PHP Form Input Filtering

Question

I am a PHP newbie and am working on a basic form validation script. I understand that input filtering and output escaping are both vital for security reasons. My question is whe

Answer 1

Depending on what you want to secure, the filter you call might be overactive (see comments). Injectionwise you should be safe since you're using Prepared Statements (see this answer)

On a design note you might want to filter first, then check for empty values. Doing that you can shorten your code ;)