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View source for Add related functions to sections

Output escaping
  1. HTML (echo or print)
    1. http://php.net/manual/function.htmlspecialchars.php
Input filtering 
  1. https://www.php.net/manual/en/function.strip-tags.php
  2. https://www.php.net/manual/en/function.trim.php
Data Filtering
  3. https://www.php.net/manual/de/filter.filters.sanitize.php
SQL
  1. https://www.php.net/manual/en/mysqli.real-escape-string.php mysqli_real_escape_string