1 2======================== 3Expression: 1 4Object is a number : 1 5 6======================== 7Expression: 1+2 8Object is a number : 3 9 10======================== 11Expression: 2*3 12Object is a number : 6 13 14======================== 15Expression: 1+2*3+4 16Object is a number : 11 17 18======================== 19Expression: (1+2)*(3+4) 20Object is a number : 21 21 22======================== 23Expression: 1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1+1*1 24Object is a number : 21 25 26======================== 27Expression: 0.000000000000000000000000000000000000000000000000001 28Object is a number : 1e-51 29 30======================== 31Expression: -0.000000000000000000000000000000000000000000000000001 32Object is a number : -1e-51 33 34======================== 35Expression: 1e2147483648 36Object is a number : Infinity 37 38======================== 39Expression: 1e4294967296 40Object is a number : Infinity 41 42======================== 43Expression: 1e9223372036854775808 44Object is a number : Infinity 45 46======================== 47Expression: 1e18446744073709551616 48Object is a number : Infinity 49 50======================== 51Expression: 1e-2147483649 52Object is a number : 0 53 54======================== 55Expression: 1e-4294967296 56Object is a number : 0 57 58======================== 59Expression: 1e-9223372036854775809 60Object is a number : 0 61 62======================== 63Expression: 1e-18446744073709551616 64Object is a number : 0 65 66======================== 67Expression: self::-name 68Object is empty (NULL) 69