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Standard Filter Classes

Alnum
Alpha
BaseName
Boolean
Callback
Compress and Decompress
Digits
Dir
Encrypt and Decrypt
HtmlEntities
Int
LocalizedToNormalized and NormalizedToLocalized
Null
PregReplace
RealPath
StringToLower
StringToUpper
StringTrim
StripNewLines
StripTags

Zend Framework comes with a standard set of filters, which are ready for you to use.

Double filtering
Alnum

Zend Framework

Zend_Filter: