WEBVTT 00:00.560 --> 00:03.770 I will call you back again to another video lecture in PHP. 00:03.770 --> 00:09.860 And in this video lecture, let's go ahead and look at functions in PHP. 00:16.880 --> 00:17.390 All right. 00:17.390 --> 00:19.970 So we're going to look at functions in PHP. 00:19.970 --> 00:26.180 And then we're going to understand what function does and how to use functions in our programs. 00:26.180 --> 00:35.060 So functions are basically a container that we put a piece of information which can perform a specific 00:35.060 --> 00:35.900 task. 00:35.900 --> 00:43.310 So if I want to perform a specific task and you just want to put that inside a container and it can 00:43.310 --> 00:49.190 actually use that container, and it can actually also reuse the container as many times as possible. 00:49.190 --> 00:49.970 You want. 00:50.180 --> 00:55.760 Let me go ahead and start by showing you an example. 00:55.790 --> 00:58.040 Let me go ahead and say echo. 00:59.450 --> 01:02.200 Welcome to pee pee. 01:02.710 --> 01:03.040 All right. 01:03.070 --> 01:05.740 And I've gone ahead and, uh, set these. 01:05.740 --> 01:08.710 So if we go ahead and refresh this, we have. 01:08.740 --> 01:09.970 Welcome to pee pee. 01:11.020 --> 01:14.080 No, this is not inside a function. 01:14.500 --> 01:22.990 I can go ahead and go right in here and, uh, create a function and, uh, this ahead and start. 01:23.050 --> 01:28.990 And we're going to put that we're going to be inside a function and I will see how to use a function. 01:28.990 --> 01:32.410 Now let me go ahead and give that function a name. 01:32.410 --> 01:37.630 Because whenever you create a function, all your functions must have a name so that you can be able 01:37.630 --> 01:39.520 to call that function. 01:39.820 --> 01:40.390 All right. 01:40.390 --> 01:46.270 So let's go ahead and uh say I'll go ahead and say the name is Hello world. 01:48.460 --> 01:48.940 All right. 01:48.940 --> 01:51.190 So that is Hello world. 01:51.190 --> 01:58.900 And uh anytime qualification always go ahead and uh put open and close parentheses and I'll go ahead 01:58.900 --> 02:01.830 and, uh, Cut off this right in here. 02:02.520 --> 02:11.010 Now, if I save this on a fresh, you can see that nothing happens because this function has nothing 02:11.010 --> 02:11.910 right in there. 02:11.910 --> 02:18.840 So if I should go right inside this place and anything I write inside here will be printed out for me. 02:19.380 --> 02:21.810 Remember I wrote Hello World in the beginning? 02:21.810 --> 02:26.100 If I should go ahead and paste it right in there and I'll go ahead and save this. 02:26.100 --> 02:29.010 Now let's check if this will work or not. 02:29.700 --> 02:32.970 Now you can see it never worked. 02:34.620 --> 02:42.480 All right, so you might be like, I've created a function and I put in Hello World and I put in welcome 02:42.480 --> 02:43.290 to PHP. 02:43.290 --> 02:45.300 And that didn't actually work. 02:45.300 --> 02:53.490 So what makes PHP not work when we are we refresh the page is because we did not call the function. 02:53.490 --> 02:57.720 So whenever you create a function, you must always call that function. 02:57.720 --> 03:01.520 So for that function to work, this function was always be called. 03:02.420 --> 03:04.700 Now let's go ahead and call a function. 03:04.700 --> 03:06.320 So how do you call a function. 03:06.320 --> 03:13.550 You just put in the name of the function and open up parentheses and put a semicolon at the end and 03:13.550 --> 03:14.240 save this. 03:14.240 --> 03:16.190 Now we have called this function. 03:16.370 --> 03:18.320 Let's refresh and check it out. 03:18.350 --> 03:20.330 Welcome to PHP. 03:22.010 --> 03:22.640 That is simple. 03:22.640 --> 03:30.050 Right now what if I want to pass in some information to this function. 03:30.170 --> 03:34.700 And if I want to pass information to the function is called a parameter. 03:34.700 --> 03:36.410 It is inside there. 03:36.410 --> 03:40.310 So what am I going to type right inside here your personal information to this function. 03:40.310 --> 03:42.680 So you need to pass in a parameter. 03:42.710 --> 03:45.050 Now let's go ahead and delete everything. 03:45.050 --> 03:47.420 We just got word a read in yet. 03:47.690 --> 03:54.140 So if I should go ahead and say I want in I want to see. 03:54.170 --> 03:55.460 Welcome to PHP. 03:55.490 --> 03:59.450 But I want PHP not to be right inside there. 03:59.480 --> 04:05.230 But I want that to be giving us an information or as a parameter. 04:05.230 --> 04:12.910 What I want it to do is go ahead and put in a variable, and I'm going to call that to be name. 04:12.910 --> 04:16.210 So that is name of the programming language. 04:16.210 --> 04:21.550 And I'll go right in here and pass in that. 04:21.550 --> 04:25.240 So go right in here and say name. 04:26.230 --> 04:29.860 So I have name I've passed in a parameter name inside this function. 04:29.860 --> 04:32.650 And I'll have to equal out the name. 04:32.650 --> 04:36.040 Welcome to whatever parameter I just pass in there. 04:36.040 --> 04:38.530 So I'll go where we call the function. 