I need to add some numbers together that are being pulled from a MySQL table to get a total value.
Currently the issue I have is the numbers being added to the end of a string instead.
e.g:
1,2,3,4 becomes 1234 instead of 10
Here is what I am using to get the numbers from the database:
$count = mysqli_query($connect, "SELECT QUANTITY FROM Table");
while($row = mysqli_fetch_assoc($count)) {
$total .= $row['Quantity'];
//I Have also tried
$total .= (int)$row['Quantity'];
}
echo $total;
The Quantity Column is set to be an INT in the table so I would have expected it to add together automatically. What am I doing wrong?
You should probably look at the difference between .= and +=
By adding a . in front of = you concatenate - You add the value ad the end of the variable.
If you would use a + in front of your = you would actually get the result you want.
$count = mysqli_query($connect, "SELECT QUANTITY FROM Table");
$total = 0;
while($row = mysqli_fetch_assoc($count)) {
$total += $row['Quantity'];
}
echo $total;
http://php.net/manual/en/language.operators.string.php
Related
i want to show Random Item with Select by WHERE code = $Code
But if he finds like 10 Items, i want to show only 1 by 1. All 10 must show in a Row, Random Order with a 5 seconds timer. The Problem is, i dont will show the same Item again and again. If the 10 Items are done, he must look again to database and start again
I already tried to do it with putting all in array but my skills are low :(
Thats my try...
$result = $db->query( 'SELECT * FROM ads WHERE zipcode = "'.$zipcode.'";');
while($row = $result->fetch_assoc()) {
$data[] = $row;
}
$count = mysqli_num_rows($result);
for($i = 0; $i < $count; $i++) {
$random = rand(0, $count);
$count -= 1;
$result[] = $data[$random];
echo json_encode($data);
unset($data[$random]);
}
Good Day, I am working on some scoring system that would display all the scores by all of the users and would sum it up using PHP from MySQL. The result is working fine and the computation as well (the computation is done with php, not on MySQL). Now my problem is, how can I rank the total scores from highest to lowest.
Here's the code:
$sel_query="Select * from tbl_scores";
$result = mysql_query($sel_query);
while($row = mysql_fetch_array($result)) {
$crit_3 = $row["crit_3"];
$crit_3a = number_format($crit_3);
$crit2_3 = $row["crit2_3"];
$crit2_3a = number_format($crit2_3);
$crit3_3 = $row["crit3_3"];
$crit3_3a = number_format($crit3_3);
$user1 = ($crit_3) ;
$user2 = ($crit2_3);
$user3 = ($crit3_3);
$divide = ($user1 + $user2 + $user3);
$total = number_format($divide / 9 , 2, '.', '');
$average = number_format($total * 0.15 , 2, '.', '');
?>
Thanks in advance.
1.Please stop using (deprecated from php5.5 +removed from php7) mysql_*,use mysqli_* OR PDO.
2.Define an array variable outside of the loop, and inside in the loop assign total scores to that array.
3.Now you will get an array of scores and now you can use rshort() method to get data correctly.
So the code should be like below:-
$sel_query="Select * from tbl_scores";
$result = mysql_query($sel_query);
$scores_array = array();//create an array
while($row = mysql_fetch_array($result)) {
$crit_3 = $row["crit_3"];
$crit_3a = number_format($crit_3);
$crit2_3 = $row["crit2_3"];
$crit2_3a = number_format($crit2_3);
$crit3_3 = $row["crit3_3"];
$crit3_3a = number_format($crit3_3);
$user1 = ($crit_3) ;
$user2 = ($crit2_3);
$user3 = ($crit3_3);
$divide = ($user1 + $user2 + $user3);
$total = number_format($divide / 9 , 2, '.', '');
$average = number_format($total * 0.15 , 2, '.', '');
$scores_array[$row['user_name']] = $total; // assign total to the array and i assume that your table has one column name user_name for each user, change accordingly
}
rsort($scores_array);// sort the array in decending order of total scores
foreach ($scores_array as $key=>$value){ // iterate through array
echo $key.'has scored total score:-'.$value; //print the score along with username
}
?>
Note:- Please take the variable names in such a way that they will not produce any ambiguity.
I have this for loop that generates 10 results:
<?php
include "dbconnect.php";
$table = "SELECT id FROM players ORDER BY RAND()* ( 1 / percentage)";
for ($i = 0; $i < 10; $i++){
$result[0] = mysql_fetch_array(mysql_query($table));
foreach ($result as $winner){
echo $winner[0] . " ";
}
}
?>
It generates a result like:
10 10 11 9 13 11 10 12 8 12
My question is how do I count the generation? For the above example it would be:
8's = 1, 9's = 1, 10's = 3, 11's = 2, 12's = 2, 13's = 1.
I basically want to count the amount of specific results generated. Sorry if i'm not making much sense.
