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09-Aug-2018 14:41

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With more and more personal information being stored on the Web—credit card data, social security numbers, maiden names, favorite pets—today's PHP developer cannot afford to be ignorant when it comes to security.

Sadly, most beginning programmers fail to understand the truth about security: there is no such thing as "secure" or "insecure." The wise programmer knows that the real question is a site is.

After that a quick example shows ways to validate different kinds of data that might come from an HTML form.

The third topic is the new-to-PHP 5 PECL library called Filter.

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The next step is to make input fields required and create error messages if needed.

Its usage isn't very programmer-friendly, but the way it wraps all of the customary data filtering and sanitizing methods into one interface makes it worth knowing.

After that, two different uses of the PEAR Auth package show an alternative way to implement authorization in your Web applications.

HP 5.3.3 and 5.2.14 had a bug ( related to FILTER_VALIDATE_EMAIL, which resulted in segfault when validating large values.

Simple and safe workaround for this is using strlen() before filter_val().

Once any piece of data is stored in a database, in a text file, or on a Post-it note in your office, its security is compromised.

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