04:38.530 --> 04:40.930 And I'll go ahead and pass p h p. 04:40.930 --> 04:42.520 And let's save that. 04:42.520 --> 04:44.560 So refresh this I check it out. 04:44.590 --> 04:46.090 Welcome to PHP. 04:47.500 --> 04:55.150 So now I can go right in here and I can go ahead and say we come to CSS and let's go ahead and save 04:55.150 --> 04:59.380 this and see how we come to CSS. 05:01.110 --> 05:04.020 No, you can actually change that. 05:04.020 --> 05:06.600 And you can actually reuse this function. 05:06.600 --> 05:09.840 So I can use this function as many times as possible. 05:09.870 --> 05:14.280 What I need to do is to call this function multiple times. 05:14.280 --> 05:21.330 So if I take this and I paste this maybe also three times, and if I refresh this, it's going to be 05:21.360 --> 05:22.350 on one straight line. 05:22.380 --> 05:28.770 What I need to do right in here is that I'll go back in here and I'm going to put a break tag right 05:28.770 --> 05:29.190 here. 05:29.190 --> 05:33.030 So save this and refresh and have welcome to CS. 05:33.060 --> 05:36.000 Welcome to CS and welcome to CS. 05:36.360 --> 05:39.300 So you can see I was able to reuse this. 05:39.300 --> 05:41.880 So now I can pass in maybe the first one. 05:41.910 --> 05:49.950 I can say welcome to PHP and welcome to the next song is HTML. 05:50.040 --> 05:52.530 And then the last one is welcome to CS. 05:52.530 --> 05:55.860 So if we refresh this you can see we have welcome to PHP. 05:55.950 --> 05:57.300 Welcome to HTML. 05:57.330 --> 05:58.920 Welcome to CS. 05:58.940 --> 06:02.180 So we are able to reuse this function now. 06:02.210 --> 06:03.770 This is the function we created. 06:03.770 --> 06:05.720 So we can create many functions. 06:05.750 --> 06:07.130 And we can call the functions. 06:07.130 --> 06:10.970 And whenever we call that function it is the key to whatever it is in there. 06:10.970 --> 06:14.390 So you can also pass in parameters into your functions. 06:15.590 --> 06:20.630 So this is a single parameter you can pass in multiple parameters. 06:20.660 --> 06:28.610 Let me go ahead and say this is a I pass in name a comma and put another variable and let the variable 06:28.640 --> 06:29.840 be code. 06:29.840 --> 06:33.110 And then let me say this is a PHP 101. 06:33.110 --> 06:34.790 So welcome to PHP. 06:36.230 --> 06:43.310 Um, and I can say welcome to PHP course 101. 06:43.310 --> 06:47.510 So it's going to be code. 06:47.510 --> 06:48.860 So I pass in code. 06:48.860 --> 06:50.660 So welcome to PHP course 101. 06:50.660 --> 06:55.100 So anytime you put in parameter right in here you have to pass in that. 06:55.130 --> 07:03.310 Go down here and say and this is 101 and let me say the next one is 102. 07:03.340 --> 07:07.630 And uh, the next code is 103. 07:07.630 --> 07:09.340 And the sky has said this. 07:09.340 --> 07:11.950 So go ahead and refresh and check it out. 07:12.730 --> 07:14.110 So go ahead and start this. 07:14.140 --> 07:16.300 Welcome to PHP course 101. 07:16.300 --> 07:18.790 Welcome to HTML course 102. 07:18.820 --> 07:21.370 Welcome to CS course 103. 07:21.790 --> 07:24.760 So you can use this as a maybe somebody's name. 07:24.790 --> 07:26.050 Uh, we can't judge. 07:26.080 --> 07:28.090 Your age is 24. 07:28.120 --> 07:32.440 What comes to your age is 26. 07:33.100 --> 07:34.900 So you can actually do that. 07:35.050 --> 07:35.560 All right. 07:35.560 --> 07:38.980 So now we have this course function. 07:38.980 --> 07:43.360 And you have known that functions can be created multiple times. 07:43.360 --> 07:47.860 So we can have different functions to do different jobs in a program. 07:47.860 --> 07:54.970 And in doing that it is easier for you to be able to, you know, clean your code and makes it easy 07:54.970 --> 07:55.870 to use. 07:56.080 --> 08:03.720 You understand, it helps you to be able to organize the code and be able to have your code troubleshoot. 08:03.720 --> 08:09.360 Anytime you have an issue, you have to always go to the function and check out what the problem is 08:09.390 --> 08:12.390 and fix that instead of writing a bunch of code. 08:12.420 --> 08:14.070 Everything without a function. 08:14.070 --> 08:20.580 So I believe you understand what a function is is just a container that is containers, a piece of information 08:20.580 --> 08:24.360 that is the kids that do a specific job. 08:24.540 --> 08:31.260 So is a container, contain a piece of information that do a specific job, and you can reuse your function 08:31.290 --> 08:33.330 as many times as possible. 08:33.960 --> 08:37.920 And the functions contain such information as of parameters. 08:37.920 --> 08:45.030 So it can put in some parameters and in your head and do the job just the way you want it to do it. 08:45.060 --> 08:46.440 So I hope that is cool. 08:46.440 --> 08:48.120 So go ahead and play around with this. 08:48.150 --> 08:52.080 Check it out and if you have any questions use the question and answer section. 08:52.080 --> 08:54.570 And I'm going to get back to you as soon as possible. 08:54.600 --> 08:55.620 Thank you so much. 08:55.620 --> 08:58.770 And I'm going to see you in the next video lecture.