WEBVTT 00:00.440 --> 00:03.470 I will call you back again to another video lecture in PHP. 00:03.470 --> 00:09.290 And in this video lecture we go ahead and look at getters and setters. 00:16.010 --> 00:19.850 So getters and setters are very important aspects of PHP development. 00:19.850 --> 00:23.210 And we're going to look at it right in here. 00:23.240 --> 00:28.970 Now I have just modified what we did in the previous lecture because we have talked about cars and we 00:28.970 --> 00:31.580 keep on talking about cars is going to be boring. 00:31.580 --> 00:34.850 And some people will be like, why don't you change to something else? 00:34.850 --> 00:42.320 For us to have a better understanding of what objects and classes and object functions and code mean. 00:42.320 --> 00:49.130 So that's what tool getters and setters have to make some modifications by changing this into another 00:49.130 --> 00:54.200 thing altogether, or using every other thing we've learnt in the previous lectures. 00:54.230 --> 00:57.560 Now we're talking about a rainbow right in here. 00:57.560 --> 01:04.790 And we know that rainbow has seven colors, and these colors can never be modified because it is always 01:04.790 --> 01:05.270 there. 01:05.660 --> 01:08.240 Now we have red in here. 01:08.240 --> 01:09.680 I created a statement. 01:09.680 --> 01:18.290 Rainier has seven colors red, orange, yellow, green, blue, indigo, and violet and these are the 01:18.290 --> 01:19.820 only colors that is here. 01:19.850 --> 01:25.010 But as this program is this program, we can actually modify that. 01:25.040 --> 01:26.540 Let's go ahead and refresh this. 01:26.750 --> 01:29.630 We have red color which is red in here. 01:29.660 --> 01:35.780 Now the next thing I'm going to talk about is the getters and setters. 01:36.290 --> 01:40.850 You can see that I'm using var right in here which is the variable I can actually go ahead and change 01:40.850 --> 01:43.040 this to public. 01:43.910 --> 01:51.170 So if we are using public it means that this is now accessible to the public. 01:51.170 --> 01:53.390 And everybody can make changes to here. 01:53.420 --> 01:58.250 So if I go ahead and refresh this we can see that my code is still working fine. 01:58.250 --> 02:04.690 So I've been using VAR in the previous lectures and I can actually use public day, but I left that 02:04.690 --> 02:07.720 so we can talk about it in this lecture. 02:07.780 --> 02:13.480 Now you can see I have public and making this accessible to every kind of person out there. 02:13.480 --> 02:22.000 It means that someone can come back and go over here and tell that the color of this has been modified 02:22.000 --> 02:28.210 by injecting some things into this code, you can say that this is equal to. 02:28.930 --> 02:30.010 It creates another. 02:30.970 --> 02:38.260 The variable symbol is known as hyphen greater than color. 02:38.890 --> 02:46.180 And the person can actually change these and say that we have block in symbol. 02:46.450 --> 02:49.450 And now if we go ahead and run this code check it out. 02:49.450 --> 02:53.110 You can see that we have black and you'll be like wow, nuts. 02:53.110 --> 02:54.550 This is not true. 02:54.580 --> 03:00.580 The reason is because someone can actually assess this and that. 03:00.580 --> 03:08.230 Because the person can assess this, he or she can actually modify our code and be able to put in things 03:08.230 --> 03:09.460 that we don't want. 03:09.490 --> 03:17.590 So how do we limit this in order to make sure that only what we want is actually printed out? 03:17.620 --> 03:22.600 Maybe you are in optimization and you have some things that can never be changed. 03:22.600 --> 03:28.630 And if those things cannot be changed, that is when this lecture will be very more interesting to you. 03:28.660 --> 03:34.600 Now, if you want to do that, I will go over to Carlo and I'm going to remove this public. 03:34.630 --> 03:36.610 I'm going to make it to be private. 