Barand

To find records where there is no match in another table you use a LEFT JOIN. Data from the the second table where there is no match will contain NULL values. SELECT s.name FROM supplier s LEFT JOIN shipment sh ON s.suppid = sh.suppid AND sh.prodid = 'P2' WHERE sh.suppid IS NULL

P.S. Recommend you use INNODB tables rather than MyISAM

Auto_incremented columns must be defined as a key

A couple of possibilities spring to mind. Are the definition and the usage of the variable inside the same scope; for example - is it used inside a function but defined outside that function? Is the definition inside a conditional block of code (eg if() )so that it has not been executed because the condition was false?

if (!is_null($elem) || !$isValidName($elem)) { ^ ???

To include a variable that is defined externally to the map function you need "use()" $calcArray = [ 34, 56, 82 ]; $total = 10; $calcArray = array_map ( function($v) use ($total) { return round($v / $total); }, $calcArray ); echo '<pre>' . print_r($calcArray, 1) . '</pre>'; Alternatively, you can use this syntax... $calcArray = [ 34, 56, 82 ]; $total = 10; $calcArray = array_map ( fn($v) => round($v / $total), $calcArray ); echo '<pre>' . print_r($calcArray, 1) . '</pre>'; See https://www.php.net/manual/en/functions.arrow.php

Your form for entering new events would contain a dropdown listing organisations for the user to choose. The value of each dropdown option would br the organisation's id. This id is posted (with the other event data) for insertion into the event resord.

Logging every login by a registered user is the favoured option. Not only does it give you an audit trail of the logins but it adds functionality, such as being able to count logins in different time periods or determine most popular login times etc.

const LOG_READ_SIZE = 1024; Place that line somewhere in your code that is before you refer to LOG_READ_SIZE and where it will definitely be executed (EG not inside an IF() block.

PHP array... $data = [ 'store_id' => 'test', 'api_token' => 'test', 'checkout_id' => 'test', 'txn_total' => '4.00', 'environment' => 'qa', 'action' => 'preload', 'cart' => [ 'items' => [ [ 'description' => 'Item 1', 'unit_cost' => '1.00', 'quantity' => '3' ], [ 'description' => 'Item 2', 'unit_cost' => '1.00', 'quantity' => '1' ] ], 'subtotal' => '4.00' ] ]; $json = json_encode($data); echo $json; gives this json string (spaces and newlines added for readability) { "store_id":"test", "api_token":"test", "checkout_id":"test", "txn_total":"4.00", "environment":"qa", "action":"preload", "cart":{ "items":[ {"description":"Item 1", "unit_cost":"1.00", "quantity":"3" }, { "description":"Item 2", "unit_cost":"1.00", "quantity":"1" } ], "subtotal":"4.00" } }

Welcome.

JSON is a data structure converted to string format to make storage and transfer easier. Define your json as a a PHP string ... $json_str = ' { "store_id":"test", "api_token":"test", "checkout_id":"test", "txn_total":"4.00", "environment":"qa", "action":"preload", "cart":{ "items":[ { "description":"item 1", "unit_cost":"1.00", "quantity":"3" }, { "description":"item 2", "unit_cost":"1.00", "quantity":"1" } ], "subtotal":"4.00" } } '; Provided it is the correct format you use this in the api call. To use the data in PHP you need to decode it with json_decode()... $data = json_decode($json_str, true); # the second parameter "true" converts it to an array. # without it you get a php object. // view the resulting array data echo '<pre>' . print_r($data, 1) . '</pre>'; ... which gives us ... Array ( [store_id] => test [api_token] => test [checkout_id] => test [txn_total] => 4.00 [environment] => qa [action] => preload [cart] => Array ( [items] => Array ( [0] => Array ( [description] => item 1 [unit_cost] => 1.00 [quantity] => 3 ) [1] => Array ( [description] => item 2 [unit_cost] => 1.00 [quantity] => 1 ) ) [subtotal] => 4.00 ) )

