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I enjoy the challenge when someone posts a problem I can get my teeth into.

People still use StackOverflow? That's only half a joke. Their community has always been toxic to newcomers and there's so much emphasis on correctness that anything less than perfect is unacceptable. And there's the hostility towards any form of discussion about what is right that I always mention when this subject comes up. SO is good when you're looking for a precise answer to a specific question, but it's terrible for actually asking the questions, or trying to weigh in as a new person with different answers. But I am glad they dethroned Expert Sex Change in search results.

try foreach ($array as $k => $d) { if ($k > 0) { if (strtotime($d) > strtotime($array[$k-1])+6) { $new[] = "-------------------"; } } $new[] = $d; } $new = Array ( [0] => 2021-02-10 09:04:48 [1] => 2021-02-10 09:04:54 [2] => 2021-02-10 09:05:00 [3] => 2021-02-10 09:05:06 [4] => 2021-02-10 09:05:12 [5] => 2021-02-10 09:05:18 [6] => ------------------- [7] => 2021-02-10 09:06:18 [8] => 2021-02-10 09:06:24 ) [edit...] Alternative solution... $new = []; $ne

$this (programming pun intended) is the correct syntax, but produced a different error than the one you posted about the undefined variable. what was the error message in $this case? i'm going to guess that the database connection probably failed and there's no useful error handling in the code. while not the cause of the most immediate problem, your main code should be responsible for creating the database connection, then use dependency injection to supply that to any class that needs it. by making each class responsible for getting a specific database connection, your code is not ge

TIP: If you are creating home-grown charts, plotting the values is the easy bit. 95% of the coding effort will be in the drawing of chart area, plot area, axes, axis labels, scaling, titles etc. You can sidestep this with a simple table with horizontal bars. EG CODE EXAMPLE... <?php $values = [ 'Strongly Disagree' => 7, 'Disagree' => 10, 'Neither' => 12, 'Agree' => 25, 'Strongly Agree' => 41 ]; function valueChart(&$values) { $ou

Sort the array first. Assuming you start with ... $options = [ [ 'type' => 'Visual disability', 'name' => 'Audio-described cut-scenes' ], [ 'type' => 'Visual disability', 'name' => 'Highlighted path to follow' ], [ 'type' => 'Physical disability', 'name' => 'Sensitivity settings for all the controls' ], [ 'type' => 'Visual disability', 'name' => 'Screen readers on menus' ], [ 'type' => 'Visual disability', 'name' => 'Slow down the game speed' ], ]; then ...

That's why I laid it out the way I did with the comments - so it would be easy for you get the separate feet/inches values if you still wanted to go that way. [edit] Look more closely at my code - you require two substring_index()s to extract the inches. The inner to get the string before the final " and the outer one to get the string after the ' SET feet = substring_index(@height, '\'', 1) * 12 , inches = substring_index(substring_index(@height, '"', 1), '\'', -1)

Meanwhile, here's an alternative solution to my previous one, this one without the SQL variables. SELECT SUM(CASE WHEN DATE(datein) > DATE(dateout) THEN DATEDIFF(datein, dateout) - 1 ELSE 0 END ) as tot_absent FROM ( SELECT a.dateout , MIN(b.datein) as datein FROM ajoo_login a LEFT JOIN ajoo_login b ON a.dateout < b.datein GROUP BY a.dateout ) logins; +------------+ | tot_absent | +------------+ | 327 | +------------+

OK, I loaded your data into a test table INSERT INTO ajoo_login (datein, dateout) VALUES ('2019-03-30 17:05:24', '2019-03-30 17:09:47'), ('2019-04-01 15:13:32', '2019-04-01 15:19:46'), ('2019-04-04 23:37:21', '2019-04-04 23:50:51'), ('2019-04-18 15:28:35', '2019-04-18 15:33:10'), ('2019-04-23 16:35:20', '2019-04-23 16:42:35'), ('2019-04-24 12:03:07', '2019-04-24 12:10:28'), ('2019-05-01 08:05:48', '2019-05-01 08:20:28'), ('2019-05-08 18:04:04', '2019-05-08 18:14:57'), ('2019-05-09 08:18:15', '2019-05-09 08:29:38'), ('2019-06-18 12:49:01', '2019-06-18 13:10:15'), ('2019-09-05 17:17:33', '20

NOTE: both instances of $db->query(..) in the above post should be $db->prepare(..)

