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Size: | 13024 |
Storage flags: | no_autoload,compress/gzip (27%) |
This filter allows you to use own methods in conjunction with Zend\Filter. You don’t have to create a new filter when you already have a method which does the job.
The following options are supported for Zend\Filter\Callback:
The usage of this filter is quite simple. Let’s expect we want to create a filter which reverses a string.
1 2 3 4 | $filter = new Zend\Filter\Callback('strrev');
print $filter->filter('Hello!');
// returns "!olleH"
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As you can see it’s really simple to use a callback to define a own filter. It is also possible to use a method, which is defined within a class, by giving an array as callback.
1 2 3 4 5 6 7 8 9 | // Our classdefinition
class MyClass
{
public function Reverse($param);
}
// The filter definition
$filter = new Zend\Filter\Callback(array('MyClass', 'Reverse'));
print $filter->filter('Hello!');
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To get the actual set callback use getCallback() and to set another callback use setCallback().
Note
Possible exceptions
You should note that defining a callback method which can not be called will raise an exception.
It is also possible to define default parameters, which are given to the called method as array when the filter is executed. This array will be concatenated with the value which will be filtered.
1 2 3 4 5 6 7 | $filter = new Zend\Filter\Callback(
array(
'callback' => 'MyMethod',
'options' => array('key' => 'param1', 'key2' => 'param2')
)
);
$filter->filter(array('value' => 'Hello'));
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When you would call the above method definition manually it would look like this:
1 | $value = MyMethod('Hello', 'param1', 'param2');
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The source code of this file is hosted on GitHub. Everyone can update and fix errors in this document with few clicks - no downloads needed.