获取特定行的列值

Question

I need to fetch a particular column value of a particular row using PHP in MySQL. Here is an example, check this imag I want to fetch the mostOnline and its value, I've tried this below code but doesn't work

<?php
    $query = $forumdb->prepare("SELECT variable FROM smf_settings WHERE Value = 'mostOnline' LIMIT 1");
    $query->execute();
    $result = $query->fetch();
?>
<div class="media-body">
<p id="greet" align="left">Total Members: <?php echo $result ?> <p>
</div>

I'm pretty sure I've done some mistakes, how could that be fixed and be shown? I'm using PDO by the way.

Answer 1

try this

$query = $forumdb->prepare("SELECT variable FROM smf_settings WHERE variable = 'mostOnline' LIMIT 1");
$result = $query->fetch();
print_r($result);
echo $result['value'];//this should echo 211

Answer 2

You are trying to fetch data from Value column where the value is mostOnline . Which is definitely not correct.

 "SELECT variable FROM smf_settings WHERE Value = 'mostOnline' LIMIT 1"

Try this:

$query = $forumdb->prepare("SELECT variable, value FROM smf_settings WHERE variable = 'mostOnline' LIMIT 1");

In your HTML:

<p id="greet" align="left">Total Members: <?php echo $result['value'];?> </p>

Note the improper closing </p> tag in your code too.

Output:

Total Members: 211

Answer 3

your code is incomplete because you have to bind the result like this:

<?php
    $data = 'mostOnline';  
    $result = 0; // if database connection or error default is 0 
        if ($query = $forumdb->prepare("SELECT variable FROM smf_settings WHERE Value=?  LIMIT 1")) {
        $query->bind_param('s', $data);
        $query->execute();
        $query->bind_result($variable);
        $query->store_result();
        $selected_rows = $query->num_rows;

        if ($selected_rows > 0) {
           while($query->fetch()) {
           $result = $variable;
           }
        } else {
        $result = 0;
        }
        $query->free_result();
        $query->close();
        }

    @$forumdb->close();
?>

<div class="media-body">
<p id="greet" align="left">Total Members: <?php echo $result; ?> <p>
</div>