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<?php // wp-includes/functions.php:L6630 $overloaded = function_exists( 'mb_internal_encoding' ) && ( ini_get( 'mbstring.func_overload' ) & 2 ); var_dump($overloaded); $overloaded = function_exists( 'mb_internal_encoding' ) && ( ini_get( 'dont_exist' ) & 2 ); var_dump($overloaded); // wp-includes/pomo/streams.php:L21 $overloaded = ( ( ini_get( 'mbstring.func_overload' ) & 2 ) != 0 ) && function_exists( 'mb_substr' ); var_dump($overloaded); $overloaded = ( ( ini_get( 'dont_exist' ) & 2 ) != 0 ) && function_exists( 'mb_substr' ); var_dump($overloaded);