What is the difference between == and === operator.

Question

in PHP ,c++ or Java language

Answer 1

== - unstrict comparison, so it TRIES to change type of values before comparison:
0 == false
"" == false
5 == "5"

=== checks TYPE also, so you will not be able to compare different types of values:
0 === false // No
5 === "5" // Returns false

Answer 2

Depends on the language!

Answer 3

In PHP == is equal operator and returns TRUE if $a is equal to $b after type juggling and === is Identical operator and return TRUE if $a is equal to $b, and they are of the same data type.

Example Usages:

<?php
$a=true ;
$b=1;
// Below condition returns true and prints a and b are equal
if($a==$b){
echo "a and b are equal";
}else{
echo "a and b are not equal";
}
//Below condition returns false and prints a and b are not equal because $a and $b are of different data types.
if($a===$b){
echo "a and b are equal";
}else{
echo "a and b are not equal";
}
?>
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