显示在SQL查询中修改的数据

Question

I have an table 'users'. Users can modify their data eg. name, surname, email. and I want to send email to admin which will contain details about modified data. If user change only name and email i want to grab only changed data - in this case only name and email.

My form:

<form action="" method="post">
<input type="text" name="name">
<input type="text" name="surname">
<input type="text" name="email">
<input type="submit" value="Send">
</form>

It is possible that I can grab data which was modified in sql query, excluding data which are the same in table and in the form? I have an idea that I must check each POST field that is the same as in database, but I have many more fields and this solution is not so good:

if($row['email'] !== $_POST['email']) { $changed_email = $_POST['email']; } 

if($row['name'] !== $_POST['name']) { $changed_name = $_POST['name']; }

There is any other solution that I can grab only modified data? I'm using Zend Framework and all table fields are called same as POST data.

Answer 1

You could loop through your $_POST array and use the key to fetch the corresponding value from the DB:

foreach($_POST as $key => $value){
    if($value !== $row[$key]){
        $changed[$key] = $value;
    }
}

However you may want to exclude some fields in the loop (for example the submit button):

$excluded_keys = array('submit', 'some_other_key');
foreach($_POST as $key => $value){
    if(in_array($key, $excluded_keys)) continue;

    if($value !== $row[$key]){
        $changed[$key] = $value;
    }
}