Aedating v4 0 0002 php null pass
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NULL is supposed to indicate the absence of a value, rather than being thought of as a value itself.
It's the empty slot, it's the missing information, it's the unanswered question. This is why a variable containing a NULL is considered to be unset: it doesn't have a value.
A simple example to demonstrate the behavior: isset($var) is FALSE empty($var) is TRUE is_null($var) is TRUE isset($novar) is FALSE empty($novar) is TRUE is_null($novar) gives an Undefined variable error $var IS in the symbol table (from get_defined_vars()) $var CAN be used as an argument or an expression. isset($var) intead of is_null($var) and then set $var = NULL if the variable needs to be used later to guarantee that $var is a valid variable with a NULL value instead of being undefined.
The variable remains so that you can give it a proper value to remember later; this is especially important when the variable is an array element or object property. But you must use the function constant("NULL"); to get it's value.At the time He assumed human form, He saved Israel from its sinfulness.Interaction Help About Wikipedia Community portal Recent changes Contact page.This helps give players access to more variety without requiring a large monetary investment if they, for instance, just want to pick a different colored horse.' In a nutshell, the cost of learning to ride a mount and the cost of purchasing a mount have been swapped.