Use Memcache or Redis to limit the maximum number of votes for a user or an IP user over a period of time

Enable each user to vote up to 5 times within 10 minutes of a site

function isfrequently ($key) {    $t = 60*10;    $n = 5;    $mem = new Memcache ();    $mem->connect (' 127.0.0.1 ', ' 11211 ');    if (! $mem) {        echo ' memcache connection failed! ';        Exit;    }    $val = Unserialize ($mem->get ($key));    $val = $val? $val: Array ();/    if (count ($val) >= 5 && time ()-$val [0]< $t) {//        echo ' 10 minutes maximum of 5 votes ';/    } else{//        if (count ($val) > 1) {//            array_shift ($val);//        }//        $val [] = time ();//        $mem Set ($key, serialize ($val), 0, $t);//        Echo ' voted successfully! ';//    }    if (count ($val) < 5 | | $b = array_shift ($val) <time ()-$t) {        $val [] = time ();        $mem->set ($key, Serialize ($val), 0, $t);        Echo ' voted successfully! ';    } else{        Echo ' votes up to 5 times within 10 minutes ';    }

Note: $b = Array_shift ($val) <time ()-The operator priority in the $t is-above <,< above =. So the right side is less than set up, $b = 1, otherwise $b=0.

Start writing the comment section code, and then optimize it to | | Learn more in depth. When NULL is compared to a number, the default is 0.

Use Memcache or Redis to limit the maximum number of votes for a user or an IP user over a period of time