What are some potential issues with using "SELECT *" in MySQL queries in PHP?

Using "SELECT *" in MySQL queries can lead to performance issues and potential security vulnerabilities. It is recommended to explicitly specify the columns you want to select to avoid retrieving unnecessary data and to prevent SQL injection attacks. By specifying the columns, you can also make your code more readable and maintainable. 

// Specify the columns you want to select instead of using "SELECT *"
$sql = "SELECT column1, column2, column3 FROM table_name WHERE condition = 'value'";
$result = mysqli_query($connection, $sql);

// Loop through the results
if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        // Process the data
    }
}

Keywords

MySQL SELECT * PHP performance security

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