差：".($time2-$time1)."<br>";
}
gogogo($time1);