key tells the date picker to use the date format that Symfony expects.This can be tricky: if the date picker is misconfigured, Symfony won't understand the format and will throw a validation error.that validates whether the city and zip code match.Unfortunately, there is no "matching City And Zip Code" field in your form, so all that Symfony can do is display the error on top of the form.
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Each of these allies have their own perimeters which may or may not trust ours. As noted in the Introduction, we trust nothing and nobody.
The common phrase you will have seen in PHP is to never trust “user input”.
So, we need to always filter and validate the user entered before storing it in application’s database.
In this article, we will learn how to perform basic validation of form in php.