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Class constants

Class constants are public, and accessible from all scopes.

 
class A
{
    const BAR = "Hello World";
}

echo A::BAR; // Hello World

Class constants can be define as array.

 
class A
{
    const BAR = array(1, 2, 3);
}

print_r(A::BAR); // [1, 2, 3]