I'd take the easy way out and use the database with a single query DATA TABLE : season; TABLE : price +-----------+----------------+------------+------------+--------+ +----+--------+------+-------+ | season_id | name | start_date | end_date | tariff | | id | tariff | day | price | +-----------+----------------+------------+------------+--------+ +----+--------+------+-------+ | 1 | Winter 2024 | 2024-11-01 | 2024-12-23 | LO | | 1 | ST | 0 | 70 | day 0 = Monday | 2 | Christmas 2024 | 2024-12-24 | 2025-01-02 | PK | | 2 | ST | 1 | 70 | | 3 | Easter 2025 | 2025-04-11 | 2025-04-27 | PK | | 3 | ST | 2 | 70 | | 4 | Summer 2025 | 2025-06-15 | 2025-08-31 | HI | | 4 | ST | 3 | 70 | +-----------+----------------+------------+------------+--------+ | 5 | ST | 4 | 90 | | 6 | ST | 5 | 90 | | 7 | ST | 6 | 70 | day 6 = Sunday TABLE : tariff | 8 | LO | 0 | 55 | +--------+-------------+ | 9 | LO | 1 | 55 | | tariff | description | | 10 | LO | 2 | 55 | +--------+-------------+ | 11 | LO | 3 | 55 | | HI | High season | | 12 | LO | 4 | 75 | | LO | Low season | | 13 | LO | 5 | 75 | | PK | Peak season | | 14 | LO | 6 | 55 | | ST | Standard | | 15 | HI | 0 | 90 | +--------+-------------+ | 16 | HI | 1 | 90 | | 17 | HI | 2 | 90 | TABLE : booking | 18 | HI | 3 | 90 | +----+------------+---------+------------+ | 19 | HI | 4 | 110 | | id | booking_no | room_no | book_date | | 20 | HI | 5 | 110 | +----+------------+---------+------------+ | 21 | HI | 6 | 90 | | 1 | 1 | 1 | 2025-05-07 | | 22 | PK | 0 | 110 | | 2 | 1 | 1 | 2025-05-08 | | 23 | PK | 1 | 110 | | 3 | 1 | 1 | 2025-05-09 | | 24 | PK | 2 | 110 | | 4 | 2 | 5 | 2025-04-25 | | 25 | PK | 3 | 110 | | 5 | 2 | 5 | 2025-04-26 | | 26 | PK | 4 | 125 | | 6 | 2 | 5 | 2025-04-27 | | 27 | PK | 5 | 125 | | 7 | 2 | 5 | 2025-04-28 | | 28 | PK | 6 | 110 | | 8 | 2 | 5 | 2025-04-29 | +----+--------+------+-------+ | 9 | 2 | 5 | 2025-04-30 | +----+------------+---------+------------+ QUERY SELECT b.booking_no , MIN(b.book_date) as `from` , MAX(b.book_date) as until , SUM(p.price) as total FROM booking b LEFT JOIN season s ON b.book_date between s.start_date AND s.end_date LEFT JOIN price p ON coalesce(s.tariff, 'ST') = p.tariff -- tariff defaults to "ST" if no seasons match date AND p.day = weekday(b.book_date) GROUP BY b.booking_no; +------------+------------+------------+-------+ | booking_no | from | until | total | +------------+------------+------------+-------+ | 1 | 2025-05-07 | 2025-05-09 | 230 | | 2 | 2025-04-25 | 2025-04-30 | 570 | +------------+------------+------------+-------+

<?php $images = glob("path/to/folder a/*.*"); foreach ($images as $i) { echo "<img src='$i'>"; }

The DATEDIFF() function will give the difference in days. Use TIMESTAMPDIFF() which lets you the specify the units for the result. mysql> SELECT NOW(), timestampdiff(SECOND, '2025-04-26 20:30:00', NOW()) as diff; +---------------------+------+ | NOW() | diff | +---------------------+------+ | 2025-04-26 21:34:51 | 3891 | +---------------------+------+ 1 row in set (0.00 sec) mysql> SELECT NOW(), timestampdiff(MINUTE, '2025-04-26 20:30:00', NOW()) as diff; +---------------------+------+ | NOW() | diff | +---------------------+------+ | 2025-04-26 21:35:22 | 65 | +---------------------+------+ 1 row in set (0.00 sec)

If the only reason for that value is to write to the DB then you can do it in the insert query... INSERT INTO tablename (colx, coly, colz) VALUES (?, ?, NOW() + INTERVAL 10 MINUTE)

Put icon insisde a link EG... <a href='https://facebook.com'> <i class="fa-brands fa-facebook w3-hover-opacity"></i> </a>

INSERT INTO `Bank_Reason` (`ID`, `ReasonID`, `Reason`,`Colour`) VALUES (1, 0, '---SELECT','#000000'), (2, 1, 'Other',','#0000ff'), ^^ Again!?

