PHP - Dates And Some Math

Hi guys.   I'm using php to randomly generate a simple math verification question.  But, I'm having a hard time validating the input.  Can someone please tell me what I'm doing wrong?

Thank you
 


} else if(trim($verify) != $_SESSION['UserData']['Math'][0]+$_SESSION['UserData']['Math'][1]){
     $error = '<div class="error_message">Attention! The verification number you entered is incorrect.</div>';
}



<?php
echo "<span class='label'><span class='required'>*</span>What is ".$_SESSION['UserData']['Math'][0]." +    ".$_SESSION['UserData']['Math'][1]."?</span> ";
?>

<input name="verify" type="text" id="verify" size="3" value="<?=$verify;?>" /><br /><br />

   

Hi, I am TheMeq. I am currently developing a Text-Based MMORPG in PHP/MySQL. I have quite alot of the code laid down, its just this bit that is starting to throw me a bit. I've been working on it since 8am this morning.. it is now 4:30pm and i think it's nearly there. It's just not working the way I would like.

So if I was to ask for help, should I just post what code I have?

I am trying to create a math equation inside a variable but I am struggling to achieve the desired result.

On one php page I have this:

 $x = "date('Y')";
 $y = "1989";
 $description = "In this classic lecture which was delivered over $x - $y years ago, etc etc.....";

On my main page I have linked to the above and also $description but the result I am getting is:

In this classic lecture which was delivered over date('Y') - 1989 years ago,

 

I want to create a variable so I don't need to go back every year and change the description. Is this possible?

Robert

 

Website: http://novacms.vacau.com/index.php

I'm trying to make a calculator for this game I play, it's fully developed, but with one bug. It doesn't do the math right.

$goal = The amount of EXP (Experience Points) someone wants to get
$exp = The amount of EXP they currently have
$npcs_exp["exp"] = The amount of EXP the monster has

But, when they enter in the information, the calculation is all screwed up. When I do it, it seems to give me the same number EACH time.

The part where the calculation "goes down". Remember, I'm trying to see how many times you need to kill a NPC to achieve your goal.


//math
$npc_exp_extract = mysql_query("SELECT exp FROM npcs WHERE name='$npc'");
$npcs_exp = mysql_fetch_assoc($npc_exp_extract);

$amount = $goal / $npcs_exp["exp"];


Full code:


<?php
$exp = $_POST["exp"];
$npc = $_POST["npc"];
$goal = $_POST["goal"];

mysql_connect("removed", "removed", "removed");
mysql_select_db("a2248602_npcs");

if(!$goal || !$npc || !$exp)
{
echo "<center><form action='index.php' method='POST'>GOAL: <input type='text' name='goal'> Current XP: <input type='text' name='exp'>";
echo "NPC: <select name='npc'>";

$npc_extract = mysql_query("SELECT * FROM npcs");
while($npcs = mysql_fetch_assoc($npc_extract))
{
 echo "<option name='". $npcs['name'] ."'>". $npcs['name'] ."</option>";
}

echo "</select> <input type='submit'></form></center>";
}
else
{
//math
$npc_exp_extract = mysql_query("SELECT exp FROM npcs WHERE name='$npc'");
$npcs_exp = mysql_fetch_assoc($npc_exp_extract);

$amount = $goal / $npcs_exp["exp"];

if($amount=="1")
{
echo "You will need to kill a <b/>". $npc ."</b> <b>". $amount ."</b> more time. You earn ". $npcs_exp["exp"] ." XP for each kill from this NPC. | <a href='index.php'>Do another</a><br/><br/>";
}
else
{
echo "You will need to kill a <b/>". $npc ."</b> <b>". $amount ."</b> more times. You earn ". $npcs_exp["exp"] ." XP for each kill from this NPC. | <a href='index.php'>Do another</a><br/><br/>";
}
}

echo "<center>Made by Zaros from <a href='creation-x.net'>Creation-X</a></center>";
?>


Mod edit: DB credentials removed.

I can' t even get the simple str_replace to work. I got....

$rslt = $client->getTodaySubIDStats($key, $sub_id);

$rslt = str_replace("EARNINGS",'',$rslt);
$rslt = str_replace("Array","",$rslt);
$rslt = str_replace("\r","",$rslt);
$rslt = str_replace("\n","",$rslt);
$rslt = str_replace("\t","",$rslt);

print_r($rslt);

which spits out....