You need to get off of MySQL functions and check out PDO or MySQLI at a minimum. But for the meat of the question:
Don't run a query, full or limited in the loop
Look at the LIMIT clause in the query
array_count_values will count the values. You can loop it and echo or whatever
Example:
$table = "SELECT id FROM players ORDER BY RAND()*(1/percentage) LIMIT 10";
$result = mysql_query($table);
while($row = mysql_fetch_array($result)) {
$winner[] = $row[0];
}
echo implode(' ', $winner);
foreach(array_count_values($winner) as $number => $count) {
$output = "$number's = $count";
}
echo implode(', ', $output);
You're existing code to make the random choice work would look like (LIMIT 1):
$table = "SELECT id FROM players ORDER BY RAND()*(1/percentage) LIMIT 1";
for($i = 0; $i < 10; $i++){
$result = mysql_fetch_array(mysql_query($table));
$winner[] = $row[0];
}
echo implode(' ', $winner);
if you check the php manual:
http://php.net/manual/en/function.mysql-query.php
then try something like this:
while ($row = mysql_fetch_assoc($table)) {
echo $row['column_name'];
echo $row['column_name'];
//.. you get the idea
}
The id is usually the first column in a database table. This is why you are just getting the id. You need to access each row in the same way you access arrays.
I should point out that the mysql library is deprecated. So you should consider using something like PDO instead.
I have a question that pertains to gathering events from tables in a calendar program where they are separated into "events" or "repeated events". I can get all individual events perfectly well now (thanks to Chris on this site), but if they are repeating events I have to calculate it from what is given in this particular db. If I change the types or the data in the db, it will probably trash the calendar so I have to use what I have.
The variables I have sorted out so far are:
$quid2 = The IDs for today's events that are classified as repeating events (needed earlier)
$quname = The repeated event names
$qucls = The date UNIX time for the last sent reminder of events dated today
$qutype = One of these words - daily, weekly, monthly or yearly
$qudesc = A description of the event
These variables all have the same number of items and are ordered correctly between each other. (I Hope)
Below is the logic I am trying to accomplish. It are most assuredly not proper syntax but I think it is understandable; I need to figure out what the syntax and form is. I am utterly and completely new at this... so please be gentle...
It needs to be put in an array (I think)
$arr1 = some type of array($quname, $qucls, $qutype, $qudesc)
update the array...
IF $qutype($row2) = "daily", then + 1440 to it's $qucls($row[1])
IF $qutype($row2) = "weekly", then + 10080 to it's $qucls($row[1])
IF $qutype($row2) = "monthly, then + 1 month to it's $qucls($row[1])
IF $qutype($row2) = "yearly", then + 1 year to it's $qucls($row[1])
Then final product...
while ($row = mysql_fetch_array($arr1, MYSQL_NUM)) {
$UxTime = $row[1];
date_default_timezone_set('America/Denver');
$Time = date("H:i", $UxTime);
$qufinal = sprintf("Event: %s \nTime: %s \nDesc: %s \n\n", $row[0], $Time, $row[3);
}
...
This is a big learning project for me. I don't know enough PHP and mysql to make this work but I know just enough to get me in trouble. Thanks!
EDIT: adding the queries from which I made these variables:
$today = date("Ymd");
mysql_select_db($dbname);
$query1 = "SELECT cal_id, cal_name, cal_date, cal_time, cal_type, cal_description FROM webcal_entry WHERE cal_type = "M" AND cal_date != " . $today;
$wequ1 = mysql_query($query1)
while ($row = mysql_fetch_array($wequ1, MYSQL_NUM)) {
$quid1 = $row[0], $quname = $row[1], $qutime = $row[2], $qudesc = $row[3];
}
$query2 = "SELECT cal_id, cal_type, cal_ByDay FROM webcal_entry_repeats WHERE cal_id = " . $quid1;
$wer1 = mysql_query($query2)
while ($row = mysql_fetch_array($wer1, MYSQL_NUM)) {
$quid2 = $row[0] $qutype = $row[1], $qubdy = $row[2];
}
$query3 = "SELECT cal_id, cal_last_sent FROM webcal_reminders WHERE cal_id = " . $quid2;
$wer2 = mysql_query($query3)
while ($row = mysql_fetch_array($wer2, MYSQL_NUM)) {
$qucls = $row[1];
}
The syntax for arrays is as follows:
$arrayName = array($quname, $qucls, $qutype, $qudesc);
Then you can access the values by their index on the array variable:
$arrayName[0] == $quname
$arrayName[1] == $qucls
...
You can also define it as associative array:
$arrayName = array(
"quname" => $quname,
"qucls" => $qucls,
"qutype" => $qutype,
"qudesc" => $qudesc
);
Using this syntax you can access the elements by their name:
$arrayName["quname"] == $quname
$arrayName["qucls"] == $qucls
...
More reading on this: Arrays
However, you don't really need an array for what you plan to do here. Arrays are very useful if you want to store data that is structurally equal. This applies e.g. to rows in a database: They always have the same number of entries, and the columns are of the same type.
If you have just one dataset at that point of code (one event in this case), then you need no array. Of course you have several events, but as they are processed in a loop (I assume) you handle only one event at a time, and then head to the next.
