Comments on: Triple Equal Operator and NULL in PHP http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/ Waiting for your comments Fri, 03 Sep 2010 11:56:21 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: dimuthu http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-708 dimuthu Tue, 04 Nov 2008 03:41:20 +0000 http://www.dimuthu.org/?p=564#comment-708 Thanks @Gromitt, That summarize the whole story. Thanks @Gromitt,
That summarize the whole story.

]]> By: Gromitt http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-707 Gromitt Tue, 04 Nov 2008 03:35:27 +0000 http://www.dimuthu.org/?p=564#comment-707 Here is the global idea : === : IF "types are the same", THEN IF "values are the same", THEN return TRUE. == : IF "types are not the same", THEN re-cast "right-hand operator" into the same type as "left-hand operator", THEN IF "values are the same", THEN return TRUE. Here is the global idea :

=== : IF “types are the same”, THEN IF “values are the same”, THEN return TRUE.

== : IF “types are not the same”, THEN re-cast “right-hand operator” into the same type as “left-hand operator”, THEN IF “values are the same”, THEN return TRUE.

]]> By: dimuthu http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-691 dimuthu Mon, 03 Nov 2008 14:10:52 +0000 http://www.dimuthu.org/?p=564#comment-691 Hi Ivan, Amazingly you are right. I did a simple loop with 1000000 comparisons for both '==' and '===' with both simple types and class instances. '===' was the faster. Should digg in to the c code to see what s really happening there. Thanks Dimuthu Hi Ivan,
Amazingly you are right. I did a simple loop with 1000000 comparisons for both ‘==’ and ‘===’ with both simple types and class instances. ‘===’ was the faster. Should digg in to the c code to see what s really happening there.

Thanks
Dimuthu

]]> By: dimuthu http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-689 dimuthu Mon, 03 Nov 2008 13:53:57 +0000 http://www.dimuthu.org/?p=564#comment-689 Hi Ivan, I haven't check the execution time of '=='. I feel it is anyway speeder than '===' because it doesn't compare the type. Anyway Should do a test and confirm. Thanks Dimuthu Hi Ivan,
I haven’t check the execution time of ‘==’. I feel it is anyway speeder than ‘===’ because it doesn’t compare the type. Anyway Should do a test and confirm.

Thanks
Dimuthu

]]> By: Ivan http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-688 Ivan Mon, 03 Nov 2008 13:31:23 +0000 http://www.dimuthu.org/?p=564#comment-688 Never use '=='! It doesn't compare data type and it's slower! Never use ‘==’! It doesn’t compare data type and it’s slower!

]]> By: dimuthu http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-665 dimuthu Sun, 02 Nov 2008 06:56:46 +0000 http://www.dimuthu.org/?p=564#comment-665 Hi Rubayeet, I agree with you. Simply you have to use === and == according to the application. In fact there can be situation you don't really care about types (say you expect either string '2' or 2). In these situation you will be using '=='. Hi Rubayeet,
I agree with you. Simply you have to use === and == according to the application. In fact there can be situation you don’t really care about types (say you expect either string ’2′ or 2). In these situation you will be using ‘==’.

]]> By: Rubayeet http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-664 Rubayeet Sun, 02 Nov 2008 06:41:59 +0000 http://www.dimuthu.org/?p=564#comment-664 '===' is known as 'Strict Comparison Operator'. It checks both the values and types of its operands. It is considered a good practice to use it instead of '=='. You may take a look at this post: http://rubayeet.wordpress.com/2008/04/29/a-simple-php-gotcha/ ‘===’ is known as ‘Strict Comparison Operator’. It checks both the values and types of its operands. It is considered a good practice to use it instead of ‘==’. You may take a look at this post:

http://rubayeet.wordpress.com/2008/04/29/a-simple-php-gotcha/

]]> By: dimuthu http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-660 dimuthu Sun, 02 Nov 2008 03:45:30 +0000 http://www.dimuthu.org/?p=564#comment-660 yea. the is_null($foo) do the same job as $foo === NULL. Thanks for raising that. yea. the is_null($foo) do the same job as $foo === NULL. Thanks for raising that.

]]> By: Gromitt http://www.dimuthu.org/blog/2008/10/31/triple-equal-operator-and-null-in-php/comment-page-1/#comment-659 Gromitt Sun, 02 Nov 2008 03:10:05 +0000 http://www.dimuthu.org/?p=564#comment-659 For NULL comparisons, prefer the is_null($foo) built-in PHP function which makes probably more sense, as "NULL" is not really a value (nor a type), but the "absence of a value". For NULL comparisons, prefer the is_null($foo) built-in PHP function which makes probably more sense, as “NULL” is not really a value (nor a type), but the “absence of a value”.

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