Expression values
For example if $x=""; what will empty($x) return? or is_null($x)? Or the even more surprising one: $x = "0" will return TRUE on empty() even though it is considered a string.
2 Responses to “Expression values”
Categories
- Admin-type scripts
- Announcements
- babble
- bookmarklets
- Bookmarks
- Call for help
- complaint department
- CSS
- cubecart
- Flash
- How to's
- htaccess tricks
- Internet Explorer
- Javascript
- Lessons learned
- Movable Type
- mySQL
- Outlook
- Photoshop Tutorial
- PHP
- pMachine
- product review
- Projects
- Scripts
- shopping cart
- Suggested reading
- WordPress
Archives
- November 2008
- October 2008
- September 2008
- August 2008
- July 2008
- June 2008
- May 2008
- March 2008
- February 2008
- January 2008
- December 2007
- November 2007
- October 2007
- September 2007
- August 2007
- July 2007
- June 2007
- May 2007
- April 2007
- March 2007
- February 2007
- January 2007
- December 2006
- November 2005
- August 2005
- June 2005
- May 2005
- April 2005
- March 2005
- February 2005
- January 2005
- December 2004
- November 2004
- October 2004
- September 2004
- August 2004
- July 2004
- June 2004
- May 2004
- April 2004
- March 2004
- February 2004
- January 2004
- December 2003
- November 2003
- October 2003
- September 2003
- August 2003
- July 2003
- June 2003
- May 2003
- April 2003
- March 2003
- February 2003
- January 2003
- December 2002
- November 2002
- October 2002
- September 2002
- August 2002
- July 2002
- June 2002
- May 2002
- April 2002
September 22nd, 2004 at 7:59 pm
Very tricky stuff… don't even get me started on the triple equals… if ($x === 1)
September 23rd, 2004 at 6:28 pm
This is why empty() blows and why it should be avoided.
(And why checking the data type is most usually a good idea if you need accurate results!)