03:36.640 --> 03:37.150 What? 03:37.150 --> 03:38.170 That is not all. 03:38.170 --> 03:39.580 I'm going to save this right now. 03:39.580 --> 03:46.270 And because I have modified this to black, I remember we have this rainbow with this object is created, 03:46.270 --> 03:48.310 we pass in rainbow right in here. 03:48.310 --> 03:53.710 And this one is the name I made the name of the rainbow to be the acronym of the colors. 03:53.740 --> 04:01.960 Now, if I refresh this, we have a fatal error and what this error said cannot assess private property. 04:01.990 --> 04:07.720 Rambo, you see, that cannot assess private property. 04:07.750 --> 04:08.320 Rambo. 04:08.320 --> 04:12.340 And this error is thrown at line 21. 04:12.340 --> 04:19.180 And that line 21 is this guy here which is trying to modify the color of Rambo. 04:19.210 --> 04:28.390 So in the color of Rambo, you cannot select red, orange, yellow, green, blue, indigo, violet. 04:28.390 --> 04:32.980 So this is where getters and setters play a very vital role. 04:32.980 --> 04:40.720 And now let's quickly dive into setters and getters and learn how it can be able to lock this. 04:40.720 --> 04:47.680 Why we carry out our program and no one can be able to actually alter this. 04:47.710 --> 04:50.710 And as such, anything that is not needed into this. 04:50.710 --> 04:52.600 So let's go ahead and kick off immediately. 04:53.350 --> 05:01.230 So setters actually help us to set the attributes of a class, while guitar helps us to get the attributes 05:01.230 --> 05:01.980 of a class. 05:01.980 --> 05:04.500 So that is what I wanted to have in mind. 05:04.500 --> 05:08.220 So you can write it down and always refer to it. 05:08.220 --> 05:15.060 Always does help you to set the attribute of a class, while guitar helps you to set to get the attribute 05:15.090 --> 05:15.720 of a class. 05:15.720 --> 05:17.670 Why one sets the other one gets it. 05:17.700 --> 05:25.470 Now, because we can be able to access private property of this class, which we have been able to change 05:25.470 --> 05:26.100 to private. 05:26.130 --> 05:30.390 Now, what we are going to do is let's go over here and create a function. 05:30.570 --> 05:35.580 So I'm going to create a function and I'm going to call it out to be get column. 05:35.580 --> 05:39.540 So that is get color and the score head. 05:39.540 --> 05:48.570 And what I'm going to do right in here is to return this because we can no longer get the color down 05:48.570 --> 05:49.080 there. 05:49.950 --> 05:51.510 So return. 05:51.510 --> 05:56.520 And I'm going to use this method This. 05:56.550 --> 06:05.250 So whatever you use this, you go ahead and return the color, which is the color of this private glass 06:05.250 --> 06:07.320 right in the app, because that is what we need. 06:07.320 --> 06:09.420 So go ahead and copy this and paste it here. 06:09.600 --> 06:12.900 And remember to put a semicolon at the end of this. 06:12.900 --> 06:16.380 And now we have to do this. 06:16.410 --> 06:19.800 I'll go right in here and remove this block we put in here. 06:19.800 --> 06:24.300 And that is one out of four we are going to do. 06:24.300 --> 06:25.080 So. 06:25.080 --> 06:27.540 I cannot be able to access this guy here on fresh. 06:27.540 --> 06:30.060 And I still have this arrow right in here. 06:30.090 --> 06:37.710 Now instead of me saying echo removal equal to color, what I'm going to do now is I'm go ahead and 06:37.890 --> 06:40.290 replace this with a get color. 06:40.290 --> 06:44.430 So which is the function we just created up there. 06:44.640 --> 06:45.810 Get color. 06:49.020 --> 06:49.350 All right. 06:49.380 --> 06:50.820 Now go ahead and save this. 06:50.820 --> 06:52.800 And let's go ahead and refresh this. 06:52.800 --> 06:55.660 And you can see we have a right right in the A. 06:56.170 --> 06:56.740 All right. 06:56.740 --> 07:00.370 So that is not all because we are going to set this. 07:00.400 --> 07:04.450 We just well I just want to show you how to use the getter. 07:04.480 --> 07:10.420 Then we go ahead and do the setup because someone can actually still actually assess this board. 