Added w3-greyscale, w3-greyscale-max, w3-greyscale-min and w3-greyscale-hover. Added w3-grayscale, w3-grayscale-max, w3-grayscale-min and w3-grayscale-hover. Added w3-sepia, w3-sepia-max, w3-sepia-min and w3-sepia-hover.
While the techniques in this document should help people author HTML that conforms to "Web Content Accessibility Guidelines 1.0", these techniques are neither guarantees of conformance nor the only way an author might produce conforming content.
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.
» PHP forms "How to" The "How to" section consists of articles and code examples covering some specific issues, requirements and features of PHP forms.