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Possible Duplicate:
How do the equality (== double equals) and identity (=== triple equals) comparison operators differ? 

if (filter_input(INPUT_GET, "email", FILTER_VALIDATE_EMAIL) === 0)

or

if (filter_input(INPUT_GET, "email", FILTER_VALIDATE_EMAIL) == 0)

Should I use == or === here?

Where can I use ===?

Community
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makcbn
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3 Answers3

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=== is used to make a strict comparison, that is, compare if the values are equal and of the same type.

Look at @Ergec's answer for an example.

In your case you should do just:

if (filter_input(INPUT_GET, "email", FILTER_VALIDATE_EMAIL) == false)

or simply

if (filter_input(INPUT_GET, "email", FILTER_VALIDATE_EMAIL))

because filter_input() returns:

Value of the requested variable on success, FALSE if the filter fails, or NULL if the variable_name variable is not set. If the flag FILTER_NULL_ON_FAILURE is used, it returns FALSE if the variable is not set and NULL if the filter fails.

Shef
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In PHP double equals matches only VALUE

if (2 == "2") this returns TRUE

Triple equals matches VALUE AND TYPE

if (2 === "2") this returns FALSE
Ergec
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You are looking for !== FALSE in that case.

filter_input will either return the filtered variable or FALSE.

=== checks if both sides are equal and of the same type.

!== checks if both sides are not equal and of the same type.

Cobra_Fast
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  • Caution: if `!== FALSE` is used, the filter will pass if the variable is not set. – Shef Jul 13 '11 at 13:34
  • About "*`!==` checks if both sides are **not** equal and of the same type.*" phrase - it should be written as "*`!==` checks if both sides are **not** equal **or** of the same type.*" – binaryLV Jul 13 '11 at 13:45
  • @binaryLV it's correct the way I wrote it. – Cobra_Fast Jul 15 '11 at 09:11