准备好的语句中的$ row [''] PHP

Question

I'm trying to change my mysqli code to use prepared statements.

For some reason I cant get the usual $row[''] to work. I have googled for a while but I just don't get it. My code without prepared statements is like this:

if($result = mysqli_query($con,"SELECT * FROM users")) {
        echo "
            <thead>
                <tr>
                <th>1</th>
                <th>2</th>
                <th>3</th>
                <th>4</th>
                <th>5</th>
                </tr>
            </thead>
            <tbody>";
        while($row = mysqli_fetch_array($result)) {
            if($row['status'] == "1") {
                echo '<tr class="active">';
            } elseif($row['status'] == "2") {
                echo '<tr class="success">';
            } elseif($row['status'] == "0") {
                echo '<tr class="danger">';
            } else {
                echo '<tr class="warning">';
            }
     etc...

This is what I have so far with prepared statements:

$grab_user = $db->prepare("SELECT * FROM users");
if($grab_user->execute()) {
    echo "
        <thead>
            <tr>
            <th>1</th>
            <th>2</th>
            <th>3</th>
            <th>4</th>
            <th>5</th>
            </tr>
        </thead>
        <tbody>";

    while($grab_user->fetch()) {
        $row = $grab_user->fetch_row();

        if($row['status'] == "1") {
            echo '<tr class="active">';
        } elseif($row['status'] == "2") {
            echo '<tr class="success">';
        } elseif($row['status'] == "0") {
            echo '<tr class="danger">';
        } else {
            echo '<tr class="warning">';
        }

Obviously it doesn't seem to work. What am I doing wrong?

Answer 1

fetch_row fetches one row of data from the result set and returns it as an enumerated array, where each column is stored in an array offset starting from 0 (zero) .

so it should be something like $row[0] . Find out the index of status and then use appropriate value.

---

If you need to access with column names, you need to use fetch_assoc then.

like this:

while($row=$grab_user->fetch_assoc()) {    
    if($row['status'] == "1") {
        echo '<tr class="active">';
    } elseif($row['status'] == "2") {
        echo '<tr class="success">';
    } elseif($row['status'] == "0") {
        echo '<tr class="danger">';
    } else {
        echo '<tr class="warning">';
    }
}

---

fetch_row - numeric array

fetch_assoc - associative array

Answer 2

If you want an associative array, you should be using fetch_assoc() , not fetch_row() , which returns a numeric array.

Also, you shouldn't call both fetch() and fetch_assoc() in the loop. Each of them will read the next row, so fetch_assoc() will only get every other row of the results. So it should be:

while ($row = $grab_user->fetch_assoc()) {
    ...
}