Validating user input in php desperate dating uk

Therefore, taking this situation into account, below I listed the respective signatures corresponding to these strategy classes.Here they are, so have a look at them, please: As shown above, each of the four strategy classes listed previously implements differently the same "validate Data()" method to check a diverse range of user inputs, such as alphabetic and alphanumeric values, and number and email addresses.

As usual with all my articles, feel free to modify the signature of all the classes that I showed here so you can acquire a better understanding of this pattern. Final thoughts Unfortunately, we’ve come to the end of this series.

However, I hope that after reading these two articles, you’ll have a better idea not only of how the strategy pattern works, but how it can be used in real situations.

Introduction Going back quickly to the topics covered in the first tutorial of the series, certainly you’ll remember that I explained the foundations of the strategy design pattern, and complemented the theory with some practical examples of how to apply this handy pattern in PHP 5.

Based upon this scenario, I developed a set of simple PHP classes.

In the next few lines I’m going to demonstrate how to use the strategy pattern in a useful case, that is validating user-supplied input. Now that you know the purpose of this last part of the series, let me show you how to implement the strategy pattern to check a wide range of user inputs. In consonance with the concepts that I expressed in the beginning, my objective here is to demonstrate how the strategy pattern can help to create a data validation system capable of verifying different types of user data.

Bearing in mind this important requisite, the first step that I’m going to take will consist of building a validation strategy selector (naturally, represented by a PHP class) which will determine what validation strategy must be applied, in accordance with the type of data submitted by a user.

Of course, it’s possible to extend the initial validation capacity of the whole data checking system even more, simply by adding new strategy classes to the existing ones.

This is definitely a process that can be performed with minor hassles. At this point, you’ve seen not only how the validation strategy selector looks, but how the four strategy classes have been properly defined.

Okay, at this stage I’m sure that you understand how the prior validation strategy selector works.

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