Answer
filter_var() validates and sanitizes data using built-in filters for email, URL, integers, and more.
Quick Answer
filter_var() validates and sanitizes data. FILTER_VALIDATE_EMAIL checks email format. FILTER_SANITIZE_STRING removes tags. FILTER_VALIDATE_INT validates integers. FILTER_VALIDATE_URL checks URL format. Cleaner than writing regex manually. Use for validating user input at entry points. Part of PHP built-ins, no extra library needed.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