从php / MySql中的特定列检索数据

Question

I'm using WordPress with XAMPP. I'm trying to fetch the post title from a column called post_title from a table called ltport_posts by using mysqli_fetch_row() function. The connection with the database is working just fine. However, post titles don't seem to be written in the news ticker. Now I know that $row variable is an enumerated array, so we should write the offset number to access the column. It should be noted that the while loop is working since I have four rows in the ltport_posts and four <div> 's are generated (browser's inspect element is showing me that). But the whole tag is empty:

<div class="ticker-wrap">
<div class="ticker">
<div class="ticker__item"> </div>
<div class="ticker__item"> </div>
<div class="ticker__item"> </div>
<div class="ticker__item"> </div>
</div>
</div>

Here's the php/HTML code:

 <div class="ticker">
        <?php $query="SELECT post_title from ltport_posts";
        if($result=mysqli_query($conn,$query))
        {
            while($row=mysqli_fetch_row($result))
            {?>
            <div class="ticker__item"><?php printf("%s", $row[5]); ?> </div>
        <?php }
        mysqli_free_result($result);
    }
    mysqli_close($conn);?>
</div>

Answer 1

mysqli_fetch_row

mysqli_result::fetch_row -- mysqli_fetch_row — Get a result row as an enumerated array

Your query is

$query="SELECT post_title from ltport_posts";

You just fetch one column from your query. So you will get only $row[0] .It's indexing start from 0

 while($row=mysqli_fetch_row($result))
            {?>
            <div class="ticker__item"><?php printf("%s", $row[0]); ?> </div>
        <?php }

For fetching multiple column

$query = "SELECT column1, column2,column3,column4 FROM City ORDER by ID DESC";

if ($result = mysqli_query($link, $query)) {

    while ($row = mysqli_fetch_row($result)) {
        printf ("%s (%s)\n", $row[0], $row[1],$row[3], $row[4]);
    }
}

Answer 2

You can do the following:

// Prepare the query
$stmt = "select column FROM table";

// Execute it...
$result = mysqli_query($stmt);

// Fetch Results
$row = mysqli_fetch_assoc($result);

// Output single column
echo $row['column'];

And of course you can loop it through as well with multiple results. mysqli_fetch_assoc will return an array where the keys are the column names.