However, using the string just as far as the the first entity $valrD = json_decode(valrGet, true); echo '<pre>$valrD = ', print_r($valrD, 1), '</pre>'; gives therefore $target = 'BTC/ZAR'; foreach ($valrD['response']['entities'] as $k => $ents) { if ($ents['pair_name'] == $target) { echo "$target asking price : {$ents['ask']['price']}<br>"; break; } } outputs "BTC/ZAR asking price : 179382.54"

if ($success) { $_SESSION["userLoggedIn"] = $username; header("Location:index.php"); }else{ $error = $account->getError(Constants::$registerFailed); } It's a good practice to use an exit after the header ("Location ...

Short answer: it's safe. Longer answer: it's as safe as any other PHP file on your server. It's a common practice to put this script, or at least a script that defines variables/constants with database credentials, in a PHP file that is not located inside the web root (eg, outside of your public_html or www or whatever directory that your site is based in) because if it's not an actual page then it really shouldn't be in the root; this practice is easy to achieve when you get larger sites that have a single public_html/index.php that runs an "application" or some similar concept whose fil

1 and 2 would presumably be input from the web page. The rest would be something like: for ($m=1; $m<=$M; $m++) { for ($l=1; $l<=$L; $l++) { for ($j=1; $j<=$N; $j++) { #do calculation here storing it in a 2D array } # select minimum here (perhaps min() function) } } # use array sort # use PHP vector class # compute distance from vectors # echo results in desired format

You are missing the step to prepare the query before binding the parameters. I would strongly advise you use PDO rather than mysqli - much simpler.

If it helps, note that that a <button> element can have a value attribute independent of its label <?php $option = $_GET['option'] ?? ''; if ($option) echo "You chose $option<hr>"; ?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Sample</title> </head> <body> <form> Select an option <button name="option" value="1">Choose me</button> <button name="option" value="2">Choose me</button>

try $temp = []; foreach ($cars as $car) { $qty = intval($car); $key = trim(strstr($car, ','), ','); if (!isset($temp[$key])) $temp[$key] = 0; $temp[$key] += $qty; } foreach ($temp as $k => $t) { $newcars[] = "$t,$k"; }

code that unconditionally (always) outputs the raw database statement errors for the connection, query, prepare, and execute statements, only helps hackers when they intentionally trigger errors, since these errors contain things like the database hostname/ip address, database username, if a password is being used or not, part of the sql syntax, and web server path information. the only time you should output the raw database statement errors is when learning, developing, or debugging code/query(ies) and you are viewing the site as the developer/programmer. at all other times, you should

I created an extra table to define which category the values were in mysql> select * from catval; +-----+------+ | val | cat | +-----+------+ | 1 | 4 | | 2 | 4 | | 3 | 4 | | 4 | 4 | | 5 | 3 | | 6 | 3 | | 7 | 2 | | 8 | 2 | | 9 | 1 | | 10 | 1 | +-----+------+ then $sql = "SELECT a.cat as cata , b.cat as catb FROM datatb d JOIN catval a ON d.grpa = a.val JOIN catval b ON d.grpb = b.val "; $result = $db->query($sql); //categories $cat = [

You could roll your own. function twoColorCircle($a, $b, $sz) { $out = "<svg width='$sz' height='$sz' viewBox='0 0 1000 1000'> <linearGradient id='grad2' x1='0' y1='0' x2='1' y2='0'> <stop offset='0%' style='stop-color:$a'/> <stop offset='50%' style='stop-color:$a'/> <stop offset='50%' style='stop-color:$b'/> <stop offset='100%' style='stop-color:$b'/> </linearGradient> "; $c = 500; $r = 499; $out .= "<circle cx='$c' cy='$c' r='$r' fill='url(#grad

