If user input is inserted without modification into an SQL query, then the application becomes vulnerable to SQL injection, like in the following example: $unsafe_variable = $_POST['user_input']; m...
Is there an SQL injection possibility even when using mysql_real_escape_string() function? Consider this sample situation. SQL is constructed in PHP like this: $login = mysql_real_escape_string(GetF...
Just looking at: (Source: https://xkcd.com/327/) What does this SQL do: Robert'); DROP TABLE STUDENTS; -- I know both ' and -- are for comments, but doesn't the word DROP get commented as well s...
Is there a catchall function somewhere that works well for sanitizing user input for SQL injection and XSS attacks, while still allowing certain types of html tags?
Possible Duplicates: How does the SQL injection from the "Bobby Tables" XKCD comic work? https://stackoverflow.com/search?q=sql+injection Can someone explain SQL injection? How ...
Let's say I have code like this: $dbh = new PDO("blahblah"); $stmt = $dbh->prepare('SELECT * FROM users where username = :username'); $stmt->execute( array(':username' => $_REQUEST['usernam...
I am very new to working with databases. Now I can write SELECT, UPDATE, DELETE, and INSERT commands. But I have seen many forums where we prefer to write: SELECT empSalary from employee where salary...
How do prepared statements help us prevent SQL injection attacks? Wikipedia says: Prepared statements are resilient against SQL injection, because parameter values, which are transmitted later ...
This is to create a community learning resource. The goal is to have examples of good code that do not repeat the awful mistakes that can so often be found in copy/pasted PHP code. I have requested...
In PHP when submitting strings to the database should I take care of illegal characters using htmlspecialchars() or use a regular expression?
I am working on a form with the possiblity for the user to use illegal/special characters in the string that is to be submitted to the database. I want to escape/negate these characters in the string ...