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The difference between empty and isset in php

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Release： 2016-07-25 09:07:44
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  3. /**

  4. * isset — Check whether a variable is set
  5. * Return true if the variable exists, false otherwise
  6. *
  7. * empty — Check whether a variable is empty
  8. * If the variable is a non-empty or non-zero value, empty() returns false
  9. **/

  10. $is_var = '';

  11. if (isset($is_var)) {

  12. echo "The variable exists!
    ";
  13. } else {
  14. echo "The variable does not exist!
    ";
  15. }

  16. < ;p>if(empty($is_var)) {
  17. echo "The variable is empty!
    ";
  18. } else {
  19. echo "The variable is not empty!
    ";
  20. }
  21. ?>

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Output results: The variable exists! The variable is empty!



Related labels：
php 中 empty 和 isset 的区别
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