Question

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php == vs === operator
Is there a difference between !== and != in PHP?

In PHP, the condition of the if command contains operator === and !==.

I never use them. So I wonder when will we actually need to call them?

E.g.

if (FALSE !=  someMethod() ) {
}

if (FALSE !== someMethod() ) {
}

What may go wrong with the 1st if?

Answer 1

0 == '' == null == false == array()

If you need to know the difference between two of these, you need ===.

http://php.net/manual/en/function.strpos.php

int strpos ( string $haystack , mixed $needle [, int $offset = 0 ] )

strpos('apple', 'a') == 0

strpos('apple', 'b') == false

Without a === you won’t know if ‘apple’ has ‘a’ in the first position or if it doesn’t exist.