Empty function of PHP, some more information

The empty function, native to the PHP programming language, is useful for checking if a certain pass-through value is empty or not.

For example, if I want to check if the data passed from a form is empty I can write:

if (! empty ($ _ POST [ 'miovalore']))
  //Do this
else
  // do something else

however, there is an important consideration that sometimes can escape (not for another write this article laugh), if for example in the form I have the numerical value 5 and I want to overwrite it with the value number 0, I could not get the expected result because the language PHP programming considers empty the following values:

    "" (an empty string)
    0 (0 as an integer)
    0.0 (0 as a float)
    "0" (0 as a string)
    NULL
    FALSE
    array () (an empty array)

therefore in certain operations (not always) I could not execute specific commands because the value 0 (zero) being considered empty does not allow me to enter a specific condition.

I hope I have been helpful.