Validating php dating minsk fat
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Required field will check whether the field is filled or not in the proper way.
Very first we have to create a form in html setting action “#” and method “POST” with some fields, when a user clicks on submit button all the data starts travel in URL but it will be hidden, as we set method = “POST”.
You will see how to validate various fields used in general, like text, list, checkbox, radio button and we will also see how to retain POST data, so that after the user submits the form, even if the data supplied is not valid, data is not lost.
The script needs to be able to differentiate between the two stages so the form behaves properly.
To determine whether the form has been submitted by the user, either check the request method (an example follows in the next section) or check for the presence of a specific form control (usually the submit button).
What it does is takes the data passed to the function, strips unwanted characters (extra space, tab, newline) from the beginning and end of the data using the PHP trim() function, strips any quotes escaped with slashes and passes it through htmlspecialchars().
So now instead of typing the same code for each of our input fields we simply check each $_POST variable with the check_input function and that's it.
This prevents the form from breaking if the user submits HTML markup and also is a means of protecting against XSS (Cross Site Scripting) attacks, which attackers will use to try to exploit vulnerabilities in web applications.