The usage of == and === in php

2018-06-20 20:23:13

Possible Duplicate:
What does “===” mean?

I am confused with the use of those operators in php, I am not quite sure when should I use === and when ==.

for example why/when should I write:

if( $some_method_that_returns_something_or_false() === FALSE) {
      //do stuff
}

and when with ==?

Also, does === means I must return bool FALSE or I can return 0? When it is considered an bad practice to use === or ==?

Also when putting something like this:

 if($some_method_that_returns_true_or_false()) {

 }

is that $some_method_that_returns_true_or_false() == TRUE or some_method_that_returns_true_or_false() === TRUE?

===意味着确切的值，所以对于真实它必须是真实的，而==检查值的含义，所以true也将是'1'或任何字符串的值。

== is used for checking equallity and === is used for checking the equality as well as type.

And

if($some_method_that_returns_true_or_false()) {

}

is checking for $some_method_that_returns_true_or_false() == TRUE

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