Differences between double equations and triple equations

[terryds]

Do you know the difference between double and triple equation ?

 

I'm so confused... I often see triple equations in some functions ( like if (md5($a)===1) ) and others....

[niche]

They're comparison operators

 

http://www.w3schools.com/php/php_operators.asp

[astralaaron]

http://www.w3schools.com/php/showphp.asp?filename=demo_operator_comparison

[thescientist]

• == will not do type casting, so 2 == "2" would be true.
• === will check for type, so 2 === "2" would be false.

 

It is always best practice, IMO, to use ===, to make sure both the value and type of both sides are actually the same.

Edited September 9, 2013 by thescientist

[Ingolme]

 

• == will not do type casting, so 2 == "2" would be true.
• === will check for type, so 2 === "2" would be false.

 

It is always best practice, IMO, to use ===, to make sure both the value and type of both sides are actually the same.

 

 

Personally, I don't use === unless the type is strictly important in the comparison (functions that can return both 0 and false with different meanings). Using == can simplify things, like not having to type cast a variable before comparing it. You know all $_POST, $_GET and $_COOKIE values are strings, so when you want to compare them to a number it's simpler to use == than to cast them.