PHP FormsLesson 26Free preview

PHP Form Validation

This lesson is part of PHP · All levels

Summary

Form validation ensures that the data submitted by the user is complete and compliant with the rules before it is processed. Validation should be done on the server side with PHP so it can't be manipulated, although it can be assisted with HTML5/JavaScript. This lesson discusses checking blank fields, formatting data, and delivering error messages.

Key points

Validation ensures data must be available and in a format
Validation on the server is safer than just relying on JavaScript
Use empty() or isset() to check the data sent
Display clear error messages and do not process invalid data

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