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difference between empty, is_null, isset

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Language: PHP
Posted by: Jing Tai Piao
Added: Jun 19, 2013 6:59 AM
Modified: Jun 19, 2013 7:04 AM
Views: 1765
Tags: no tags
  1.          isset  is_null ===null  ==null  empty
  2.  null |   F   |   T   |   T   |   T   |   T   |
  3.  true |   T   |   F   |   F   |   F   |   F   |
  4. false |   T   |   F   |   F   |   T   |   T   |
  5.     0 |   T   |   F   |   F   |   T   |   T   |
  6.     1 |   T   |   F   |   F   |   F   |   F   |
  7.    \0 |   T   |   F   |   F   |   F   |   F   |
  8. unset |   F   |   T   |   T   |   T   |   T   |
  9.   ""  |   T   |   F   |   F   |   T   |   T   |
  10.   []  |   T   |   F   |   F   |   T   |   T   |

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