Double Underscore in PHP?

Question

What does the double underscores in these lines of PHP code mean?

$WPLD_Trans[\'Yes\']=__(\'Yes\',$WPLD_Domain);
$WPLD_Trans[\'No\']=__(\'No\',$WPLD_Domain);         


        

Answer 1

As mentioned it is generally used for translating text between languages but really it is used in the same context as any function call.

testfunction();

is no different then

__();