在使用UPDATE时，MySQL将列设置为变量值的正确方法是什么？

I am trying to update a column for a certain user with PHP/MySQL. What is the proper way for me to set that equal to a variable?

$style is equal to a value that is from a form (post).

When setting 'style' equal to a string value that is also in single quotes, I do not get an error. I only get an error when setting 'style' equal to a variable.

$query = "UPDATE `users` 
SET `style` = $style
WHERE `id` = $userid;";

Thank you very much.

You still have to put quotes around the variable as they are needed to tell MySQL that is a string. Remember, the variables are interpolated before the query is sent to the MySQL server. So $style is replaced by it's value before the query is run.

$query = "UPDATE `users` 
SET `style` = '$style'
WHERE `id` = $userid;";