How can the code be modified to ensure that each entry in the database is properly checked for the selected option?

The issue can be solved by implementing a loop that iterates through each entry in the database and checks if it matches the selected option. This can be achieved by querying the database for all entries and then using a conditional statement to compare each entry with the selected option. 

// Assuming $selectedOption contains the selected option value

// Query the database for all entries
$query = "SELECT * FROM table_name";
$result = mysqli_query($connection, $query);

// Check each entry for the selected option
while ($row = mysqli_fetch_assoc($result)) {
    if ($row['column_name'] == $selectedOption) {
        // Do something with the matching entry
    }
}

Keywords

PHP database validation form submission error handling

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