What's the difference between !== and != in PHP? [duplicate]

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php ==开发者_运维问答 vs === operator

What's the difference between !== and != in PHP?

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!== is strict not equal and which does not do type conversion

!= is not equal which does type conversion before checking

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=== AND !== checks if the values compared have the same type (eg: int, string, etc.) and have the same values

While...

== AND != only compares the values

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"1" != 1     // False
"1" !== 1    // True

It's a type thing. !== takes into account the types of its operands, while != does not (the implicit conversion makes the first conditional false).

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== is only true if the values are equal. === is only true if the values and types are equal.

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the triple equal also make sure the two variable are from the same type

1 == `1` // is ok
1 === `1` // is not same.

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Both are comparion operators

• $a !== $b Return TRUE if $a is not equal to $b, or they are not of the same type.
• $a != $b Return TRUE if $a is not equal to $b.