php - Check if value isset and null -


I have to check that the value is defined as something, including zero. The isset assumes the undefined null and returns as the false example: 

  $ foo = null; If (isset ($ foo)) // return returns if (isset ($ bar)) // return falls if (isset ($ foo) || is_null ($ foo)) // returns true if (isset ($ bar)

Note that $ bar is undefined.

I need to find a condition that satisfies the following: 

  if (some ($ bar)) // wrong; If (some ($ foo)) // returns correct;

Any ideas?

IIRC, you can use it for: 

  $ Foo = NULL; $ Vars = get_defined_vars (); If (array_key_exists ('bar', $ wars)) {}; // should be evaluated at FALSE (array_key_exists ('foo', $ vars)) {}; // should be evaluated to correct

Comments

Post a Comment