WEBVTT 00:00.440 --> 00:03.530 I will call you back again to add a video lecture in PHP. 00:03.530 --> 00:09.920 And in this video lecture we go ahead and look at switch statement in PHP. 00:16.610 --> 00:24.440 So switch statement is another type of decision making statement in PHP that is used to compare one 00:24.440 --> 00:28.430 value with bunch of other values in your program. 00:28.430 --> 00:32.270 So you can have so many switch cases. 00:32.270 --> 00:38.060 And in some statements it uses these two keywords switch and cases. 00:38.060 --> 00:39.200 We add a switch. 00:39.200 --> 00:48.590 We actually do the job of uh showing you the, the variable. 00:48.920 --> 00:50.750 And then the case. 00:50.750 --> 00:55.430 We actually give you the values which are going to compare. 00:55.430 --> 00:57.410 So you have the switch. 00:57.440 --> 00:59.840 Then you have so many cases to compare. 00:59.840 --> 01:06.950 So once you set the variable inside the switch, then you go ahead and begin to compare different different 01:06.950 --> 01:07.400 cases. 01:07.400 --> 01:13.340 So you won't have case one, case two three, four to as many possible cases as you want. 01:13.370 --> 01:15.890 Now let me go ahead and use maybe the football. 01:15.920 --> 01:23.210 Maybe if we insert remove and it's going to say uh escort that goes under or let's go ahead and use 01:23.210 --> 01:27.320 something very simple and very, uh, unique like the students grid. 01:27.320 --> 01:29.720 So first of all, I'll create a form for this. 01:29.750 --> 01:31.280 We want to say form. 01:31.280 --> 01:34.580 And then we go ahead and close this. 01:34.580 --> 01:39.020 And then let's go ahead and uh, put in action. 01:39.020 --> 01:42.800 And that is going to be site that PHP. 01:42.920 --> 01:48.110 And then we'll go ahead and say mytouch and let the method be post method. 01:48.110 --> 01:50.930 And then we go ahead and create a form. 01:50.930 --> 01:58.670 And let the form we create is going to be a form that's going to ask students for their grid to understand. 01:58.850 --> 01:59.810 what I'm going to say? 02:01.070 --> 02:02.420 In such great. 02:05.390 --> 02:06.080 So. 02:06.080 --> 02:06.950 In such great. 02:06.950 --> 02:16.100 And then go ahead and put the grid so inputs and the, the type of the input is going to be just text. 02:17.510 --> 02:25.940 So and let the method which are going to use here is okay I might say method let name. 02:25.940 --> 02:30.500 So let name be equal to grid. 02:30.890 --> 02:31.430 All right. 02:31.430 --> 02:33.350 So go ahead and close this. 02:33.350 --> 02:37.190 And let's go ahead and impute our submit button. 02:37.190 --> 02:43.940 So input type and the input type be submit. 02:44.330 --> 02:44.750 All right. 02:44.750 --> 02:46.850 So I'm trying to write submit. 02:47.720 --> 02:49.430 Now go ahead and close this. 02:49.430 --> 02:52.430 And if we go on go ahead and refresh this. 02:52.460 --> 02:54.470 We have our inset grid. 02:54.470 --> 02:57.140 And then go ahead and submit that. 02:57.350 --> 02:58.550 So I hope that is good. 02:58.550 --> 03:01.310 So let's go ahead and just put in Greek. 03:01.340 --> 03:03.380 I just want this to be short. 03:03.380 --> 03:04.610 So go ahead and save. 03:04.640 --> 03:05.270 Great. 03:05.270 --> 03:06.890 And save this and refresh. 03:06.890 --> 03:08.330 We have great input. 03:08.330 --> 03:08.660 Great. 03:08.660 --> 03:10.640 We go ahead and submit that. 03:10.640 --> 03:17.030 Now if I try to go right in here and create move ahead and create a. 03:20.150 --> 03:23.330 A variable and let variable be equal to. 03:23.360 --> 03:29.630 Let me see if we go ahead and see posts. 