[SOLVED] some php maths stuff

[blueman378]

hi guys im making a simple rating system and i need a way to work out the percentage,

when a user votes

get what i mean?

and so the script will be something like

<?php
//Retrieve Vote
$vote = $_GET['vote'];
  //Retrieve current value
$game = $_GET['game'];
    global $database;
    $q = "SELECT * FROM " . Games . "
          WHERE gName = '$game'
          ORDER BY `gName` ASC
         ";   
    $result = $database->query($q) or die("Error: " . mysql_error());
    /* Error occurred, return given name by default */
    $num_rows = mysql_numrows($result);
    if( $num_rows == 0 ){
      return 'Game Not Found!';
    }
    while( $row = mysql_fetch_assoc($result) ) {
    $current = $row[RId];
    $votes = $row[Votes];
    }
//End current value
//What vote
if ($vote = down) {
        function down($current, $votes)
{
    $current--;
    $votes--;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
down()} elseif ($vote = up) {
    function up($current, $votes)
{
    $current++;
    $votes++;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
up()
} else {
    echo "Hmm... your vote wasnt cast for some reason";
}
?>

 

would this work?

[blueman378]

well acctually lets scrap the db stuff for now so use;

<?php
//Retrieve Vote
$vote = $_GET['vote'];
  //Retrieve current value
$game = $_GET['game'];
    global $database;
    $q = "SELECT * FROM " . Games . "
          WHERE gName = '$game'
          ORDER BY `gName` ASC
         ";   
    $result = $database->query($q) or die("Error: " . mysql_error());
    /* Error occurred, return given name by default */
    $num_rows = mysql_numrows($result);
    if( $num_rows == 0 ){
      return 'Game Not Found!';
    }
    while( $row = mysql_fetch_assoc($result) ) {
    $current = $row[RId];
    $votes = $row[Votes];
    }
//End current value
//What vote
if ($vote = down) {
        function down($current, $votes)
{
    $current--;
    $votes--;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
down()} elseif ($vote = up) {
    function up($current, $votes)
{
    $current++;
    $votes++;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
up()
} else {
    echo "Hmm... your vote wasnt cast for some reason";
}
?>

[blueman378]

hmm ok well using this:

<?php
//Retrieve Vote
$current = 5;
    $votes = 22;
$vote = $_GET['vote'];
  //Retrieve current value

//End current value
//What vote
if ($vote = down) {
        function down()
{
global $current;
global $votes;
    $current--;
    $votes--;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
down();
}  elseif ($vote = up) {
    function up()
{
global $current;
global $votes;
    $current++;
    $votes++;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
up();
} else {
    echo "Hmm... your vote wasnt cast for some reason";
}
?>

i get 19.0476190476

using url test.php?vote=up

and test.php?vote=down

and test.php

they all get the same result

[blueman378]

ok i got it working with:

<?php
//Retrieve Vote
$vote = $_GET['vote'];
$current = 5;
    $votes = 22;
function down()
{
global $current;
global $votes;
    $current--;
    $votes--;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}
function up()
{
global $current;
global $votes;
    $current++;
    $votes++;
    $new = $current/$votes;
    $new*=100;
    echo $new;
}


  //Retrieve current value

//End current value
//What vote
if ($vote==down) {
        down();
}  elseif ($vote==up) {
    up();
} else {
    echo "Hmm... your vote wasnt cast for some reason";
}
?>

but is there any way to round it to the closest whole number?

[codebyren]

Right, i'll be honest, I haven't read through your whole code yet cause you and yourself seem to be doing alright so far and posting faster than I can read.

 

Couldn't you use ceil() to round up a number to the next integer number...

 

http://au2.php.net/ceil

 

Sorry, I might be on the completely wrong track here but that's what i would do...

[blueman378]

ok thats good to hear,

i am not bothering with the rounding now,

but now i am trying to use this:

if ($new<=19.5) {
      ?><img src="star/1star.png" width="130" height="25"><?php
}  elseif ($new>=19.6&&$new>=39.5) { ?>
<img src="star/2star.png" width="130" height="25">
<?php }
elseif ($new>=39.6&&$new>=59.5) { ?>
<img src="star/3star.png" width="130" height="25">
<?php }
elseif ($new>=59.6&&$new>=79.5) { ?>
<img src="star/4star.png" width="130" height="25">
<?php }
elseif ($new>=79.6) { ?>
<img src="star/5star.png" width="130" height="25">
<?php }
else {
    echo "Hmm we have no vote...";
}

 

but no matter what $new equals it always shows as one star,

any ideas?