Code: [Select]
Array
(
    [0] => Array
        (
            [EARNINGS] => $100.40
            [CLICKS] => 1301
            [LEADS] => 100
            [SUB_ID] => yacker
            [EPC] => $0.11
        )

)
I would like to have every thing removed except the '$100.40' (The number is always changing). Then remove the $ and do math 100.40*.40, so in the end, all it spits out is 40.16 and always only have two digits after the period.

This topic has been moved to PHP Math Help.

http://www.phpfreaks.com/forums/index.php?topic=310665.0

With this code, I am trying to create a guessing game. When I press the START button, I want it display a guess, highest, and the lowest number between 1-100. The highest number being 100, and the lowest being 1. I'm trying to get the math formula to do this equation (Guess = round((Highest +Lowest))/2. Can any one give me a hand.


Code: [Select]
<head>
<title>
Project 3
</title>
</head>
 
<body>
 
<h1>Guessing Game</h1>
<form method='post' action=''> <input type='submit' name='start' id='start' value='Start Game'>
<form method='post' action=''> <input type='submit' name='higher' id='higher' value='Higher'>
<form method='post' action=''> <input type='submit' name='lower' id='lower' value='Lower'>
<?php
if (isset($_POST['start'])) {






print"<input type = 'hidden' name = 'hdnCount' value = '$count'> 
<input type = 'hidden' name = 'hdntop' value = '$top'>
<input type = 'hidden' name = 'hdnbottom' value = '$bottom'>
<input type = 'hidden' name = 'hdnguess' value = '$guess'>";
}





if (isset($_POST['higher'])) { 

$count = $_REQUEST["hdnCount"];
$top = $_REQUEST["hdntop"];
$bottom = $_REQUEST["hdnbottom"];
$guess = $_REQUEST["hdnguess"];





print" <input type = 'hidden' name = 'hdnCount' value = '$count'> 
<input type = 'hidden' name = 'hdntop' value = '$top'>
<input type = 'hidden' name = 'hdnbottom' value = '$bottom'>
<input type = 'hidden' name = 'hdnguess' value = '$guess'>";


}



if (isset($_POST['lower'])) { 

$count = $_REQUEST["hdnCount"];
$top = $_REQUEST["hdntop"];
$bottom = $_REQUEST["hdnbottom"];
$guess = $_REQUEST["hdnguess"];





print" <input type = 'hidden' name = 'hdnCount' value = '$count'> 
<input type = 'hidden' name = 'hdntop' value = '$top'>
<input type = 'hidden' name = 'hdnbottom' value = '$bottom'>
<input type = 'hidden' name = 'hdnguess' value = '$guess'>";



}



?>


</form>
</body>
</html>

This topic has been moved to PHP Math Help.

http://www.phpfreaks.com/forums/index.php?topic=357542.0

question here...

say we have a string coming from a form, already verified that its numeric/mathmatical(+-*/) how can we then process that into an answer without using eval?

Code: [Select]
$string='1+2*3';
echo process($string); #7

Quote

If eval() is the answer, you're almost certainly asking the wrong question. -- Rasmus Lerdorf, BDFL of PHP

The title may not fit but only thing i could think of.

I am pulling data from MSSQL database table.... I need everything from that table but i need to do some basic math funcitons to the resulting data.

So the quesiton is should i do the math for this in the SQL query if so how do i pull all fields and do the math in an effcient way.

Or should i let php do the math for me after i get all the data i need. 

If it is better to use php how can i do this in a while loop and get the math result and not a printed equation.

Just looking for a few pointers never had to do math before with php

Having to go into somebody else's code yet again! Gah! Originally the totaling page just subtracted a flat discount. But now the client wants to be able to subtract percentage discounts and 'per item' discounts. In the discount table I added a field to determine whether the discount chosen is to be applied as flat off total, flat per item, % off total, and % off each item. I also entered a field that can have a class id, in case this discount is only for that class. (the intention being that otherwise the discount is on anything)

I've got a session variable that generates something like : Array ( [217] => 1 [215] => 2 )
meaning 1 person in class #217, and 2 people in class 215.

