Zend Framework comes with a standard set of filter classes. But if you are like me I always forget what is available. The documentation has a not easy to read list of these classes; it is necessary to scroll through the page and identify these.

So I wanted to create a simple list of these, the full documentation can be found here: Zend Filter Set

• Alnum – removing all but alphabetic and digit characters
• Alpha – removing all but alphabetic characters
• BaseName – this filter will return the base name of the file
• Boolean – changes a given input to be a boolean value
• Callback
• Compress – Creates archives
• Decompress
• Decrypt – will decrypt any given string with the provided setting
• Digits – removing all but digit characters
• Dir – Returns directory name component of path
• Encrypt – encrypt any given string with the provided setting
• HtmlEntities
• Int
• LocalizedToNormalized
• NormalizedToLocalized
• Null
• PregReplace
• RealPath
• StringToLower
• StringToUpper
• StringTrim
• StripNewlines
• StripTags