Use $diff->days. $dt1 = new DateTime('2020-05-01'); $diff = $dt1->diff(new DateTime())->d; //--> 14; $diff = $dt1->diff(new DateTime())->days; //--> 44; ->d gives the days as in "1 month 14 days" ->days gives the total days Using SQL: select datediff(curdate(), '2020-05-01') as days; +------+ | days | +------+ | 44 | +------+

foreach ($global_array as $k => $v) { foreach ($global_array as $k1 => $v1) { if ($k==$k1) continue; if (array_values(array_intersect($v, $v1)) == array_values($v1)) { unset($global_array[$k1]); } } }

$q = 'SELECT ID FROM table'; That is a SQL query. You have to run that query through your database, receive the results, and then look for each single matching image in the directory for every returned record. You can probably skip looking in the directory, though. It will only tell you if the file exists. So if you already know (or assume) the file exists then you don't need to bother looking.

Don't worry about the IBD file. MySQL knows how to manage itself, you don't need to go second guessing it because of what you think you saw in Notepad. The question you think you're asking is whether to use an UPDATE or a DELETE+INSERT, but the question you're actually asking is how you should manage uploaded files that can be replaced. The answer to that is... well, it depends. There are two basic options: 1. Forget the previously uploaded file. You don't care about it. Take the new file and stick it wherever you want, update the database, and delete the old file. Gotta delete.

Unlikely Quotes need removing... $query = "UPDATE `greencard` SET `comments`= '$comments', 'sent' = '$sent' WHERE `hospitalnumber`= '$hospitalnumber' and `PIN`= '$PIN'"; ^ ^ and it's easier just to use ... sent = NOW() WHERE ...

Defining a value in the parameter list makes that parameter optional. If it's not provided when the function is called, the it takes on the value assigned to it. Your specific example doesn't really make use of the feature effectively. Take something like this for example though: function findFiles($directory, $includeHidden = false){ $iter = new DirectoryIterator($directory); $list = []; foreach ($iter as $item){ if ($item->isFile()){ $isHidden = $item->getFilename()[0] === '.'; if ($includeHidden || !$isHidden){ $li

I just didn't see the table - the end of that first line was somewhere in my neighbour's living room.

Your randomNr array contains 10 elements so foreach($randomNr as $number) will give 10 columns. You need to pick a random 6 numbers out of the 10. Separate the php code from the html. Use CSS for styling the output. Example <?php $randomNr = range(0,9); $bingokaart = display($randomNr); function display ($arr) { $result = ""; for ($row = 1; $row < 7; ++$row) { $rand6 = array_rand($arr, 6); $result .= '<tr>'; foreach ($rand6 as $n) { $result .= "<td>$row$arr[$n]&

Why are you even attempting to store that duration. You can get it any time you need it with a query. Rule of DB design - don't store derived data. If you really insist on storing it, why do need two queries? UPDATE attendance_records SET duration = timediff(...) WHERE ... - a single update would do the job

They aren't the same width because you don't have any sort of CSS in there that says anything about a width. It's not like the browser can read your mind about how you want it to appear... Have you tried giving the buttons a width?

An alternative to the 2-table option is to treat costs as transactions, just like payments (cost amounts +ve, payment amounts -ve in this example)... DATA TABLE: payment +------+------+------------+--------------+---------+ | uid | name | trans_date | payment_type | payment | +------+------+------------+--------------+---------+ | 1 | kim | 2020-03-01 | cost | 100 | | 1 | kim | 2020-03-02 | card | -100 | | 2 | lee | 2020-03-01 | cost | 95 | | 2 | lee | 2020-03-02 | cash | -95 | | 3 | kent | 2020-03-01 | cost |

I totally agree with @requinix regarding the two tables. However, if you are willing to compromise over the output, you could do something like this SELECT uid , name , SUM(CASE payment_type WHEN 'cash' THEN payment ELSE 0 END) as cash , SUM(CASE payment_type WHEN 'card' THEN payment ELSE 0 END) as card , cost , cost-SUM(payment) as balance FROM payment GROUP BY uid +------+------+------+------+------+---------+ | uid | name | cash | card | cost | balance | +------+------+------+------+

Not sure I would call a registration and login system less complex than threads and posts, but I guess it depends... I suggest you take a look at MariaDB's knowledge base section on database theory.

Of course it needs to exist: you're trying to use it. Can't very well use something that doesn't exist, can you? But perhaps it's not a "Config" class you need to use?