07:10.420 --> 07:13.690 Not at all anymore like we did before. 07:13.720 --> 07:19.570 We're going to set it right in there inside this class so that it will be permanent. 07:19.570 --> 07:26.620 And the only the colors you can actually put is either red, orange, yellow, green, blue, indigo 07:26.620 --> 07:27.250 and violet. 07:27.250 --> 07:33.790 So you have to specify these seven colors inside a class function inside a class rainbow, so that it 07:33.790 --> 07:36.550 will always be permanent and nobody will actually go there. 07:36.610 --> 07:37.510 Risk pregnancy. 07:37.540 --> 07:41.650 We have a um, green. 07:41.650 --> 07:45.070 And if we go ahead and save this refresh and have green. 07:45.070 --> 07:54.660 Now what if someone goes in there and say we have black and save this black is there if yesterday's 07:54.660 --> 07:56.160 because of not set the color. 07:56.160 --> 07:57.120 So we need to set it. 07:57.120 --> 08:01.530 But we are currently using the gate because we're actually using the Get method. 08:01.560 --> 08:04.770 Just set the private property of this class. 08:05.160 --> 08:11.970 So now let's go ahead and talk about the gates the set function. 08:12.000 --> 08:12.750 All right. 08:13.380 --> 08:16.260 So now let's go ahead and create another function. 08:16.260 --> 08:20.760 And let that function name be equal to. 08:21.090 --> 08:25.620 Let's call that to be set color. 08:26.640 --> 08:28.200 So that is set color. 08:28.200 --> 08:31.950 And let's go ahead and put a curly brace right in here. 08:31.950 --> 08:34.740 And now this set call is going to take an actual box. 08:34.740 --> 08:36.420 And that is going to be one attribute. 08:36.420 --> 08:38.970 And that is the attribute of color. 08:38.970 --> 08:43.170 So go ahead and copy this and paste in there. 08:43.200 --> 08:45.870 Because we just need only one color right in there. 08:45.900 --> 08:52.260 The are going to be two so equals or we are always going to check between the seven colors of the rainbow. 08:52.260 --> 08:52.280 Ramble. 08:52.310 --> 08:52.820 All right. 08:52.850 --> 08:54.140 Now let's go ahead and see. 08:54.170 --> 08:55.550 We have this right in here. 08:55.550 --> 09:06.980 And what if we go ahead and say this and let this be equal to equal to color. 09:06.980 --> 09:13.700 And then we go ahead and say this is equal to. 09:15.770 --> 09:19.040 According to the color which we just copied in our score here. 09:19.040 --> 09:20.990 And put equal right in here. 09:20.990 --> 09:26.870 And then let's go down here and say that we want to modify that color outside. 09:26.870 --> 09:28.220 Yes, if it still work. 09:28.220 --> 09:31.580 But I'm going to show you step by step the way we're going to lock this. 09:31.580 --> 09:32.990 So I won't show you this. 09:33.020 --> 09:34.970 Then I'll go back and lock it again. 09:35.000 --> 09:48.080 Now, if I should go ahead and, uh, say, uh, color and, uh, let's the color, I mean, return, 09:48.410 --> 09:51.680 uh, Sets. 09:52.430 --> 09:53.750 Sets color function. 09:53.750 --> 09:58.280 Some will call this and I'm going to pass in a parameter. 09:58.310 --> 10:01.700 Then go ahead and say this is equal to. 10:04.010 --> 10:05.390 Equal to red. 10:05.540 --> 10:07.940 And then go ahead and put a semicolon at the end. 10:07.940 --> 10:16.370 And let's go ahead and refresh this and check what it says on the five variable color and line 29. 10:16.640 --> 10:20.540 And uh let's see what happens right in here. 10:23.000 --> 10:23.420 All right. 10:23.450 --> 10:29.930 So now we have been able to set up the gate color and we can actually get the color. 10:29.960 --> 10:35.480 Let's go ahead and set the color and make sure that we lock just the colors of the rainbow right in 10:35.510 --> 10:35.750 there. 10:35.750 --> 10:40.550 So let's go ahead and create a function called set color. 10:41.690 --> 10:45.920 And now this set color is going to take a one attribute. 10:45.920 --> 10:48.770 And that attribute is the color attribute. 