Sanitizing user submitted data in php before inserting into mysql is required
View Discussion Show Improve Article Save Article View Discussion Improve Article Save Article Data validation is an integral part of web development, especially while working with forms where the user first enters their personal data and then sends that to the database. Data sent in an invalid format can cause DBMS security problems. Hackers often use SQL injections to insert malicious SQL commands into the database. SQL injections can even destroy the database once inserted. Therefore, to safeguard the database from hackers, it is necessary to sanitize and filter the user entered data before sending it to the database. Let’s have an example of SQL injection to make the things
clear. Suppose the hackers enter ‘5=5’ in the ‘Username’ input box and then submits the data. The condition ‘5=5’ is always true. Therefore, the SQL command that will be executed after the ‘Submit’ button is pressed will be SELECT * FROM registration WHERE UserId = 105 OR 1=1; The above SQL command is error-free, and thus the MySQL server will execute it. But, what if the registration table contains sensitive information like credit card information or passwords. A hacker might get information about all the registered users just by entering ‘5=5’ in the username input box, and then misuse it. To prevent such instances from happening, validation and sanitization of user data are required: Let’s have a look at some of the types of checks along with their examples:
Is sanitization compulsory in PHP?Therefore, to safeguard the database from hackers, it is necessary to sanitize and filter the user entered data before sending it to the database.
Why must you always sanitize user inputs before using them in your queries?An application receives queries and requests from untrusted sources that might expose the system to malicious attacks. Input sanitization ensures that the entered data conforms to subsystem and security requirements, eliminating unnecessary characters that can pose potential harm.
What is sanitizing input in PHP?Sanitizing data means removing any illegal character from the data. Sanitizing user input is one of the most common tasks in a web application. To make this task easier PHP provides native filter extension that you can use to sanitize the data such as e-mail addresses, URLs, IP addresses, etc.
Which two functions can sanitize text and validate text format in PHP?PHP filter_var() Function
The filter_var() function both validate and sanitize data. The filter_var() function filters a single variable with a specified filter.
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