Identical
Zend_Validate_Identical allows you to validate if a given value is
identical with an set haystack.
Supported options for Zend_Validate_Identical
The following options are supported for Zend_Validate_Identical:
strict: Defines if the validation
should be done strict. The default value is TRUE.
token: Sets the token with which the
input will be validated against.
Basic usage
To validate if two values are identical you need to set the origin value as haystack.
See the following example which validates two strings.
isValid($value) {
return true;
}
]]>
The validation will only then return TRUE when both values are
100% identical. In our example, when $value is 'origin'.
You can set the wished token also afterwards by using the method
setToken() and getToken() to get
the actual set token.
Identical objects
Of course Zend_Validate_Identical can not only validate strings,
but also any other variable type like Boolean, Integer, Float, Array or even Objects.
As already noted Haystack and Value must be identical.
isValid($input)) {
// input appears to be valid
} else {
// input is invalid
}
]]>
Type comparison
You should be aware that also the type of a variable is used for validation.
This means that the string '3' is not identical with the
integer 3. When you want such a non strict validation you
must set the strict option.
Form elements
Zend_Validate_Identical supports also the comparison of form
elements. This can be done by using the element's name as token.
See the following example:
addElement('password', 'elementOne');
$form->addElement('password', 'elementTwo', array(
'validators' => array(
array('identical', false, array('token' => 'elementOne'))
)
));
]]>
By using the elements name from the first element as token for the
second element, the validator validates if the second element is equal with the first
element. In the case your user does not enter two identical values, you will get an
validation error.
Strict validation
As mentioned before Zend_Validate_Identical validates tokens
strict. You can change this behaviour by using the strict option.
The default value for this property is TRUE.
123, 'strict' => FALSE));
$input = '123';
if ($valid->isValid($input)) {
// input appears to be valid
} else {
// input is invalid
}
]]>
The difference to the previous example is that the validation returns in this case
TRUE, even if you compare a integer with string value as long
as the content is identical but not the type.
For convinience you can also use setStrict() and
getStrict().
Configuration
As all other validators also Zend_Validate_Identical supports
the usage of configuration settings as input parameter. This means that you can
configure this validator with an Zend_Config object.
But this adds one case which you have to be aware. When you are using an array as
haystack then you should wrap it within an 'token' key when
it could contain only one element.
123));
if ($valid->isValid($input)) {
// input appears to be valid
} else {
// input is invalid
}
]]>
The above example validates the integer 123. The reason for this special case is, that
you can configure the token which has to be used by giving the
'token' key.
So, when your haystack contains one element and this element is named
'token' then you have to wrap it like shown in the example below.
array('token' => 123)));
if ($valid->isValid($input)) {
// input appears to be valid
} else {
// input is invalid
}
]]>