PHP - Math Time Subtractions

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.

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

 

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 />

   

Please deal with me for a moment as I try to explain what is occurring. 

I have created drop down menu that you choose a name and the php/MySQL will run multiple queries to display information regarding the chosen name. 
The query works great.  There is no problem with the query.

However when you leave the page, either by navigation or by X'ing out.  When you return there are two errors that pop up:

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in

You can then use the drop down menu and choose a name and it all works great.

It is my belief that these errors occur due to how the query was written, as the two queries that have these errors both have math in them.

My question is, how do I block these errors from occurring when you return to the page?

Here is the query:

<?php
//Worst Regular Season Record

include_once('../other/functions.php');
       
$con = mysql_connect($hostname, $username, $password)
    OR DIE ('Unable to connect to database! Please try again later.');
    $db = mysql_select_db($dbname, $con);

$query = "SELECT win, loss, year, teamname FROM standings, owners WHERE owners.owner_id =
standings.owner_id AND win = (SELECT MIN(win) FROM standings) AND standings.owner_id = $thing ORDER
BY year";
$result = mysql_query($query);
$row = mysql_fetch_array($result);

@ mysql_data_seek($result, 0);

if(mysql_num_rows($result)>0) {

echo "<table CELLPADDING=5 border =1>";
echo "<tr>";
echo "<th align=center colspan=4 > Worst Regular Season Record </th>";
echo "</tr>";

while ($row = mysql_fetch_array($result)) {
echo "<tr>";
echo '<td align=center> In '.$row['year'].', the '.$row['teamname'].' had '.$row['win'].' wins, and '.$row['loss'].' losses.</td>';
echo "</tr>";
}
} else {

}
echo "</table>";

mysql_close($con);
?>

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);
        
        }
        
        ?>

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

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?

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.

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=357542.0

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

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?

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>

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,

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 :\