<?php // inspired by discussion at: http://stackoverflow.com/questions/11158772/assigning-null-to-a-variable-in-php-what-does-that-do $a = 1; $a = null; echo isset($a) ? 'true' : 'false', "\n"; // false var_dump($a); // 'NULL' -- but no error notice - bug ? type changed to NULL unset($a); // now variable undefined var_dump($a); // error notice and value NULL echo isset($a) ? 'true' : 'false', "\n"; // false
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