PHP AdvancedLesson 38Free preview

PHP Filters

This lesson is part of PHP · All levels

Summary

PHP Filters provide standard ways to validate and clear input data, such as checking integers, e-mails, or URLs. Its main function is filter_var() combined with the constants FILTER_VALIDATE_* and FILTER_SANITIZE_*. Using built-in filters makes validation faster and more consistent.

Key points

Apply a validation or sanitization filter to a single value
Filter_VALIDATE_* checks the format, Filter_SANITIZE_* clears the data
FILTER_SANITIZE_STRING deleted the HTML tag, but it is now deprecated
Is a safe option for output sanitation

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