PHP - Math Errors And Problems

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?

is there a math function that give you an integer value when u divide 2 numbers?
ie in 7/3  i just want 2 as a result not floating number.
thanks in advance.

Hello Everyone,

I'm a newbie trying to improve my script below.
The script works fine but I would like to add the 3 radio buttons computations enhancements
Ergo,  if a user chooses 'Matte Paper" a 10% would be added to the Price Quote result.
If a user chooses ' Gloss Paper,  a 10% would be added to the Price Quote result.
If a user chooses 'Canvas" , a 20 % would be added to the Price Quote result.
If someone could assist with the math or post me a helpful link it would be greatly appreciated.
Thank you.

Paul from Melbourne, Australia.


<div style="border:dashed 1px; width:570px;">

<form method="post" action="<?php echo $_SERVER['php_SELF'];?>">

<p>
1. Enter the size (100w.x180h. cm) you want your picture printed:
Width
<input type="text" name="width" size="1"   maxlength="3"
value="0" onFocus="this.value=''; this.style.color='#ff0000';">
Height
<input type="text" name="height" size="1" value="0"  maxlength="3"
value="0" onFocus="this.value=''; this.style.color='#ff0000';">
</p>


<p>
2. Choose the printing material for your pictu
<input type="radio"  value="cms in Matte paper"  name="material" size="3"  maxlength="3" /> Matte Paper
<input type="radio"  value="cms in Gloss Paper:"  name="material" size="3"   maxlength="3" /> Gloss Paper
<input type="radio" value="cms in Canvas:"  name="material"  size="3"  maxlength="3" />  Canvas
</p>

<p>
3. Submit your info for our Price Quote below :
<input type="submit" name="submit" value="Submit" />
or:
<input type="submit" name="clear" value="Reset" />
</p>


<p>
5. Our Price Quote to print your artwork sized: 

<?php

$width = $_POST['width'];
/* if artwork wider than 101 cm no quote, exits*/
if ($width >=101)
{echo "Error!"; exit ;}

$height = $_POST['height'];
/* if artwork higher than 181 cm no quote, script exits */
if ($height >=181)
{echo "Error!"; exit ;}

$measurement = $_POST['measurement'];
$material = $_POST['material'];
$result = $width * $height;
echo "
$width
x
$height
$material
is: ";
echo "$".number_format($result,2). "" ;
?>
</p>

</form>
</div>

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);
        
        }
        
        ?>

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>

I'm using this code to get me the variables to a select box on a register page:
$vars['user-birthdate-years'] = array(_VARS_USER_CHOOSE_ => "Please choose", _VARS_USER_NONE_ => _VARS_USER_UNDEF_); for ($i = date('Y') - 18; $i > date('Y') - 75; --$i) { $vars['user-birthdate-years'][$i] = "$i"; }

This gives me this result in the page source:
<select name="birthyear" class="date"><option value="-2" selected="selected">Please choose</option><option value="1997">1997</option><option value="1996">1996</option><option value="1995">1995</option><option value="1994">1994</option><option value="1993">1993</option><option value="1992">1992</option><option value="1991">1991</option><option value="1990">1990</option><option value="1989">1989</option><option value="1988">1988</option><option value="1987">1987</option><option value="1986">1986</option><option value="1985">1985</option><option value="1982">1982</option><option value="1981">1981</option><option value="1980">1980</option><option value="1979">1979</option><option value="1978">1978</option><option value="1977">1977</option><option value="1976">1976</option><option value="1975">1975</option><option value="1974">1974</option><option value="1973">1973</option><option value="1972">1972</option><option value="1971">1971</option><option value="1970">1970</option><option value="1969">1969</option><option value="1968">1968</option><option value="1967">1967</option><option value="1966">1966</option><option value="1965">1965</option><option value="1964">1964</option><option value="1963">1963</option><option value="1962">1962</option><option value="1961">1961</option><option value="1960">1960</option><option value="1959">1959</option><option value="1958">1958</option><option value="1957">1957</option><option value="1956">1956</option><option value="1955">1955</option><option value="1954">1954</option><option value="1953">1953</option><option value="1952">1952</option><option value="1951">1951</option><option value="1950">1950</option><option value="1949">1949</option><option value="1948">1948</option><option value="1947">1947</option><option value="1946">1946</option><option value="1945">1945</option><option value="1944">1944</option><option value="1943">1943</option><option value="1942">1942</option><option value="1941">1941</option></select>

Problem: When running the php code at the top it miss two years in the span as you see in the page source below, the year 1983 and 1984 is completely missing in the page source. Why is this happening, could the php code be corrected or is there a workaround in php for the missing years bug I seem to have found?

I really appreciate any help on this!
Edited by Drezzzer, 12 January 2015 - 05:16 AM.

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 :\

Hi guys, I just decided to add an addition question in my site for submitting a form, not gonna say where coz one of you will most proberly try to prove it doesnt work! I have a feeling its easy enough for someone to send my form by getting the two variables and evaluating them. But how would they do that? and how would they know the names of the variables to send...?

Is there a way of doing a math captcha that cannot be hacked?

Hi guys!

Am trying to get hold of a PHP Math Expression Parser that follows correct precedence and executes custom functions. Can somebody share his scripts? or lead me to the right directions?

Hope you can help! Thanks a lot! My boss is gonna kill me soon. This is 1 week overdue already.

Jon

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

What is the correct way to right a simple maths question

i have my total as:
<?php echo $row['total'];?>

i have my another number as:
<?php echo $row['user_credit']; ?>

but what i want to do is subtract the user_credit from the total and save it as a new variable called 'credits_used' but im unsure how to write it

do i do it like
$row['total'] - $row['user_credit'] = $row['credit_used'];

Thank for any help

This topic has been moved to PHP Math Help.

http://www.phpfreaks.com/forums/index.php?topic=350528.0

Good day,  I have problem on subtracting time. Can anyone give me a hint how will I going to do that.     I already manage to get the SUM on time addition using this method. 

$data = array('1:52:37','9:56:39','08:04:22','05:32:20'); 

echo convertTime($data); - ANSWER 25:25:58    

function convertTime($data){
		$seconds = null;
		$minutes = null;
		$hours = null;
		foreach($data as $key => $value){
			$time1 = explode(':',$value);
			list($h[$key],$m[$key],$s[$key]) = $time1;	
			$seconds += $s[$key];
			$minutes += $m[$key];
			$hours += $h[$key];
		}
		
		$total_sec_min = intval($seconds / 60);
		$total_seconds = $seconds % 60;
		#$total_seconds;
		$total_minutes = $minutes % 60;
	   	
		if($total_sec_min > 0){
			$total_minutes = $total_minutes + $total_sec_min;
		}
		$total_min_hr = intval($minutes / 60);	
		$total_hours = $hours;
		if($total_min_hr > 0){
			$total_hours = $total_hours + $total_min_hr;
		}

		return $total_hours.':'.sprintf("%02s",$total_minutes).':'.sprintf("%02s",$total_seconds);
	}

But I really got hard time when it comes to subtraction. 

My code is

$answer = (1/212500);
output is

4.90205690308E-6

while I need I output as
0.00000470588

Please help, and tell me what is the specific problem,

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 =]