<?php class Forms { private $_age, $_year; public function setAge($age) { $this->_age = $age; } public function getAge() { return (is_null($this->_age) || !is_int($this->_age)) ? null : $this->_age; } } test(21); test('test'); test(null); function test($set_to) { $form = new Forms(); $form->setAge($set_to); if($age = $form->getAge()) { echo 'Age is '.$age.'</br>'; } else { echo 'Age is not valid (null or non-int)</br>'; } }
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