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Simple form field validation, demonstration

This is an example about how to use this function. Check also the code on the snippet page for further explanation.

I used a different style for form fields from the type text if they are empty (notice the yellow background color for the text fields).

Test this form

Required fields: name, your time, some field, checkbox

 

Related PHP functions:

array_key_exists | explode | in_array | count | ltrim

Click here for the PHP validation script.