Comments on: The Triple Equals in PHP

By: Eric

Eric — Thu, 14 May 2009 06:19:41 +0000

PHP does have some unique features and syntax. Another one of PHP’s unique features I think is interesting is variable variables, where the name of a variable can be variable:

$a = “name”;
$$a = “Bob”;

In this example, the name of the variable $$a is “name”.

By: chris

chris — Tue, 07 Apr 2009 10:29:57 +0000

if(!$result) { …. }

By: hazed

hazed — Tue, 10 Feb 2009 14:50:08 +0000

Well explained. I always wandered the difference between == and === myself and it can be so hard to search Google for the answer (the equal sign isn’t searchable).

I’ll be using this from now on to ensure that all comparisons are the same variable type.

Thanks.

By: Linda

Linda — Tue, 16 Sep 2008 23:15:41 +0000

PHP and Javascript are not strict on variable types.

If you follow a programming practice – always to ensure that a comparison is between two variables of the same type, you really do not have to use the === sign at all.

http://www.gbandtb.com/

By: charles Himmer

charles Himmer — Tue, 26 Aug 2008 02:54:20 +0000

Javascript also uses this syntax.

By: Global Nerdy » Blog Archive » In PHP, There’s Equality, and Then There’s EQUALITY

Thu, 13 Dec 2007 03:07:58 +0000

[...] JonLee.ca: The Triple Equals in PHP [...]

By: rimbaud

rimbaud — Tue, 15 May 2007 14:16:12 +0000

Thanks for the clear explanation

By: maurizio

maurizio — Sat, 12 May 2007 15:38:39 +0000

Well.. I can see at least an example where I don’t need the result (for example my Alexa script).. but I imagine 1000s example where I need it

By: Jon Lee

Jon Lee — Sat, 12 May 2007 14:33:08 +0000

That’s a very good example… I would shorten it to something like this:
if (strpos(”abc”,”d”) === false)
echo “blah”;

Assuming you don’t need $result somewhere else later… which you probably do, nevermind haha.

By: maurizio

maurizio — Sat, 12 May 2007 10:05:13 +0000

I started to use === when I had to improve my script that uses strpos.

$result = strpos(”abc”,”d”);
doesn’t find “d” in “abc”, so it return false

if ($result === false)
echo “blah”;

You can’t use == here, because false is 0, so if you look for “a” on the previous string, the result is 0 and the if statement (if $result == false) is true.

I hope you understand me.