What is the potential issue with having a SQL query inside a while loop in PHP?

Having a SQL query inside a while loop in PHP can result in multiple unnecessary database calls, which can significantly impact performance. To solve this issue, you can fetch all the required data from the database outside the loop and then iterate over the fetched results in the loop. 

// Fetch data from the database outside the loop
$query = "SELECT * FROM table_name";
$result = $mysqli->query($query);

// Check if the query was successful
if ($result) {
    // Iterate over the fetched results in the loop
    while ($row = $result->fetch_assoc()) {
        // Your code here
    }
} else {
    // Handle query errors
}

Keywords

SQL query while loop performance database optimization code efficiency

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