10:48.770 --> 10:53.270 So let's go ahead and copy this because this is a private class. 10:53.300 --> 10:58.490 Now let's go ahead and pass in this private column right in here. 10:58.490 --> 11:01.910 So now we have passed in column right in here. 11:01.910 --> 11:04.310 And then the variable color is right in there. 11:04.340 --> 11:10.040 What we need to do now is we have to set this color to the number of the colors we want, so that only 11:10.040 --> 11:13.790 the colors we specify right inside this function will be printed out. 11:13.790 --> 11:23.570 So let's go ahead and see that if this is going to see if and then you go ahead and say if color. 11:25.520 --> 11:29.870 If color is equivalent to then you give the name of the color. 11:29.870 --> 11:35.120 And down here I have red if it is equal to red. 11:35.150 --> 11:37.280 And because I have like about seven colors. 11:37.280 --> 11:41.840 So we're going to use the, all the, all uh operator for this. 11:41.840 --> 11:43.310 So the or operator you go. 11:43.340 --> 11:50.410 We actually have to check and know if we meet this color or this color or this color or under color. 11:50.440 --> 12:01.300 Okay, so if color is equal to red or color is equal to, the next one is orange. 12:03.580 --> 12:06.820 Then okay. 12:06.850 --> 12:07.390 Um. 12:09.790 --> 12:17.200 Next one is orange or the next one is, uh. 12:19.450 --> 12:20.050 Yellow. 12:24.880 --> 12:25.510 Or. 12:28.030 --> 12:32.980 Color is equal to green. 12:40.030 --> 12:41.230 Oh, color. 12:44.590 --> 12:46.060 Is ecotourism. 12:46.090 --> 12:47.140 Let's go ahead and drag this. 12:47.170 --> 12:51.070 I'm gonna shift this a little bit so that I'm able to see what I'm doing. 12:51.100 --> 12:55.120 We have our blue, we have blue. 13:00.910 --> 13:04.750 So I will move this down so that it's kind of consistent from here. 13:07.810 --> 13:08.710 Or color. 13:12.880 --> 13:14.200 Okay I copied that. 13:14.200 --> 13:19.300 So let me go ahead and copy this again so I can actually paste this. 13:24.280 --> 13:26.560 A color is equal to. 13:28.750 --> 13:29.830 Indigo. 13:36.130 --> 13:38.680 How color is equal to. 13:41.710 --> 13:42.460 Violet. 13:42.460 --> 13:44.470 So we have these colors. 13:44.470 --> 13:47.050 We have set up these colors right now. 13:47.050 --> 13:48.850 And I hope that is cool. 13:48.850 --> 13:51.310 So go ahead and set the colors. 13:51.310 --> 13:55.840 And if you set all these colors I'll go ahead and move this down. 13:55.840 --> 13:56.770 So that's a. 13:59.350 --> 13:59.950 Okay. 13:59.950 --> 14:04.480 So now I'll go ahead and put this here. 14:04.480 --> 14:10.000 So if the color is equal to red or color is equal to orange or color is equal to yellow or color is 14:10.000 --> 14:15.010 equal to green or color is equal to blue or color is equal to indigo or violet. 14:15.010 --> 14:19.090 So among all these we're going to see. 14:21.250 --> 14:22.390 This. 14:23.590 --> 14:27.850 And then we go ahead and pass in color. 14:28.300 --> 14:30.040 And I want to see that. 14:32.830 --> 14:33.280 Okay. 14:33.310 --> 14:35.800 So let's go ahead and move this I think there's a mistake. 14:35.800 --> 14:40.810 But let's say color is equal to this color. 14:41.380 --> 14:49.050 So the color is equal to one of these colors because that is, the parameter will pass in there, and 14:49.080 --> 14:52.830 we assign each of these colors to one to them. 14:52.830 --> 15:01.530 So we assign orange to the color variable, and we assign this to the coral variable or coral attributes. 15:01.560 --> 15:02.190 Okay. 15:02.220 --> 15:07.620 Now what if the person puts something that is not the color. 15:07.650 --> 15:10.500 Go ahead and put in else. 15:10.530 --> 15:13.860 Then we can go ahead and print out. 15:14.250 --> 15:15.840 Let's go ahead and see. 15:18.000 --> 15:19.050 This. 15:21.390 --> 15:28.230 This color is equal to invalid. 15:31.200 --> 15:32.130 Invalid color. 15:32.730 --> 15:34.020 Semicolon at the end. 15:34.050 --> 15:35.340 Let's save this. 15:36.030 --> 15:38.580 So this is equal to invalid color. 