What potential issue can arise when using SELECT * in a MySQL query in PHP?

Using SELECT * in a MySQL query can potentially return more data than needed, which can impact performance and increase network traffic. It is recommended to explicitly specify the columns you need in the SELECT statement to avoid retrieving unnecessary data. This can also make the code more readable and maintainable. 

// Explicitly specify the columns needed in the SELECT statement
$sql = "SELECT column1, column2, column3 FROM table_name WHERE condition = 'value'";
$result = mysqli_query($connection, $sql);

// Fetch data and process it accordingly
if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        // Process the data here
    }
} else {
    echo "No results found";
}

Keywords

MySQL SELECT * PHP security vulnerability data leakage

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