INSERT INTO `Bank_Reason` (`ID`, `ReasonID`, `Reason`,Colour') VALUES ^ | unwanted single quote

$surname_counts = array_count_values(array_map(fn($v)=>substr($v, strpos($v, '_', 0)+1), $names)); -> Array ( [jones] => 2 [smith] => 3 [doe] => 2 [jackson] => 1 )

Put this line just before the mysqli connection code... mysqli_report(MYSQLI_REPORT_ERROR|MYSQLI_REPORT_STRICT); Ensure error_reporting is ON. You should now get error messages if there are problems with a query.

PS You aren't doing yourself any favours by insisting on mysqli. PDO is a superior library and easier to use. While you are still learning, put your effort into PDO

Change $pdo = pdoConnect(); to $pdo = new mysqli(HOST, USERNAME, PASSWORD, DATABASE); Job done.

BTW, it seems a pity that that those students who attain a C6 grade should receive only an anagram instead of a Credit

@sule, Here are two version of the program A single loop tracking changes in studentid (as I suggested) Stores data in a muti-dimensional array and uses nested foreach() loops Version 1 <?php define("HOST", 'localhost'); define("USERNAME", '????'); define("PASSWORD", '????'); define("DATABASE", '????'); // default database name function pdoConnect($dbname=DATABASE) { $db = new PDO("mysql:host=".HOST.";dbname=$dbname;charset=utf8",USERNAME,PASSWORD); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); $db->setAttribute(PDO::MYSQL_ATTR_LOCAL_INFILE, true); return $db; } $pdo = pdoConnect(); $res = $pdo->query("SELECT marks.acayear , marks.semester , marks.form , marks.class , marks.studentid , marks.name , marks.subject , marks.class_score1 , marks.exam_score1 , ROUND(marks.total, 1) as total , marks.grade , marks.remarks , RANK() OVER (PARTITION BY marks.acayear, marks.semester, marks.lessonsid ORDER BY marks.total DESC) as rank FROM marks WHERE marks.acayear='2024/2025' AND marks.semester='1' AND marks.form='3' AND marks.class='SCI A' ORDER BY name, subject; "); $previd = 0; $tdata = ''; foreach ($res as $r) { if ($r['studentid'] != $previd) { if ($previd != 0) { // if not the first $tdata .= "\n</table>\n</div>\n</div>\n\n"; // close preceding report } $tdata .= outputReportHeading(...array_slice($r, 0, 6)); $previd = $r['studentid']; } $tdata .= outputSubject(...array_slice($r, 6)); // close last report } $tdata .= "\n</table>\n</div>\n</div>\n\n"; # # FUNCTIONS # function outputReportHeading($acayear, $semester, $form, $class, $studentid, $name) { return <<<HEAD <div class='report w3-container w3-white'> <div class='report-head'> SAVELUGU SENIOR HIGH SCHOOL </div> <div class='report-head'> $acayear ACADEMIC YEAR </div> <div class='w3-row w3-margin-top'> <div class='w3-col m1 w3-center'> [SCHOOL<br>CREST] </div> <div class='w3-col m5 report-subhead'> Student ID: <span class='hval'>$studentid</span> <br> Name: <span class='hval'>$name</span> <br> Semester: <span class='hval'>$semester</span> </div> <div class='w3-col m5 report-subhead'> House: <span class='hval'></span> <br> Gender: <span class='hval'></span> <br> Class: <span class='hval'>$form $class</span> </div> <div class='w3-col m1 w3-center'> [PHOTO] </div> </div> <div class='report-head w3-margin-top'> STUDENT TERMINAL REPORT </div> <div class='w3-responsive'> <table border='1' class='scores'> <tr> <th>Subject</th> <th class='w3-hide-small'>Class Score</th> <th class='w3-hide-small'>Exam Score</th> <th>Total</th> <th>Grade</th> <th>Pos</th> <th>Remarks</th> </tr> HEAD; } function outputSubject($subject, $class_score1, $exam_score1, $total, $grade, $remarks, $rank) { return <<<SUB <tr> <td>$subject</td> <td class='w3-hide-small ca'>$class_score1</td> <td class='w3-hide-small ca'>$exam_score1</td> <td class='ca'>$total</td> <td class='ca'>$grade</td> <td class='ca'>$rank</td> <td>$remarks</td> </tr> SUB; } ?