15:38.610 --> 15:43.470 Now we need to actually go ahead and print this out. 15:44.430 --> 15:46.980 So let's go ahead and check it out. 15:47.310 --> 15:49.320 Now we want to run this. 15:49.320 --> 15:54.750 Where we're going to do is let's go down here and uh, say uh, Rambo. 15:57.000 --> 16:05.580 Let's say Rambo is, uh, I think equal greater than and, uh, sets some set color. 16:06.420 --> 16:10.110 So Rambo, I think rather than set color. 16:10.110 --> 16:18.810 And then we go ahead and, uh, pass in a parameter right here that let's say we have, uh, a block 16:18.810 --> 16:19.470 right in here. 16:19.470 --> 16:22.020 So go ahead and put a semicolon and save this. 16:22.020 --> 16:24.180 And let's go ahead and run this again and check it out. 16:24.180 --> 16:29.490 So invalid color the block we have is the one coming from here which had previously. 16:29.520 --> 16:36.660 We're going to modify this so that this will not be affected again because if we go ahead and uh let 16:36.660 --> 16:39.240 me go ahead and comment on this, let's go ahead and comment on this. 16:39.240 --> 16:44.100 So if we comment on this, on save this and I refresh this, you're going to get block because that 16:44.100 --> 16:45.270 block is still coming from here. 16:45.300 --> 16:45.780 So. 16:45.780 --> 16:53.250 So I can actually come over here and say that the color of a rainbow is white, and it will still work. 16:53.280 --> 16:54.030 You see that? 16:54.060 --> 16:56.460 But if you use this, nothing works. 16:56.460 --> 17:04.500 So the problem is how do we actually lock this so that only these colors will actually be printed out? 17:04.530 --> 17:12.720 Now what I'm going to do is go back to this place where you said this color is equal to this attribute. 17:12.750 --> 17:21.570 Now, what I'm going to do right in here is I will go right here and I'm going to say this set color. 17:21.600 --> 17:27.030 So I'm going to call this function with code here. 17:27.060 --> 17:30.060 I'm going to say this set color. 17:30.060 --> 17:34.260 And then I'm going to pass the color right in there. 17:35.520 --> 17:35.970 All right. 17:35.970 --> 17:40.050 So go ahead and pass the color right in there. 17:40.050 --> 17:53.400 And I'll go ahead and get rid Three of these and I remove this and remember to put your dollar sign 17:53.400 --> 17:55.080 so you don't run into an error. 17:55.110 --> 17:56.010 Go ahead and save this. 17:56.010 --> 17:58.680 So I have modified what we have right in here before. 17:58.680 --> 18:02.220 And then if I actually go over here I'll run this code again. 18:02.220 --> 18:06.780 And let's check what it gives us. 18:06.810 --> 18:12.900 We say this setcolor and we pass in this color right in here. 18:13.050 --> 18:18.060 And, uh, let's go ahead and make sure everything works fine. 18:18.600 --> 18:23.550 Alright, now we have to create the, uh, setup, which is the setcolor. 18:23.550 --> 18:26.910 And, uh, if we go right in here, I'll refresh this. 18:26.940 --> 18:28.050 We still see black. 18:28.050 --> 18:36.630 What if we go over here and then let me say we have our this and I'm going to say rainbow. 18:37.650 --> 18:42.120 And once caught a rainbow and our hyphen grades are done. 18:42.120 --> 18:47.000 And then a golden sea sets color. 18:47.150 --> 18:50.000 And then I'm going to pass in the parameter. 18:50.030 --> 18:51.920 I will say red. 18:51.920 --> 18:56.300 And then at the end and run this code red. 18:56.330 --> 19:00.680 Now go back to this parameter and add some satellite black. 19:02.900 --> 19:03.980 Then set this up. 19:03.980 --> 19:05.330 Run this code and check it out. 19:05.360 --> 19:06.440 Invalid color. 19:08.060 --> 19:12.560 You can see that this sets or the setter is actually working fine. 19:12.710 --> 19:14.750 So we have done this function. 19:14.780 --> 19:16.160 I have done this get function. 