WEBVTT 00:00.590 --> 00:03.500 I will call you back again to our another video lecture in PHP. 00:03.500 --> 00:10.040 And in this video lecture I will go ahead and teach you about why in PHP. 00:17.510 --> 00:17.870 All right. 00:17.870 --> 00:23.960 So in PHP we have what is called a loop system, which makes a program to run repeatedly. 00:23.960 --> 00:27.590 It makes a program to be able to execute multiple times. 00:27.710 --> 00:37.790 Let's go ahead and say I want to equal let's say equal one plus semicolon and save this. 00:37.790 --> 00:39.770 And let's refresh this one. 00:40.250 --> 00:41.720 I'll go ahead and copy this. 00:42.110 --> 00:45.890 Then I'll go ahead and paste this multiple times. 00:47.000 --> 00:47.330 All right. 00:47.330 --> 00:59.300 So I'm going to say equal two equal three equal four and five. 00:59.330 --> 01:00.710 Now let's save this. 01:01.140 --> 01:05.850 So if I got it on a fresh piece, have one, two, three, four, five. 01:06.570 --> 01:07.440 You see that? 01:07.470 --> 01:13.230 Now if you want to, you can actually put that to be one output to break. 01:14.310 --> 01:22.950 And in a way I can go ahead and copy this and press ahead and paste this. 01:25.380 --> 01:26.040 Right here. 01:26.760 --> 01:34.800 So because it changes again to 234 and five. 01:34.800 --> 01:36.630 So this kind of refreshes and check it out. 01:36.630 --> 01:38.280 So 12345. 01:38.280 --> 01:39.810 So you can see how long it takes me. 01:39.810 --> 01:46.620 It takes me about uh five lines of code to be able to print out 1234, five. 01:46.650 --> 01:52.170 Now imagine if I want to print out this 1 million or I want to print out 2 million. 01:52.200 --> 01:56.880 It means I have to equal out these four up to 2 or 3 million. 01:57.630 --> 02:04.100 Now I'll go ahead and get rid of this random of this, and we'll show you how we can be able to do that 02:04.100 --> 02:05.420 using a loop system. 02:05.420 --> 02:10.220 So that is if you want to be able to print out just like we did this. 02:10.250 --> 02:17.780 Now let's go ahead and create a variable and uh, let me say um variable known. 02:17.780 --> 02:19.430 So I'm going to call that to be known. 02:19.460 --> 02:21.020 And we want to print out numbers. 02:21.020 --> 02:25.190 And uh num is equal to one starting from one. 02:25.220 --> 02:27.080 That is where I want to start. 02:27.770 --> 02:32.750 Now what I need now is I have to create a statement called a while loop. 02:32.780 --> 02:37.130 So is a kind of a loop system called Y. 02:37.130 --> 02:39.200 And I want to hit on enter. 02:39.230 --> 02:41.780 You see that it gives the condition by itself. 02:41.780 --> 02:46.580 So y the very first one is uh the variable name. 02:46.580 --> 02:47.840 So y known. 02:47.870 --> 02:51.110 You can change that to any name is less than or equal to ten. 02:51.140 --> 02:51.320 Okay. 02:51.320 --> 02:52.130 Let me start with ten. 02:52.160 --> 02:53.270 That is what is given there. 02:53.270 --> 02:58.520 I can say maybe 20 or 5000 millions and so on. 02:58.760 --> 03:03.270 Now you go right in here A and that is the condition we are looking at. 03:03.300 --> 03:06.870 We are always going to take from 1 to 10. 03:07.170 --> 03:09.870 Now how are you going to do that? 03:09.900 --> 03:17.820 I will now go ahead and echo and will pass in a string right in there, and I will pass in that variable 03:17.820 --> 03:18.780 we just created. 03:18.780 --> 03:21.060 So known. 03:21.180 --> 03:26.310 And then for anytime I pass known, I want to move to the next line so that you can be able to see the 03:26.310 --> 03:29.370 variable whatever we are printing out. 03:29.760 --> 03:31.440 So now let's go ahead and print this out. 03:31.470 --> 03:35.700 I save this and you can see I have one being printed to infinity. 03:35.820 --> 03:43.380 Now what happens is that we do give a condition that we want this to be able to increment to one, two, 03:43.410 --> 03:43.740 three. 