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      NULL
      Types
      PHP Manual

      NULL

      The special NULL value represents a variable with no value. NULL is the only possible value of type NULL.

      Note: The null type was introduced in PHP 4.

      A variable is considered to be null if:

      • it has been assigned the constant NULL.

      • it has not been set to any value yet.

      • it has been unset().

      Syntax

      There is only one value of type null, and that is the case-insensitive keyword NULL.

      <?php
      $var       = NULL;       
      ?>

      See also the functions is_null() and unset().

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