Loop through all rows of a single column in php - php

Question

I've got a while loop retrieving the information from this statement
$stmt = $conn->prepare("SELECT images.*, users.profile_image, comments.* FROM
images LEFT JOIN users ON images.user_id = users.user_id LEFT JOIN comments ON
comments.user_id = users.user_id AND images.id = comments.image_id WHERE
images.id = :id");
No problems here, but I need to loop the comments again, otherwise the first loop, loops again because there are two rows in the comments table. This displays everything again but with row 2 of the comments. How can I make it only loop the comments. The first loop will only ever retrieve one result since it is always a unique id.
try {
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
$stmt->bindParam(':id', $id);
$conn->beginTransaction();
$stmt->execute();
$conn->commit();
while ($row = $stmt->fetch())
{
$comment = $row['comment'];
$title = $row['title'];
$image = $row['image'];
$username = $row['username'];
$category = $row['category'];
$description = $row['description'];
$comments = array($row['comment']);
}
?>
<h1><?php echo"$title"; ?></h1>
<img style="max-width: 100%; max-height:100%; margin-left: auto; margin-
right: auto; display:block;" src="<?php echo "$image" ?>"/>
<?php
echo "<h2><span class='by'>By </span><a
href='users.php/$username.html'>$username </a></h2>";
echo "<h2><span class='by'>In the </span><a href='browse.php?
category=space'>$category </a><span class='by'>category</span></h2>";
echo "<h2><span class='by'>About this image:</span></h2>
$description";
?>
<?php
echo "<h2><span class='by'>Comments</span></h2> $comments";
?>
<?php }
else {
if(!isset($row['id'])){
echo "empty";
}
}
?>
Thanks!
Update
while ($crow = $cstmt->fetch())
{
if($crow == false){
echo "nothing here";
}
else {
$comment = $crow['comment'];
echo "$comment"; ?><br /><br /><?php
}
}

Answer 1

You are probably going to need to split this up into a seperate query or use some logic to establish if it is a new Image or not
EG if split :
<?php
$stmt = $conn->prepare("SELECT images.*, users.profile_image FROM
images LEFT JOIN users ON images.user_id = users.user_id WHERE
images.id = :id");
try {
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
$stmt->bindParam(':id', $id);
$conn->beginTransaction();
$stmt->execute();
$conn->commit();
while ($row = $stmt->fetch())
{
$comment = $row['comment'];
$title = $row['title'];
$image = $row['image'];
$username = $row['username'];
$category = $row['category'];
$description = $row['description'];
// $comments = array($row['comment']);
}
?>
<h1><?php echo"$title"; ?></h1>
<img style="max-width: 100%; max-height:100%; margin-left: auto; margin-
right: auto; display:block;" src="<?php echo "$image" ?>"/>
<?php
echo "<h2><span class='by'>By </span><a
href='users.php/$username.html'>$username </a></h2>";
echo "<h2><span class='by'>In the </span><a href='browse.php?
category=space'>$category </a><span class='by'>category</span></h2>";
echo "<h2><span class='by'>About this image:</span></h2>
$description";
?>
<?php
// THIS QUERY WON'T WORK , IT IS FOR CONCEPT ONLY
$CommentsStmt = $conn->prepare("SELECT comments.* FROM comments WHERE comments.user_id = :user_id AND comments.image_id = :image_id");
$CommentsStmt->bindParam(':user_id', $row['user_id'] , ':user_id' , $row['image_id']);
$conn->beginTransaction();
$CommentsStmt->execute();
$CommentsStmt->commit();
// add a check if it is blank
echo "<h2><span class='by'>Comments</span></h2> ";
while ($CommentsRow = $stmt->fetch())
{
echo $CommentsRow['comment'],'<br /><br />';
}
?>
<?php }
else {
if(!isset($row['id'])){
echo "empty";
}
}
?>
a sample for the non-split version
/************
****
******** only output the image details if this is a new image :
****
************/
// NOT SURE WHERE TH IMAGE ID IS COMING FROM SO SUSTITUTE IT HERE:
$current_image_id = $id;
if($previousImageId !== $current_image_id){
?>
<h1><?php echo"$title"; ?></h1>
<img style="max-width: 100%; max-height:100%; margin-left: auto; margin-
right: auto; display:block;" src="<?php echo "$image" ?>"/>
<?php
echo "<h2><span class='by'>By </span><a
href='users.php/$username.html'>$username </a></h2>";
echo "<h2><span class='by'>In the </span><a href='browse.php?
category=space'>$category </a><span class='by'>category</span></h2>";
echo "<h2><span class='by'>About this image:</span></h2>
$description";
}
/************
****
******** END --- only output the image details if this is a new image :
****
************/