How do I randomly get variables from a mysql database? (using php with dbo connection)
Question
My question clearly states it in the heading, anyway a more elaborate question is how can I randomly show a variable (eg. name) from a mysql database using php with a dbo connection in xampp environment.
Here is what I've come up with from scratch:-
<?php
$db = new PDO
('mysql:dbname=lab1;host=localhost;charset=utf8','root',
'');
$stmt = $db->prepare('SELECT * FROM countries');
?>
<head>
<meta charset="UTF-8"/>
<p>RANDOM!</p>
</head>
<body>
<?php
$stmt -> execute();
foreach($stmt as $row){
$something = array ($row['name'] . $row['name']);
}
$rand_keys = array_rand($something, 1);
echo $something[$rand_keys[0]] . "\n";
?>
</body>
Seems to not work when I try opening it (from localhost)
2 answers
solution1
0 2017-11-07 21:50:13
You can use order by RAND() like others suggested. But I think the way you trying does not work because the way you are adding elements into the array. Like the following line:
$something = array ($row['name'] . $row['name']);
does not push multiple elements (eg. country names) into the array. It replaces the previous value by a concatenated string of the same country name repeated twice. (so if the country name is Afghanistan your array will always have one element AfghanistanAfghanistan
Change your code like below:
<?php
$stmt -> execute();
$something = [];
foreach($stmt as $row){
$something[] = $row['name'];
}
$rand_keys = array_rand($something, 1);
echo $something[$rand_keys[0]] . "\n";
?>
Hope this will work.
solution2
0 ACCPTED 2017-11-07 22:00:21
Based off your comment of " sorry I was not able to make my question clear, so basically I have a table in mysql, with 4 columns and as of now it has 2 inputted rows, now I want to be able to echo lets say just 1 field (randomly) as I refresh the file when opened from localhost... " ... you will need to do a compound randomize :)
Start with this sql change to randomly just grab one row (of all columns):
SELECT * FROM countries ORDER BY RAND() LIMIT 1
Then retrieve that one row, and then randomly pick from the available columns:
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_NUM);// PDO example, important to fetch by indexes, not associative names
echo $row[ rand(0,count($row)) ];
That should randomly pull one column from the randomly grabbed row.
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