03:29.870 --> 03:37.100 And then we go ahead and say grid because I think in the grid right in here, go ahead and place semicolon 03:37.100 --> 03:37.850 at the end. 03:37.850 --> 03:40.640 And then we go ahead and execute this. 03:40.640 --> 03:47.240 So we go ahead and echo whatever the user puts in there. 03:47.240 --> 03:50.510 So with semicolon at the end and let's save this. 03:50.510 --> 03:52.220 Now go ahead and refresh this. 03:52.220 --> 03:55.760 And uh this arrow always cool. 03:55.790 --> 04:00.920 Now if you want this error to stall, this is not an error from your computer. 04:00.920 --> 04:02.210 If I go ahead, I click a submit. 04:02.240 --> 04:03.650 This error will actually go out. 04:03.680 --> 04:05.840 You see that if I click on this it goes out. 04:05.870 --> 04:07.400 What if you don't want to do that. 04:07.400 --> 04:10.880 You go ahead and put PHP error or put in. 04:10.910 --> 04:16.130 You understand and let the error button be equal to zero and it will no longer do that. 04:16.130 --> 04:22.400 So let me go ahead and say we have a A and if you submit it's going to print out A. 04:22.430 --> 04:29.120 If you have B it's going to print out B, if you have C it's going to print out C. 04:29.150 --> 04:36.890 Now what to tell you, the user whenever you insert A is going to see you have an A or you have an A 04:37.190 --> 04:37.730 grade. 04:38.690 --> 04:40.850 So how can we be able to do that. 04:41.270 --> 04:45.200 Because these this code and one can not be able to do that for us. 04:45.200 --> 04:49.520 So in order to do that I'm going to remove whatever we have right in here. 04:49.520 --> 04:53.780 And let's go ahead and write a switch statement. 04:53.780 --> 04:58.910 So First of all, I'll go back to paste this. 04:58.940 --> 05:01.160 I'll go ahead and remove the echo. 05:01.190 --> 05:05.420 Then I'm going to put the echo right inside the switch statement I'm going to create. 05:05.420 --> 05:07.670 So go ahead and say switch. 05:07.670 --> 05:13.040 And you see when I click on switch the first one I have is the variable which is this variable here. 05:13.070 --> 05:17.480 Like I told you the variable is the first thing you insert into the switch. 05:17.630 --> 05:19.340 So great. 05:19.370 --> 05:22.250 Now it has created some cases for you. 05:22.250 --> 05:23.510 And then the default. 05:23.540 --> 05:26.150 The default is the last of all days. 05:26.150 --> 05:31.610 So if all the cases are not met then it goes on to print out the default. 05:31.610 --> 05:38.180 So if it fails to get anything from the value from the cases, then it will actually print out the default. 05:38.210 --> 05:39.110 You understand. 05:39.140 --> 05:44.900 Now let's go ahead and see case which is how this case holds the value. 05:44.900 --> 05:48.560 So let me say this is an A you understand. 05:48.560 --> 05:54.920 And it goes on to echo out the migraine and say Echo. 05:54.950 --> 05:58.250 And it's good to see you. 05:58.610 --> 06:02.600 Have you have an. 06:06.020 --> 06:09.920 Excellent grade. 06:09.950 --> 06:10.370 All right. 06:10.370 --> 06:14.060 So anyone that has an A we always have an excellent grade. 06:14.090 --> 06:16.070 Now I'll go ahead and copy this. 06:16.160 --> 06:25.100 So now what it break does is that if it checks a it will actually break out from A and then check B. 06:25.130 --> 06:28.250 And in that way it will check all of them. 06:28.400 --> 06:29.420 Let's go ahead and paste that. 06:29.420 --> 06:32.210 So can you to understand explain that better. 06:32.210 --> 06:34.910 So I inserted another one. 06:36.410 --> 06:44.000 And uh so let's go ahead and insert this one then the next one. 06:46.220 --> 07:01.790 So this is case b and c and c case b and uh, c and uh d now the A says you have an excellent grade. 07:01.820 --> 07:06.350 The B is going to be you have an amazing grade. 