loop within loop in PHP MySQL - php

Question

I have created two tables in MySql one where blog content saved and another where blog ID and different pics path saved. I have saved more than one pics in one postID. Now I am trying to fetch the pics and blog post at same time but its not working. code below...
blogposts.php
<?php
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($conn,"SELECT * , upload_data.FILE_NAME from blog_posts LEFT JOIN upload_data ON blog_posts.postID=upload_data.postID ; ");
while($row = mysqli_fetch_array($result))
{?>
<div class="b-slider j-smallslider" data-height="382">
<ul><?php
if (!empty($FILE_NAME)) {
$result = mysqli_query($conn,"SELECT * from upload_data where postID=postID ; ");
while($row = mysqli_fetch_array($result))
{?>
<li data-transition="3dcurtain-vertical" data-slotamount="12">
<img data-retina src="articles/user_data/<?php echo( htmlspecialchars( $row['FILE_NAME'] ) ); ?>">
</li> <?php }} ?>
</ul>
</div>
<div class="b-blog-one-column__info">
Title : <?php echo( htmlspecialchars( $row['postTitle'] ) ); ?>, <?php echo( htmlspecialchars( $row['postCat'] ) ); ?>
<span class="b-blog-one-column__info_delimiter"></span>
Tag : Nllam
<span class="b-blog-one-column__info_delimiter"></span>
<i class="fa fa-comment"></i>12 Comments
</div>
<?php } ?>
The Problem is I am unable to fetch the pics. :(

Answer 1

use this query
$result = mysqli_query($conn,"SELECT blog_posts.* , upload_data.FILE_NAME from blog_posts,upload_data WHERE blog_posts.postID=upload_data.postID");
and then print your results with print_r() function and check its get results or not.

Answer 2

SELECT blog_posts.*, group_concat(upload_data.FILE_NAME) FROM `blog_posts`
LEFT JOIN upload_data on blog_posts.postID = upload_data.postID
GROUP BY blog_posts.postID
Try like this you will get number of post rows and filename concadinated with commas if you have images. then Apply logic to display results. Any help you need. Don't hesitate to ask me.

Answer 3

hope this work;
$post_id = 1337;
$conn = new PDO(......); //get connection
$conn->query('SET group_concat_max_len = 4096;');
$query = "SELECT bp.* ,
(SELECT GROUP_CONCAT(ud.FILE_NAME SEPARATOR ',')
from upload_data ud where ud.postID=bp.postID) as files
FROM blog_posts bp
WHERE bp.postID=:post_id ;";
$result = $conn->prepare($query);
$result->bindParam(":post_id", $post_id);
$result->execute();
//don't really need while for one row but oh well
while($row = $result->fetch()){
$files=$row['files'];
$files = empty($files) ? [] : explode(',', $files);
?>
<div class="b-slider j-smallslider" data-height="382">
<ul>
<?php foreach ($files as $file){?>
<li data-transition="3dcurtain-vertical" data-slotamount="12">
<img data-retina src="articles/user_data/<?php echo( htmlspecialchars( $file ) ); ?>">
</li>
<?php } ?>
</ul>
</div>
<div class="b-blog-one-column__info">
Title : <?php echo( htmlspecialchars( $row['postTitle'] ) ); ?>, <?php echo( htmlspecialchars( $row['postCat'] ) ); ?>
<span class="b-blog-one-column__info_delimiter"></span>
Tag : Nllam
<span class="b-blog-one-column__info_delimiter"></span>
<i class="fa fa-comment"></i>12 Comments
</div>
<?php } ?>