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This commonly comes up when building a settings page for your theme, creating and manipulating shortcodes, or saving and rendering extra data associated with a post.
There's a distinction between how input and output are managed, however.
Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.
Data that does not conform to these rules will negatively affect business process execution.
NOTE: Comment Box question types cannot be validated.
You can quickly validate the Multiple Textboxes question type to allow only numerical data (positive whole numbers), and to reveal the option to require a fixed sum.
Otherwise, we'll save the properly validated zipcode.
Word Press thankfully has a few helper functions we can use for most of what we'll commonly need to do: esc_html() we should use anytime our HTML element encloses a section of data we're outputting.We then check to see if the value ended up as zero.If it did, we'll save an empty value to the database.Luckily, there's a number of handy helper functions you can use for most every data type.Sanitization is a bit more liberal of an approach to accepting user data.
In evaluating the basics of data validation, generalizations can be made regarding the different types of validation, according to the scope, complexity, and purpose of the various validation operations to be carried out.