3 different equals

Question

What is the difference between

=, ==, ===?

I think using one equal sign is to declare a variable, two equal signs are used to compare conditions, and the last three equal signs are used to compare the value of the declared variable.

Answer 1

• = is the assignment operator
• <代码>== is a comparison operator (checks if Both variables have the same value)
• === is the same comparison operator (checks whether two variables have the same value and are the same type).

Answer 2

You have = assignment operator , == "equals" comparison operator and === "Same" comparison operator.

$a = $b Assign Sets $a to be equal to $b.
$a == $b Equal TRUE if $a is equal to $b.
$a === $b Identical TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4)

For more information on the necessity of == and === and their respective usage, see Documentation.