So, you want to modify a variable depending on the value $qutype. To do that, you can use a switch statement:
$dateObj = date_create("#$qucls");
switch($qutype) {
case "daily":
date_add($dateObj, date_interval_create_from_date_string("1 day"));
break;
case "weekly":
date_add($dateObj, date_interval_create_from_date_string("1 week"));
break;
case "monthly":
date_add($dateObj, date_interval_create_from_date_string("1 month"));
break;
case "yearly":
date_add($dateObj, date_interval_create_from_date_string("1 year"));
break;
}
$qucls = date_format($dateObj, "U");
I don't add the number of seconds, because that would work for days and weeks- but not for months and years, as they don't have a fixed number of seconds.
If you have questions about the functions I used above you can look up their documentation on php.net.
In the code you show you must not use mysql_fetch_array.
That function is only meant for result rows you got from a call to mysql_query, but not for normal arrays.
You don't need the while loop either. All you have to do is formatting $qucls to a readable format and produce the final string:
date_default_timezone_set('America/Denver');
$Time = date("H:i", $qucls);
$qufinal = sprintf("Event: %s \nTime: %s \nDesc: %s \n\n", $quname, $Time, $qudesc);
Edit:
Like discussed in the comments here is the revised and commented code you edited in:
$today = date("Ymd");
mysql_select_db($dbname);
// You need to use single quotes at the 'M'. Using double quotes will
// end the string and thus leading to incorrect syntax
$query1 = "SELECT cal_id, cal_name, cal_date, cal_time, cal_type, cal_description FROM webcal_entry WHERE cal_type = 'M' AND cal_date != " . $today;
$wequ1 = mysql_query($query1);
// This is a counter variable which is incremented in the loop
$i = 0;
// This is the outer while loop used to gather and store the events
while ($row = mysql_fetch_array($wequ1, MYSQL_NUM)) {
// Store the results in arrays
// Statements must be seperated by a ;
$quid1[$i] = $row[0];
$quname[$i] = $row[1];
$qutime[$i] = $row[2];
$qudesc[$i] = $row[3];
$query2 = "SELECT cal_id, cal_type, cal_ByDay FROM webcal_entry_repeats WHERE cal_id = " . $quid1[$i];
$wer1 = mysql_query($query2);
// Assuming that IDs are unique this query can only return one entry. Therefore no while is
// needed, but an if statement tests if the ID actually matched a result
if ($row = mysql_fetch_array($wer1, MYSQL_NUM)) {
//$quid2[$i] = $row[0]; <- the query above ensures that $quid1[$i] == $quid2[$i]. No need to store it again
$qutype[$i] = $row[1];
$qubdy[$i] = $row[2];
}
$query3 = "SELECT cal_id, cal_last_sent FROM webcal_reminders WHERE cal_id = " . $quid1[$i];
$wer2 = mysql_query($query3);
// Same as above; If the IDs are unique then you need no loop
if ($row = mysql_fetch_array($wer2, MYSQL_NUM)) {
// The $i++ used here is the short form. As this is the last time $i is
// used in the loop it needs to be increased before the next round. You can do
// this like this or in an extra statement. This way it's evaluated and then increased
$qucls[$i++] = $row[1];
}
// End outer while loop
}
// Now go through the results. $i holds the number of entries in the arrays + 1
// Secondary counter variable and for-loop
for ($j = 0; $j < $i; $j++) {
// Adding the dates to $qucls, formatting the string, ...
// Access them like above: $qucls[$j]
// Do not increase $j manually though - the for loop does that for you already
}
Please note that this code is untested. It's syntactically correct though.
On a side note: You are currently using three different database queries to gather the data.
You can easily merge them into a single query using SQL JOINs. If you want somebody to show you how to do that, you can show them in a seperate question and ask for them to be joined into one.
For example I have a mysql_num_rows results of 4,8,15,16,23,42 in a query that is inside a while loop of another query. My question is how can I total all the results inside that while loop? (Total of 133) Thanks.
EDIT:
How about if I want to get the percentage per each result of mysql_num_rows inside my while loop? Example: 4,8,15,16,23,42. Total is 108. $sum = 108. Percentage of 4 = 4/$sum = 3.7%, 8 = 8/$sum = 7.4% and so on..
Try something like this:
$Sum = 0;
while ($SomeInvariant)
{
mysql_query($SomeQuery);
$Sum += mysql_num_rows();
}
echo 'The sum is: ' . $Sum;
However, this approach is not very efficient (what if $SomeInvariant is true for many iterations, and your app has even more concurrent users?). To account for this, I would recommend restructuring your approach so the addition is done in SQL. This way, your query could look something like this: SELECT SUM(ColumnName) FROM ....
UPDATE: Addressing follow-up question in the comments
If you don't already have the sum available from the query, then you'll have to loop over the dataset twice. On the first pass, you'll calculate the sum. On the second pass, you'll calculate the ratio of each value to the sum.
For example:
$Sum = 0;
$Rows = array();
while ($SomeInvariant)
{
mysql_query($SomeQuery);
$Value = mysql_num_rows();
$Rows[] = $Value; // Push the value onto the row array
$Sum += $Value; // Add the value to the cumulative sum
}
echo 'The sum is: ' . $Sum;
foreach ($Rows as $Row)
{
echo $Row . '/' . $Sum . ' = ' . number_format($Row / $Sum) . '%';
}