03:43.740 --> 03:48.180 So whenever it comes here it says one is less than or equal to ten. 03:48.210 --> 03:50.220 It brings that out whenever it comes. 03:50.250 --> 03:52.290 It said one is less than or equal to ten. 03:52.320 --> 03:53.490 It prints that out. 03:53.490 --> 03:58.560 And if you can watch my system, I'm scrolling down and this is printing to infinity. 03:58.590 --> 03:59.520 You understand. 03:59.520 --> 04:02.680 So That is an infinite loop. 04:02.680 --> 04:04.540 You can see I'm still squaring down. 04:04.540 --> 04:12.550 So now what I want to do is I want to give a condition that when one comes is printed at the first time, 04:12.550 --> 04:19.210 it goes back to the condition at check and it will increment and then go back to the condition. 04:19.210 --> 04:23.530 I check and come back and increment until it gets to ten. 04:23.560 --> 04:35.800 Now I'll go over here and I'm going to say put in the variable name known, and I'm going to see known 04:35.830 --> 04:37.570 increment two times. 04:37.570 --> 04:40.990 So that addition means increment twice. 04:40.990 --> 04:43.780 So what it means is that I will refresh this. 04:43.810 --> 04:44.830 Let's check it out. 04:45.580 --> 04:46.570 It goes the first one. 04:46.600 --> 04:49.060 You see that I need to print 1 to 10. 04:49.090 --> 04:52.030 It goes the first time and print out one. 04:52.060 --> 04:54.580 Then it goes back and check the condition. 04:54.580 --> 05:00.610 And the condition sees increment again and one to the variable making it two. 05:00.640 --> 05:02.210 Then it prints out two. 05:02.240 --> 05:08.690 Then it goes back again and check and it says add another one to that and check if it is less than ten. 05:08.720 --> 05:16.550 It increments again, and when it gets to ten it says keep adding, but always check if it is below 05:16.550 --> 05:16.940 ten. 05:16.940 --> 05:18.380 So when it gets to ten it adds. 05:18.380 --> 05:20.300 And that is that is 11. 05:20.330 --> 05:25.580 It goes back as a no 11 is greater than ten, 11 is not less than. 05:25.580 --> 05:26.900 And it breaks out. 05:27.410 --> 05:31.970 So it stops at anything less than ten. 05:32.060 --> 05:36.500 So if you set this to start from zero, go ahead and put a zero right in and save this. 05:36.530 --> 05:39.890 I refresh this and you can see I started from zero. 05:40.130 --> 05:48.140 And it remains to one two because it starts at 12345678 9 to 10. 05:48.170 --> 05:50.900 Now I said this is less than or equal to ten. 05:50.930 --> 05:55.070 What if I say this is less than ten and the guy had on a fresh. 05:55.100 --> 05:59.450 You can see that ten is not included because it must be less than ten. 05:59.570 --> 06:02.050 What if I said less than or equal to ten. 06:02.080 --> 06:03.880 It means that ten is included. 06:04.690 --> 06:08.920 So this is about while loop in PHP. 06:08.950 --> 06:12.040 So I believe that's all from the explanation you got. 06:12.070 --> 06:16.720 How and why we are using while loop in case you want to print out hundred. 06:17.260 --> 06:22.900 So you can actually use it to print out hundred and say this is hundred. 06:22.960 --> 06:27.640 And let's go ahead and okay, let me just select 20 because this might be very long. 06:27.670 --> 06:30.160 Let's say 20 and refresh. 06:30.160 --> 06:31.330 And we get down. 06:31.330 --> 06:33.160 You can see I have 20 down here. 06:33.160 --> 06:39.610 So if I do dot 200 I have to scroll down all the way down to hundred for you to see that. 06:39.610 --> 06:41.770 So go ahead and play around with them. 06:41.770 --> 06:46.360 You can do that 200 and scroll down to the bottom of your browser. 06:46.360 --> 06:48.100 And you can see 100 down there. 06:48.100 --> 06:50.410 So check it out, play around with it. 06:50.410 --> 06:55.000 And if you have if you have any question, go ahead and use the question and answer section. 06:55.000 --> 06:57.640 And I'm going to get back to you as soon as possible. 06:57.670 --> 06:58.720 Thank you so much. 06:58.720 --> 07:01.990 And I'm going to see you in the next video lecture.