What’s the difference between ‘isset()’ and ‘!empty()’ in PHP?

by

ISSET checks the variable to see if it has been set. In other words, it checks to see if the variable is any value except NULL or not assigned a value. ISSET returns TRUE if the variable exists and has a value other than NULL. That means variables assigned a “”, 0, “0”, or FALSE are set, and therefore are TRUE for ISSET.

EMPTY checks to see if a variable is empty. Empty is interpreted as: “” (an empty string), 0 (integer), 0.0 (float)`, “0” (string), NULL, FALSE, array() (an empty array), and “$var;” (a variable declared, but without a value in a class.

For more information, see this article

More Related Contents:

  1. Php if($var) used to work [closed]
  2. Search Form with One or More (Multiple) Parameters
  3. If isset $_POST
  4. Best way to test for a variable’s existence in PHP; isset() is clearly broken
  5. In where shall I use isset() and !empty()
  6. Delete multiple rows by selecting checkboxes using PHP
  7. Using if(isset($_POST[‘submit’])) to not display echo when script is open is not working
  8. PHP Error : Unparenthesized `a ? b : c ? d : e` is deprecated. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` [duplicate]
  9. Calling a particular PHP function on form submit
  10. What is the PHP shorthand for: print var if var exist
  11. PHP: Check if variable exist but also if has a value equal to something
  12. Check if value isset and null
  13. What is the difference between null and empty?
  14. PHP shorthand for isset()? [duplicate]
  15. Simplest PHP File Browser [closed]
  16. What is parameterized query?
  17. PHP: How to handle
  18. PHP Fatal error: Call to undefined function curl_init()
  19. PHP error: Cannot modify header information – headers already sent [duplicate]
  20. How to execute ajax function onbeforeunload?
  21. Can you re-populate file inputs after failed form submission with PHP or JavaScript?
  22. PHP: Calling MySQL Stored Procedure with Both INPUT AND OUTPUT Parameters (NOT “INOUT”)
  23. How to access the form’s ‘name’ variable from PHP
  24. Sort multidimensional array by date column, then use other column values if dates are the same
  25. Get timestamp of today and yesterday in php
  26. php password_verify() hash and pass won’t match
  27. Programmatically determine whether to describe an object with “a” or “an”?
  28. PHP Multiple Curl Requests
  29. How to execute a shell script in PHP?
  30. How to implement a bitmask in php?

Leave a Comment