Separate records with comma - php

Question

I'm new to php and I want to separate the records with a comma.
Database:
the table in sql
I use this code to get the data:
<?php
$id = get_the_ID();
$sql = "SELECT *
FROM tablename
WHERE parent_id=$id";
$result = $conn->query($sql);
while($row = mysqli_fetch_array($result))
{
echo "Test: " . $row["value"]. "<br>";
}
mysqli_close($con);
?>
It return twice as:
Test: Test
Test: Test1
I want to separate the records with a ',' like this:
Test: Test, Test1

Answer 1

Store your values in an array and than implode with ",". You will get the result:
$id = get_the_ID();
$sql = "SELECT *
FROM tablename
WHERE parent_id=$id";
$result = $conn->query($sql);
$yourArr = array();
while($row = mysqli_fetch_array($result))
{
$yourArr[] = $row["value"];
//echo "Test: " . $row["value"]. "<br>";
}
echo "Test: ". implode(",",$yourArr);

Answer 2

You can do this entirely in MySQL using GROUP_CONCAT:
<?php
$id = get_the_ID();
$sql = "SELECT `parent_id`, GROUP_CONCAT(`value` SEPARATOR ', ') AS comma_separated_values
FROM tablename
WHERE `parent_id` = '$id'
GROUP BY `parent_id`";
$result = $conn->query($sql);
while ($row = mysqli_fetch_array($result))
{
echo 'Test: ' . $row["comma_separated_values"]; // Test: test, test2
}
mysqli_close($con);
?>
You should change the "comma_separated_values" name to something more appropriate for your data.
In your particular case, you would not need the while() loop either as we're limiting the MySQL to a single row.
If you were to remove the WHEREparent_id= '$id' from the SQL query, then you could return the results of multiple parent_id values. For example:
while ($row = mysqli_fetch_array($result))
{
echo 'Parent ' . $row['parent_id'] .': ' . $row["comma_separated_values"] . '<br>';
}
Would return:
Parent 292: Test1, Test2
Parent 293: Test3, Test4
Parent 294: Test5, Test10, Test50
etc...

Answer 3

you can use update query for this
$query="Update tablename set value=CONCAT(value,',test1') where parentid='295'";
$result=mysqli_query($conn,$query);