Example of options, note the empty() when using 0/1:
<?php var_dump(isset($_REQUEST['var'])); var_dump(empty($_REQUEST
['var'])); var_dump(array_key_exists('var', $_REQUEST));?>
http://localhost/
bool(false) bool(true) bool(false)
http://localhost/?var
bool(true) bool(true) bool(true)
http://localhost/?var=0
bool(true) bool(true) bool(true)
http://localhost/?var=1
bool(true) bool(false) bool(true)
- Jon
On May 18, 2007, at 10:05 AM, David Krings wrote:
Shadab Wadiwala wrote:
Hi !!
I want to know what's the difference between the functions
----
isset() and empty()
I referred the function reference on php.net, but still
couldn't the exact answer to my query.
isset() checks if a key exists in a server array such as $_SESSION
or $_POST regardless of the value, which can be NULL or an empty
string. I never used empty(), but just by the name of it that
function checks if the value of a given variable or array key is
considered "nothing" for the respective variable type.
I always check if something is set in $_SESSION or $_POST (I rarely
use get) and then go with that value. In case it is not set I
either set a known good default value or I set a value that is
guaranteed to generate an obvious error (means a runtime error,
crash, or such).
David
_______________________________________________
New York PHP Community Talk Mailing List
http://lists.nyphp.org/mailman/listinfo/talk
NYPHPCon 2006 Presentations Online
http://www.nyphpcon.com
Show Your Participation in New York PHP
http://www.nyphp.org/show_participation.php
_______________________________________________
New York PHP Community Talk Mailing List
http://lists.nyphp.org/mailman/listinfo/talk
NYPHPCon 2006 Presentations Online
http://www.nyphpcon.com
Show Your Participation in New York PHP
http://www.nyphp.org/show_participation.php
