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# __construct()
 -  can take no argument
 -  can take an array of named sfValidator objects
 -  throws an InvalidArgumentException when passing a non supported first argument
# implements ArrayAccess
 - sfValidatorSchema implements the ArrayAccess interface for the fields
 - sfValidatorSchema implements the ArrayAccess interface for the fields
 - sfValidatorSchema implements the ArrayAccess interface for the fields
 - sfValidatorSchema implements the ArrayAccess interface for the fields
 - sfValidatorSchema implements the ArrayAccess interface for the fields
 - sfValidatorSchema implements the ArrayAccess interface for the fields
 - sfValidatorSchema implements the ArrayAccess interface for the fields
# ->configure()
 -  sets  option to false by default
 -  sets  option to true by default
 -  has a default error message for the  error
 -  can override the default value for the  option
 -  can override the default value for the  option
 -  can override the default message for the  error message
# ->clean()
 -  converts null to empty array before validation
 -  throws an InvalidArgumentException exception if the first argument is not an array of value
 -  returns the string unmodified
 -  throws an sfValidatorErrorSchema exception if a you give a non existant field
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# required fields
 -  throws an sfValidatorErrorSchema exception if a required field is not provided
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# ->getPreValidator() ->setPreValidator()
 -  returns the current pre validator
 -  throws an sfValidatorErrorSchema exception if a pre-validator fails
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# ->getPostValidator() ->setPostValidator()
 -  returns the current post validator
 -  executes post validators
 -  throws an sfValidatorErrorSchema exception if a post-validator fails
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  returns null values for fields not present in the input array
# extra fields
 -  filters non existant fields if  is true
 -  filters non existant fields if  is true
 -  do not filter non existant fields if  is false
 -  do not filter non existant fields if  is false
# one validator fails
 -  throws an sfValidatorErrorSchema exception if one of the validators fails
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# several validators fail
 -  throws an sfValidatorErrorSchema exception if one of the validators fails
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# postValidator can throw named errors or global errors
# postValidator throws global errors
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# postValidator throws named errors
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# complex postValidator
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
 -  throws an exception with all error messages
# __clone()
 -  clones embedded validators
 -  clones embedded validators
 -  clones embedded validators
 -  clones embedded validators
 -  clones embedded validators
 -  clones the pre validator
 -  clones the post validator
 -  clones the pre validator
 -  clones the pre validator
 -  clones the post validator
 -  clones the post validator
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