> <!DOCTYPE html> <html lang="en"> <head> <title>Example Reports 1</title> <meta charset="utf-8"> <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <style type='text/css'> body { background-color: #FCF8E8; } .report { margin: 16px; padding: 8px; border: 1px solid gray; } .report-head { font-size: 18pt; font-weight: 600; text-align: center; } .report-subhead { font-size: 14pt; font-weight: 300; } .hval { font-weight: 600; color: blue; } .scores { width: 100%; border-collapse: collapse; } th { padding: 8px 2px; background-color: gray; color: white; } td { padding: 8px 4px; } .ca { text-align: center; } </style> </head> <body> <?= $tdata ?> </body> </html> Version 2 <?php define("HOST", 'localhost'); define("USERNAME", '????'); define("PASSWORD", '????'); define("DATABASE", '????'); // default database name function pdoConnect($dbname=DATABASE) { $db = new PDO("mysql:host=".HOST.";dbname=$dbname;charset=utf8",USERNAME,PASSWORD); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); $db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); $db->setAttribute(PDO::MYSQL_ATTR_LOCAL_INFILE, true); return $db; } $pdo = pdoConnect(); $res = $pdo->query("SELECT marks.acayear , marks.semester , marks.form , marks.class , marks.studentid , marks.name , marks.subject , marks.class_score1 , marks.exam_score1 , ROUND(marks.total, 1) as total , marks.grade , marks.remarks , RANK() OVER (PARTITION BY marks.acayear, marks.semester, marks.lessonsid ORDER BY marks.total DESC) as rank FROM marks WHERE marks.acayear='2024/2025' AND marks.semester='1' AND marks.form='3' AND marks.class='SCI A' ORDER BY name, subject; "); $tdata = ''; # # store the data in a 3D array # $data = []; foreach ($res as $r) { if (!isset($data[$r['studentid']])) { $data[$r['studentid']] = [ 'head' => array_slice($r, 0, 6), 'scores' => [] ]; } $data[$r['studentid']]['scores'][] = array_slice($r, 6); } # echo '<pre>' . print_r($data, 1) . '</pre>'; // uncomment to view array structure # # PROCESS THE ARRAY # foreach ($data as $sdata) { $tdata .= outputReportHeading(...$sdata['head']); foreach ($sdata['scores'] as $subdata) { $tdata .= outputSubject(...$subdata); } $tdata .= "\n</table>\n</div>\n</div>\n\n"; } # # FUNCTIONS # function outputReportHeading($acayear, $semester, $form, $class, $studentid, $name) { return <<<HEAD <div class='report w3-container w3-white'> <div class='report-head'> SAVELUGU SENIOR HIGH SCHOOL </div> <div class='report-head'> $acayear ACADEMIC YEAR </div> <div class='w3-row w3-margin-top'> <div class='w3-col m1 w3-center'> [SCHOOL<br>CREST] </div> <div class='w3-col m5 report-subhead'> Student ID: <span class='hval'>$studentid</span> <br> Name: <span class='hval'>$name</span> <br> Semester: <span class='hval'>$semester</span> </div> <div class='w3-col m5 report-subhead'> House: <span class='hval'></span> <br> Gender: <span class='hval'></span> <br> Class: <span class='hval'>$form $class</span> </div> <div class='w3-col m1 w3-center'> [PHOTO] </div> </div> <div class='report-head w3-margin-top'> STUDENT TERMINAL REPORT </div> <div class='w3-responsive'> <table border='1' class='scores'> <tr> <th>Subject</th> <th class='w3-hide-small'>Class Score</th> <th class='w3-hide-small'>Exam Score</th> <th>Total</th> <th>Grade</th> <th>Pos</th> <th>Remarks</th> </tr> HEAD; } function outputSubject($subject, $class_score1, $exam_score1, $total, $grade, $remarks, $rank) { return <<<SUB <tr> <td>$subject</td> <td class='w3-hide-small ca'>$class_score1</td> <td class='w3-hide-small ca'>$exam_score1</td> <td class='ca'>$total</td> <td class='ca'>$grade</td> <td class='ca'>$rank</td> <td>$remarks</td> </tr> SUB; } ?> <!DOCTYPE html> <html lang="en"> <head> <title>Example Reports 2</title> <meta charset="utf-8"> <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <style type='text/css'> body { background-color: #FCF8E8; } .report { margin: 16px; padding: 16px; border: 1px solid gray; } .report-head { font-size: 18pt; font-weight: 600; text-align: center; } .report-subhead { font-size: 14pt; font-weight: 300; } .hval { font-weight: 600; color: blue; } .scores { width: 100%; border-collapse: collapse; } th { padding: 8px 2px; background-color: gray; color: white; } td { padding: 8px 4px; } .ca { text-align: center; } </style> </head> <body> <?= $tdata ?> </body> </html> Samples