SELECTING multiple rows by 2 columns - php

Question

[ POSTS ]
| id | title | class |
|----|----------|-------|
| 1 | 4567 | 2 |
| 2 | 1234 | 1 |
| 3 | 9124 | 1 |
| 3 | 9124 | w |
________________________
How can i SELECT multiple class column values and sort it to be echoed in HTML like
$query = "SELECT * FROM posts WHERE id = :id"
$statment= $conn->prepare($query);
$statment->execute([':id' => $id]);
while($row = $stmt->fetch()){
$title1 = $row['title'] //WHERE THE CLASS IS 1
$title2 = $row['title'] //WHERE THE CLASS IS 2
echo"
<a>$title1</a>
<a>$title2</a>
}
How do specify which title appear by its class? i already used the id but i want to use the class like
$title1 = $row['id'], AND $row['class'] = 1
$title2 = $row['id'], AND $row['class'] = 2
$titleo = $row['id'], AND $row['class'] = w
to sort it while echo or do i have to go
$query = "SELECT * FROM posts WHERE id = :id AND class = 1"
$query = "SELECT * FROM posts WHERE id = :id AND class = 2"
$query = "SELECT * FROM posts WHERE id = :id AND class = 'w'" //FOR STRINGS

Answer 1

I think you are looking for
SELECT * FROM Posts WHERE class in (1,2,'w') ORDER BY class ASC
This will give you all the posts with the class values within the In () statement. It will show each record separately which means you will have two rows for titles which have multiple class values. Since it looks like you want to separate them using PHP that should be ok. Then you can do that in your while loop like:
$classes = array();
while($row = $stmt->fetch()){
if(!isset($classes[$row['class']])){ $classes[$row['class']] = array(); }
$classes[$row['class']][] = $row['title'];
}
This would give you arrays of Titles for each class:
[
1=>[1234,9124]
2=>[4567]
'w'=>[9124]
]
Then you can output them all in order of the class or by class:
foreach($classes as $key => $class){
echo "Class Value: ".$key; // just to show the order
foreach($class as $title){ echo "<a>".$title."</a>"; }
}
Which will wind up giving you:
Class Value: 1
<a>1234</a>
<a>9124</a>
Class Value: 2
<a>4567</a>
Class Value: w
<a>9124</a>
I am not entirely sure if this leads you to what you are looking for, however, it does give you a workflow to be able to order the posts by class and output them based on class. I hope this helps