WEBVTT 00:00.890 --> 00:04.130 I welcome you back again to another video lecture in PHP. 00:04.130 --> 00:08.450 And in this video lecture we go ahead and look at comments in PHP. 00:15.560 --> 00:18.260 Oh, I saw comments play a vital role. 00:18.290 --> 00:19.070 Yes. 00:19.100 --> 00:24.140 Why I said it plays a vital role is because someone will say hey, this is comments. 00:24.170 --> 00:26.300 What role does comments play? 00:26.600 --> 00:32.720 Comments plays a vital role in PHP and in other programming languages, because you can actually use 00:32.720 --> 00:38.600 comments to be able to make your work look more simplified and manageable. 00:38.600 --> 00:44.540 So we can actually go to your work, understand what is happening, and then be able to manage your 00:44.540 --> 00:45.260 code. 00:45.560 --> 00:49.910 So comments are not doing that in PHP. 00:49.910 --> 00:51.530 So let's go ahead and see. 00:51.530 --> 00:53.930 We have this code equal. 00:53.930 --> 01:02.600 And we go ahead and say uh welcome to p h p and a semicolon at the end thereof. 01:02.600 --> 01:03.830 We'll go ahead and run this. 01:03.830 --> 01:04.130 We have. 01:04.130 --> 01:05.150 Welcome to PHP. 01:05.180 --> 01:10.290 Now if I go ahead and write anything here, it's going to an error. 01:10.560 --> 01:13.560 So yes, if I go ahead and check this out you see an error. 01:13.590 --> 01:23.460 Now if I go ahead and try to convert this to be comments, what I need to do is I can put double O for 01:23.460 --> 01:25.920 slash and go ahead and save this. 01:25.950 --> 01:28.680 Ah first is the error is gone. 01:28.680 --> 01:36.270 So anything that you write after this double forward slash is a comment. 01:37.470 --> 01:43.560 Now if I go down here and I'm going to copy this, let's copy this again. 01:43.620 --> 01:45.930 And I'll go ahead and paste that. 01:45.930 --> 01:48.210 And then go ahead and write another thing. 01:48.450 --> 01:51.810 And then we always know it's going to throw an error. 01:51.810 --> 01:53.400 If I run this you have an error. 01:53.400 --> 01:59.790 And then we go ahead and put this a hashtag and run this code. 01:59.820 --> 02:01.080 The error is gone. 02:01.770 --> 02:04.170 So you can use double for slash. 02:04.200 --> 02:09.270 You can use a hashtag to actually create a single line comment. 02:09.930 --> 02:12.970 In PHP it is called a single line comment. 02:13.360 --> 02:21.400 If you use double forward slash or single hashtag, that is a single line comment. 02:21.430 --> 02:27.700 Now why I say this plays a vital role in PHP and other programming languages is that you can actually 02:27.700 --> 02:33.400 specify what this line of code is actually doing, or what this block of code or a function is a try 02:33.430 --> 02:36.040 doing, and what someone wants to manage that. 02:36.220 --> 02:42.550 Uh, the person can actually understand what this code is doing, and it can be able to actually, uh, 02:42.550 --> 02:46.390 troubleshoot or work on your code or further improve that. 02:47.020 --> 02:49.420 So you can see that it is very, very interesting. 02:49.450 --> 02:52.900 Now we have what is called a multiple line comment. 02:52.930 --> 03:00.970 Now if I go over here and put this word in here, you can see that if I run this code I have an error 03:00.970 --> 03:04.900 because everything down here is no longer functioning. 03:05.500 --> 03:06.850 What happened? 03:07.240 --> 03:12.220 It happened because this is a multiple line comment that includes job. 03:12.250 --> 03:18.140 So if I go down here and, uh, put in exteriors Serious and false lash again. 03:18.140 --> 03:27.350 You can see if I run this code and nothing is printed out because everything, everything that is inside. 03:27.350 --> 03:29.810 Here is a comment right now. 03:29.810 --> 03:32.600 So is a multiple line comment. 03:32.630 --> 03:39.050 Now if I go ahead and remove this, let's go down here and I'll go ahead and put a forward slash exteriors. 03:39.050 --> 03:44.720 And then I'm going to type anything and move down to the next line and move down to the next line and 03:44.720 --> 03:46.220 move down to the next line. 03:46.220 --> 03:49.010 And now if I go ahead and save this, I'll run this code. 03:49.130 --> 03:51.440 We'll go to PHP, we'll come to PHP. 03:51.800 --> 03:57.260 Now let's go ahead and put a brick right in here and uh, run this code again. 03:57.290 --> 03:58.550 Welcome to PHP. 03:59.600 --> 04:06.380 So you can see we have single line comments with a double forward slash and the single hashtag. 04:06.410 --> 04:09.440 Either one of them can be used as a single line comment. 04:09.440 --> 04:16.520 Then for multiple line comments, use forward slash exteriors and whatever it is in there to any amount 04:16.550 --> 04:28.560 of line is double line or multiple line comment, then You can actually use these to improve your code. 04:28.860 --> 04:35.730 Write and tell people who are going to manage your code whatever a block of code is doing. 04:35.760 --> 04:37.410 So that is very interesting. 04:37.410 --> 04:45.060 So we're going to need that in the in this course we are actually going to always in this course we're 04:45.060 --> 04:52.770 going to always meet comments, because I will be using that to actually make my code more easier and 04:53.070 --> 04:55.290 able to implement some of the things I want to do. 04:55.290 --> 05:00.090 So instead of deleting this, maybe I have these two I want to work with, one I can go ahead and put 05:00.090 --> 05:01.860 the double forward slash. 05:01.860 --> 05:03.600 And then that is a comment. 05:03.600 --> 05:06.900 So I can actually now print out one. 05:07.800 --> 05:09.060 So I hope that is cool. 05:09.090 --> 05:12.030 Now if I go ahead and refresh this I have just one. 05:12.030 --> 05:13.170 Welcome to PHP. 05:13.230 --> 05:16.530 Now I can modify this and use that later somewhere else. 05:16.860 --> 05:18.390 So go ahead and play around with it. 05:18.390 --> 05:22.050 And if you have any question, please go ahead and use the question and answer section. 05:22.050 --> 05:24.480 And I'm going to get back to you as soon as possible. 05:24.510 --> 05:25.440 Thank you so much. 05:25.440 --> 05:28.350 And I'm going to see you in the next video lecture.