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// via wiping out possible options of validator
$validate = new Zend_Validate_Callback('is_numeric');
$validate ->setOptions(array());
// via create_function() callback
$callback = create_function('$v', 'return is_numeric($v);');
$validate = new Zend_Validate_Callback($callback);
// via anonymous function callback (for PHP >= 5.3)
$validate = new Zend_Validate_Callback(function($v){
return is_numeric($v);
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