PHP 0 differs from empty _php tutorial

As a qualified PHP programmer, some basic knowledge is necessary to know, such as the difference between 0 and empty, about this difference, the following through a few examples of simple analysis, in which the truth, imaginative achievement here, inexpressible, the reader can go slowly experience.

 
  In PHP, 0 is empty '; is output}if ($test = = = ") {echo ')
In PHP, 0 is empty '; not be output}if ($test ==null) {echo '
In PHP, 0 is empty '; Output}if ($test ===null) {echo '
In PHP, 0 is empty '; not be output}if ($test ==false) {echo '
In PHP, 0 is empty '; Output}if ($test ===false) {echo '
In PHP, 0 is empty '; not be output}?>

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