And every day like we use to further increase the number of users of the PHP programming language itself continues to develop. One of the most important of these developments Filtering Data.

Different variables for the past control and filtering by the code lines were written. PHP has presented to us by now quite a simple way of filtering the data validation (validation) and to remove (sanitize) process can do.

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The PHP super globals array is a great tool for accessing various input globally from scripts. The $_SERVER super global array contains a very useful member $_SERVER['PHP_SELF']. This globally available, predefined variable provides the filename of the currently executing script. However, it is vulnerable to cross site scripting (XSS) attacks. On its own it works fine as this example shows.