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PHP PHP Basics (Retired) PHP Operators PHP Operators

John Hartney
John Hartney
2,893 Points
Posted by John Hartney
John Hartney
2,893 Points

I dont get this, am I missing somthing? 

           var_dump( $a == $b); // equal
var_dump( $a == $d); // identical
var_dump( $a != $b); // not equal
 var_dump( $a !== $b); // not identical

I am getting false no matter what I chose

alt text

3 Answers

Hugo Paz
Hugo Paz
15,622 Points
Hugo Paz
Hugo Paz
15,622 Points

Hi John,

Identical uses triple equal signs ===

I you look at your examples, non identical is not the same as non equal, it has an extra equal. You should update your example so identical uses triple equals.

John Hartney
John Hartney
2,893 Points
John Hartney
John Hartney
2,893 Points

Thanks Hugo,

my new glasses are causing me to make so many mistakes and resizing the treehouse videos is less than perfect, anyone got a spare set of eyes going cheap? lol

David Tonge
PLUS
David Tonge
Courses Plus Student 45,640 Points
David Tonge
David Tonge
Courses Plus Student 45,640 Points

=== comparison operator is for something being identical. It's called a strict equality operator.

Example:

"Hello" == "HEllo" ... is true but "Hello" === HEllo" is false

John Hartney
John Hartney
2,893 Points
John Hartney
John Hartney
2,893 Points

Hay dave,

gave "Best Answer" to Hugo he was the first but I appreciate you example, thanks a bunch. : )

David Tonge
David Tonge
Courses Plus Student 45,640 Points

No prob.

Stephen Van Delinder
Stephen Van Delinder
21,457 Points
Stephen Van Delinder
Stephen Van Delinder
21,457 Points

Hugo is exactly right,

== means equal === means identical

This is due to typecasting in PHP. Identity comparisons (===) ensure that equal values are of the same type. Equality comparisons (==) just tests value.

For example:
0 == FALSE would resolve to true because FALSE is the boolean equivalent value to integer 0.

Conversely: 0 === FALSE would resolve to false because integers are not identical to boolean values.

Hope that helps.

John Hartney
John Hartney
2,893 Points
John Hartney
John Hartney
2,893 Points

That makes a lot of sense & thanks to all...

I wish I could get this kind of help with this post, I paused my account as I could not work out why the Carousel is not working and my wife needs this site for her e-portfolio