Forgot to provide feedback on my eventual approach. Turned out I was looking for Bézier curves and splines.

I thought I would check out the impact of the larger key. I creted two tables, one with a smallint PK and the other using bigint. CREATE TABLE `keytest_si` ( `id` smallint(5) unsigned NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE `keytest_bi` ( `id` bigint(20) unsigned NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; Then I looked for my largest table that would fit in a smallint. I then wrote the ids from this table to each of the two new tables. mysql> select count(*) from production_status; +----------+ | count(*) |

It doesn't look like the sort of query you would ever need to run more than once, so why store it at all?

Which "index" does the error message refer to? What is the error message? Side note: if you're not doing so already, you'll want to look into password security. More information can be found here: https://www.php.net/manual/en/faq.passwords.php

"Outside a class"? Screenshot #1: grve-wrapper selected below, bounding box shown above is too low, highlighted CSS on the right shows a few rules Screenshot #2: with the position:relative and top:50% rules disabled, the bounding box is in the correct location but the image is too high Screenshot #3: img selected (the one that's visible), bounding box shows it's too high on the page, highlighted CSS shows a few rules Screenshot #4: with the top:-50% rule disabled, the bounding box is in the correct location

try $product_queried = '09shjk1'; $xml=simplexml_load_string($xmlstr) or die("Error: Cannot make object"); $items = $xml->xpath("//PRODUCT[@ITEM='$product_queried']"); if ($items) echo $items[0]['ITEM'] . ' - ' . $items[0]->STOCK . '<br>'; else echo "Not found";

This is suspect. I assume the 'XXX (FK)' column in your initial post is actually customerId - you'll want to join on that unless your business logic is that each customer can only have one invoice in the system, ever.

The user doesn't input the value on checkboxes or radio buttons <button>s are just another type of html element which allow the programmer to set a value independent of its label. In the example below, the value of the clicked button would be sent in $_POST['gender'] <button name='gender' value='M'>Male</button> <button name='gender' value='F'>Female</button>

Not enough information. Where and how was the session variable set? Is there a session_start call at the beginning of this script? There may be other issues, unrelated, with your query as well. You are not using prepared statements which may be OK as long as ':id' is not coming from a web page. Also it is bad practice to use * in a query. Specify only those columns you intend to actually use.

FFS dil_bert. This is one of the most requested mod_rewrite things in existence. Do you know what I'm going to say next? I honestly don't know if you do. Google it.

Yes, make your screen shots however you want them at highest quality. With most quality mobile phones these days, as well as computers with high density displays like the macbook retina displays, you want your images to be 2x the desired size. So if you are going to display an image at 300px wide, then you want the image to be 600px. Here is an article that provides a visual demonstration of the noticeable difference in quality. On an Iphone or Samsung Galaxy, this could make the difference between a screenshot that is blurry and illegible and one that is clear. Having done some

Okay. Fine. So don't track history. And now that you've made a decision I call tell you that I wouldn't store a history for this either. Stop caring about that file. I guess you missed the rather significant part of my post where I tried to explain what it is. Not sure what you're talking about but I'm 99% sure "loop while error is not present" is not the answer. sigh I'm done.

The problem is that you are trying to print_r the result. The object created by that library is large and recursive so you can't just easily dump it.

Does this do it for you? wp_wpforms_entry_fields: +----------+----------+--------------------+ | entry_id | field_id | value | +----------+----------+--------------------+ | 1 | 5 | Laura Norder | | 1 | 13 | School A | | 1 | 16 | Belt 1 | | 1 | 18 | Sparring - $75.00 | | 2 | 5 | Peter Dowt | | 2 | 13 | School B | | 2 | 16 | Belt 2 | | 2 | 18 | Sparring - $90.00 | | 2 | 43 | Belt 3 | |

Can you show us some of your fpdf code? Just a sample of 20-30 lines from one of your routines that generates the pdf file? Just want to make sure of something since I'm still trying to help you.

Reminder: these forums use Let's Encrypt certs. They last for 3+ months and we have a cronjob that automatically renews when needed. A free cert that I never have to worry about expiring and renewing by myself is amazing.