1--TEST-- 2Closure 001: Lambda without lexical variables 3--FILE-- 4<?php 5 6$lambda1 = function () { 7 echo "Hello World!\n"; 8}; 9 10$lambda2 = function ($x) { 11 echo "Hello $x!\n"; 12}; 13 14var_dump(is_callable($lambda1)); 15var_dump(is_callable($lambda2)); 16$lambda1(); 17$lambda2("Universe"); 18call_user_func($lambda1); 19call_user_func($lambda2, "Universe"); 20 21echo "Done\n"; 22?> 23--EXPECT-- 24bool(true) 25bool(true) 26Hello World! 27Hello Universe! 28Hello World! 29Hello Universe! 30Done 31