{ // HHVM (PHP 5 mode), PHP 4, 5: filter is a constructor // HHVM (PHP 7 mode), PHP 7: filter is a constructor and // E_DEPRECATED is raised // PHP 8: filter is a normal method and is not a constructor; // no E_DEPRECATED is raised function filter() { echo "In Filter PHP 4 style constructor\n"; } } class Mapper { // HHVM (PHP 5 mode), PHP 4, 5: filter is a constructor // HHVM (PHP 7 mode), PHP 7: filter is a constructor and // E_DEPRECATED is raised // PHP 8: filter is a normal method and is not a constructor; // no E_DEPRECATED is raised function mapper() { echo "In Mapper PHP 4 style constructor\n"; } } $f = new Filter(); // calls the PHP 4 style constructor $f->filter(); // calls the method filter, which is also the PHP4 style ctor $m = new Mapper(); // calls the PHP 4 style constructor $m->mapper(); // calls the method mapper, which is also the PHP4 style ctor