19:16.160 --> 19:22.490 And what remains right now is for us to actually look up this so that someone can no longer cheat this. 19:22.490 --> 19:29.150 Because if I should comment on this and go back here and run this code and get some black and that's 19:29.150 --> 19:36.020 black is coming from here, how do we stop people from altering this and make sure that we only print 19:36.050 --> 19:37.760 out the colors that are inside here? 19:38.870 --> 19:40.520 So how can we be able to do that? 19:40.520 --> 19:41.990 That is where the question equation is. 19:41.990 --> 19:45.980 So go to your constructor function and which we have right in here. 19:46.010 --> 19:51.950 So can we able to actually make this to be functioning and look good. 19:51.980 --> 19:57.260 Because that is where what we need to do and make sure that everything works fine. 19:57.260 --> 20:02.060 So go back to constructor and we're going to say this and that. 20:02.060 --> 20:08.570 Instead of column we are going to add in this set color which we actually print here. 20:08.600 --> 20:10.430 So we actually created it. 20:10.430 --> 20:11.780 So I'm going to copy this. 20:11.810 --> 20:13.940 Then I'll go right here. 20:14.060 --> 20:17.090 And I'm going to replace the color with this. 20:17.090 --> 20:22.520 And instead of adding a call to ball color go ahead and delete this. 20:22.700 --> 20:25.610 And now we have this right in here. 20:25.850 --> 20:27.050 So that is cool. 20:27.920 --> 20:32.150 That is what is needed for us to achieve what we are doing. 20:32.150 --> 20:33.440 So you have this here. 20:33.440 --> 20:35.630 You go ahead and refresh this. 20:35.630 --> 20:42.770 And it says undefined variable in line 15 which is the color. 20:42.860 --> 20:44.030 And, uh. 20:46.160 --> 20:48.950 We have color right in here. 20:49.070 --> 20:52.430 And let's go ahead and make sure everything works fine. 20:53.930 --> 20:59.420 So what I actually noticed that when we change the background color, we didn't actually change this 20:59.420 --> 21:02.720 variable because we didn't declare that inside this constructor. 21:02.720 --> 21:05.000 So we can see we still have color right in here. 21:07.520 --> 21:08.030 All right. 21:08.030 --> 21:09.260 So what's actually happening. 21:09.260 --> 21:16.640 And what I'm seeing is that when we changed this, uh, this blue color, we actually remove this as 21:16.640 --> 21:23.690 well because the color was not actually, uh, defined inside this constructor. 21:23.690 --> 21:26.150 So we still have when we deleted this idea. 21:26.180 --> 21:30.170 So we can remove the color and put this to be color, okay. 21:30.170 --> 21:33.290 Because that is actually needed right inside here. 21:33.290 --> 21:36.740 So go ahead and save this. 21:36.770 --> 21:38.570 And now we have save this. 21:38.570 --> 21:40.420 And let's go ahead and refresh fragrance again. 21:40.420 --> 21:43.480 So have invalid color because the black is still here. 21:43.480 --> 21:47.200 So what if I put something like, uh, indigo? 21:49.360 --> 21:51.280 All right, so that is indigo. 21:51.310 --> 21:55.630 And let's go ahead and save this and refresh I will have indigo is printed out. 21:55.630 --> 22:03.820 So if I had put something like, uh Violet and then we save this, we save Violet. 22:03.820 --> 22:10.450 So if someone goes right in there and puts a block again as a color, we can see the black is no longer 22:10.450 --> 22:12.610 accepted, invalid color. 22:12.610 --> 22:20.680 And if someone goes right in here and puts in white and, uh, save this and check it out, you can 22:20.680 --> 22:21.970 see invalid. 22:21.970 --> 22:26.770 So that is how a way you can be able to use getters and setters in your program. 22:26.770 --> 22:28.840 And it looks so beautiful. 22:28.840 --> 22:30.160 So go ahead and check it out. 22:30.160 --> 22:33.640 And if you have any questions, please use the question and answer section. 22:33.640 --> 22:35.830 And I'm going to get back to you as soon as possible. 22:35.830 --> 22:36.700 Thank you so much. 22:36.700 --> 22:39.610 And I'm going to see you in the next video lecture.