How can one troubleshoot and debug issues with fetching data in a while loop in PHP?

When fetching data in a while loop in PHP, one common issue could be an infinite loop due to incorrect conditions or query results not being fetched properly. To troubleshoot this, check the conditions in the while loop to ensure they are correctly set and that the data is being fetched properly from the database. Additionally, you can use debugging techniques such as printing out variables to track the flow of the loop and identify any potential issues. 

// Example code snippet to fetch data in a while loop with debugging

// Connect to database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Query to fetch data
$query = "SELECT * FROM table";
$result = mysqli_query($connection, $query);

// Check if query was successful
if ($result) {
    // Fetch data in a while loop
    while ($row = mysqli_fetch_assoc($result)) {
        // Debugging: print out fetched data
        print_r($row);
        
        // Process fetched data
        // ...
    }
} else {
    echo "Error: " . mysqli_error($connection);
}

// Close database connection
mysqli_close($connection);

Keywords

while loop debugging data fetching PHP troubleshooting

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