$_SESSION['s_to_be_added'] = array_filter($_POST['participantqty']);

Then on the page I'm concerned with, I've been trying to write the script. I know I still need some math stuff figured out
 But how do I take the array, do the math, and then generate an overall cost for the whole thing? and this is just  the discounting? I don't even have a clue how to work in delimiting it if there's a class id.. did any of that make sense?

Code: [Select]
<?php

// the above is the array I want to use to 
$passed_array = array_filter($_SESSION['s_to_be_added']);

// this is the discount 'code' the user entered.
$discount = mysql_escape_string($_POST['discount']);

// just a donation added after everything.
$donation = mysql_escape_string($_POST['donation']);

// finding the discount that matches the discount 'code' entered.
$query_selectAllItems_events = "SELECT discount_amount,discount_type,workshop_link_1 FROM tbl_discount where discount_value = '$discount'";

    $result_all_events = mysql_query($query_selectAllItems_events);
$numRows_all_events = mysql_num_rows($result_all_events);
$num=mysql_num_rows($result_all_events); 
$z_row = mysql_fetch_array($result_all_events);
        
        // this is just a number: 1, 20, 90 etc.
        $discount_amount = $z_row['discount_amount'];
        
        /*this is 1,2,3,4 - for each type of discount 1- flat 2- flat per item
        3- discount on all, 4- discount per item */
        $discount_type = $z_row['discount_type'];
        
        // the workshop id if the discount is onlyh for this workshop
        $discount_link_1 = $z_row['workshop_link_1'];
        
        // just a description
$discount_name = $z_row['discount_name'];

        
if ($discount_type ==1) {
            /* flat discount on total here */
            $total = mysql_escape_string($_POST['total']);

$final_total = ($total - $discount_amount);
$final_total = ($final_total + $donation);
        }
        
        elseif ($discount_type ==2)) {
            /*  discount per item total here */
$total = mysql_escape_string($_POST['total']);

$final_total = ($total - $discount_amount);
$final_total = ($final_total + $donation);
        
        }
        
        elseif ($discount_type ==3)) {
            /* percentage discount on total here */
$total = mysql_escape_string($_POST['total']);

$final_total = ($total * ($discount_amount/100));
$final_total = ($final_total + $donation);
        
        }
        
        elseif ($discount_type ==4)) {
            /* percentage discount per item here */
$total = mysql_escape_string($_POST['total']);

$final_total = ($total * ($discount_amount/100));
$final_total = ($final_total + $donation);
        
        }
        
        ?>

I can not seem to figure out how to do this..

I just need to add 100+99+98+97+96...+1 

no you can not do 100! because that multiples them =]

Code: [Select]
if ($user['amount'] >= 15.00){
   $user['max_stars'] = 3;
}
Ok and

Code: [Select]
if ($user['amount'] >= 20.00){
   $user['max_stars'] = 4;
}How can I write a function that will loop through the 15,20,25,30,35, all the way up to 600$ or if the max_Stars get's up to 80?

I really don't want to have 80 if functions in my code :\

I am doing some simple math and it is spitting out very odd results.

//First Loop to get the values
$get_values = mysql_query("SELECT * FROM table");
while($values = mysql_fetch_array)){
$value_one += $values[value_one];
$value_two += $values[value_two];
}
$difference = $value_one - $value_two;
echo"$value_one - $value_two = $difference;

The database field types are DECIMAL(10,2). The output of the individual values is echoing the correct 0.00 format but after it loops for awhile the difference seems to come out differently. and have close to 5 or 6 places after the decimal. if i echo the values as it is looping and adding them it seems to not be adding correctly either. What am I doing wrong?

Hey.   So imagine this example...  

class FormulaEvaluator {
...... //Construct & variables here..
 
public function exec() {
//Missing some lines here, but you get the idea
$formula = $this->formula;
$context = (array) $this;
ob_start();
$res = eval('return ' . $formula . ';');
}
}
 
$formulaEvaluator = new FormulaEvaluator();
$formula = '10 * (($Test * 2) + ($Test2 / 3))';
$formulaEvaluator->formula = $formula;
$formulaEvaluator->Test = 20000;
$formulaEvaluator->Test2 = 300000;
$res = $formulaEvaluator->exec();
echo $res; //1400000

  The code we have is working as intended, but we want to avoid using eval. I know it's a pretty common question, and the answer is usually the same, but is there any way to do something similar without using eval?