07:06.380 --> 07:17.690 The C is going to be you have a good grade then the D is going to be you have a Fe Great Dane. 07:20.360 --> 07:24.710 The E is going to be you have. 07:26.090 --> 07:27.410 Let me say you have a bad grade. 07:28.610 --> 07:29.030 All right. 07:29.060 --> 07:34.220 So the last one is going to be your failed. 07:35.570 --> 07:36.410 So. 07:40.280 --> 07:41.510 You've heard. 07:41.750 --> 07:48.410 So now if it checks all these grades and it didn't get anything. 07:48.440 --> 08:00.740 Now what happens is that it goes to default and it's going to echo, as I say, echo invalid. 08:01.760 --> 08:02.360 Great. 08:02.390 --> 08:03.950 Now let me go ahead and explain all this. 08:03.980 --> 08:06.320 Let me go ahead and explain what we just did right in here. 08:06.380 --> 08:09.890 Now for the switch cases it checks on. 08:09.920 --> 08:18.020 We create a switch and we pass in the variable grid, which gets whatever inputs the user in certain 08:18.020 --> 08:21.560 right inside this, uh, form. 08:21.560 --> 08:26.360 So and then the name is grid and that is what we inserted inside. 08:26.390 --> 08:28.880 Or we save inside this variable called grid. 08:28.880 --> 08:31.520 And now we begin to check the input. 08:31.520 --> 08:34.760 So if a user inserts E we're going to echo out. 08:34.760 --> 08:36.290 You have an excellent grid. 08:36.290 --> 08:41.600 And if we check and the user didn't insert a we break out of this case. 08:41.600 --> 08:46.220 So you can see I added breaks in every one of the cases. 08:46.220 --> 08:52.670 So whenever it checks a case and the case didn't meet up or it will not remain there, it will break 08:52.700 --> 08:54.260 out and move to the next one. 08:54.260 --> 09:02.030 So when it checks all of these cases and it did not meet any one, it goes on and say invalid grid. 09:02.060 --> 09:04.580 Now let's go ahead and save this. 09:04.580 --> 09:07.700 I'm going to refresh this guy on a fresh. 09:07.700 --> 09:10.940 You have an excellent grid because I inserted an A. 09:10.970 --> 09:18.980 So if I put in F and submit invalid because here I select the A right in here. 09:18.980 --> 09:20.450 So I've changed that to F. 09:20.450 --> 09:22.400 And now I will replace this. 09:22.400 --> 09:24.290 And the default. 09:24.320 --> 09:25.070 You see that. 09:25.070 --> 09:29.750 So if I insert e and submit you have a bad grid. 09:29.780 --> 09:39.620 You if you insert a D it says you have, oh this should be a fake grid and not a. 09:39.620 --> 09:39.980 All right. 09:40.010 --> 09:46.070 So I didn't change all these things shall be good amazing and excellent and so on. 09:46.310 --> 09:47.720 Let's go ahead and check it out. 09:47.750 --> 09:57.390 Now let's go ahead and add Z and submit invalid grade, so the grade ranges from A to F, and anything 09:57.420 --> 10:05.160 apart from D is an invalid grade, so you can actually use the if else if statement to do this. 10:05.190 --> 10:14.040 But you can see that this is more shorter, more simple and uh, more clear to developers than the if 10:14.070 --> 10:15.270 else statement. 10:15.270 --> 10:21.330 So this is another form of decision making statement that you can be able to use in the place of if 10:21.360 --> 10:22.110 statements. 10:22.110 --> 10:25.380 And the if statements can hopefully do the same thing. 10:25.380 --> 10:32.670 But we have to learn every one of them because this is more clear and more concise and more clean and 10:32.670 --> 10:35.640 developing such kind of program. 10:35.640 --> 10:37.350 Now go ahead and practice with that. 10:37.350 --> 10:39.150 Check it out and play around with it. 10:39.180 --> 10:42.720 If you have any questions, go ahead and use the question and answer section. 10:42.720 --> 10:45.390 And I'm going to get back to you as soon as possible. 10:45.390 --> 10:46.380 Thank you so much. 10:46.380 --> 10:49.380 And I'm going to see you in the next video lecture.