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Validating form data

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This is achieved by grouping together validation functions in "modules", making it possible to load only those functions that's needed to validate a particular form.This plugin is available through cdnjs, npm, bower and github.

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Here you can read more about styling of the form and error dialogs.If you want to allow any kind of letters (not only A-Z) you're looking for the letternumeric validator.Validate qty of checkboxes in a group (same name) have been checked, using min, max or range.Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.An email address must contain at least a ‘@’ sign and a dot (.).

Also, the ‘@’ must not be the first character of the email address, and the last dot must at least be one character after the ‘@’ sign.

Input validation should be applied on both syntactical and semantic level.

Syntactic validation should enforce correct syntax of structured fields (e.g.

It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.

Input validation can be used to detect unauthorized input before it is processed by the application.

This chapter will begin by rehashing the fundamentals of secure PHP programming.