WEBVTT 00:00.890 --> 00:05.270 Okay, so so far we've been only building the command line programs. 00:05.270 --> 00:12.560 So programs that run in a terminal in a command line interface without a graphical user interface. 00:12.560 --> 00:16.880 And we did that to focus on the PHP language. 00:16.880 --> 00:23.720 It's time to change that and use PHP for what it was made for, which is building dynamic websites. 00:23.720 --> 00:29.600 And that means that we are about to build our first dynamic website. 00:29.600 --> 00:36.740 This would be a very small project, but it will teach us a couple of things and you see it on the screen. 00:36.740 --> 00:39.530 Let me describe what we are going to learn first. 00:40.250 --> 00:45.980 So first and foremost you are going to learn how to start the PHP build in server. 00:45.980 --> 00:54.350 So the PHP binary has a built in web server, which means you don't need any external web server to 00:54.380 --> 01:00.850 run PHP websites, at least for development purposes at your own computer. 01:01.090 --> 01:03.700 Then the things that we're going to learn. 01:03.910 --> 01:07.210 We are going to learn about super globals. 01:07.210 --> 01:10.840 Those are special global variables in PHP. 01:10.870 --> 01:12.220 They are predefined. 01:12.250 --> 01:19.330 They don't require you to use the global keyword, and they are available everywhere and you can't override 01:19.360 --> 01:19.990 them. 01:20.110 --> 01:27.040 There is plenty of them, and they contain a lot of information about PHP, about the environment, 01:27.040 --> 01:29.920 about the request and user input. 01:32.410 --> 01:39.250 The next thing I'd like to focus on is actually a concept, not something strictly related to PHP. 01:39.520 --> 01:46.960 And this is to separate the logic of the page, which is this part where we generate data or read data 01:47.080 --> 01:52.150 from the part that is responsible for displaying the HTML. 01:52.150 --> 01:54.040 I think it is a good practice. 01:54.070 --> 01:59.420 It makes this code readable And things are just easier to find here. 01:59.420 --> 02:03.380 So while speaking about this, let's call it Presentation Layer. 02:03.380 --> 02:10.040 We're going to learn about this shortcut PHP way to quickly output the value of an expression or variable. 02:10.040 --> 02:11.750 So this is this equal sign. 02:11.750 --> 02:14.570 Here you don't need to use the echo statement. 02:14.570 --> 02:18.320 And also semicolon is not required here. 02:18.350 --> 02:24.440 And then there is also the alternative syntax for for each loop. 02:24.440 --> 02:29.180 And every control structure in PHP has this alternative syntax. 02:29.390 --> 02:33.800 So you've got the colon instead of curly braces. 02:33.800 --> 02:39.890 And also the ending is end for each not a curly brace. 02:40.610 --> 02:43.490 And about the project itself, it's rather simple. 02:43.490 --> 02:46.340 We're just gonna display the current server time. 02:46.340 --> 02:51.830 So keep in mind that not the time on your computer, it is the PHP server time. 02:51.830 --> 02:53.390 So they might differ. 02:53.390 --> 02:59.740 And then we're gonna to format all the information from the server in a nice table. 03:00.040 --> 03:01.360 So let's get started. 03:01.930 --> 03:05.110 So we start with just the PHP tag. 03:05.140 --> 03:08.650 Let me define a page title variable. 03:08.710 --> 03:12.880 This would be dynamic PHP page. 03:13.870 --> 03:17.290 And I'm going to close the PHP section right now. 03:17.320 --> 03:20.920 So the goal is that on the top we've got the logic of the page. 03:20.920 --> 03:24.310 And on the bottom we just output HTML. 03:24.400 --> 03:31.750 So let me add an HTML tag a head section where I'm going to output this title. 03:33.130 --> 03:35.740 So I'm using this shorthand syntax. 03:35.920 --> 03:37.240 Page title. 03:37.240 --> 03:41.500 And here I don't need the semicolon. 03:43.540 --> 03:48.220 So after refreshing this page we can see the title is already there. 03:50.740 --> 03:51.160 Okay. 03:51.160 --> 03:54.740 Next up let's display the current time. 03:55.010 --> 04:02.390 So maybe that's not the times where we display the current time on the websites, but we are just playing 04:02.390 --> 04:03.260 around. 04:03.620 --> 04:06.860 So here I'm going to call this date function. 04:06.860 --> 04:11.600 It accepts a specific string which is called the date format. 04:11.600 --> 04:18.680 So you can look up the date function in PHP manual because it describes how you can construct a very 04:18.680 --> 04:20.090 specific date. 04:20.090 --> 04:22.790 In this case this will show that day. 04:22.790 --> 04:26.630 Well, this will show the time including minutes and seconds. 04:27.290 --> 04:29.570 So now let's display this value. 04:29.570 --> 04:32.180 For that we need a body section. 04:32.180 --> 04:35.300 So the actual page content. 04:35.300 --> 04:38.870 So I'm just going to say welcome for now. 04:38.870 --> 04:41.270 And let's add a paragraph. 04:41.270 --> 04:45.770 So we're going to say that the current server time this is important. 04:45.770 --> 04:48.200 It is not your time on your machine. 04:48.200 --> 04:58.540 That's the time of PHP Now lets use this shorthand syntax to output stuff and we use the current time. 04:58.540 --> 04:59.320 And that's it. 04:59.320 --> 05:00.550 Let's refresh the page. 05:00.550 --> 05:04.630 Keep in mind you will have to refresh this page every single time. 05:04.630 --> 05:07.210 It's not happening automatically. 05:07.990 --> 05:11.770 Okay, let's zoom in a bit because I'm not sure this is visible. 05:11.770 --> 05:18.730 Now there is a special kind of variables in PHP and this is called super globals. 05:18.730 --> 05:23.470 So super globals are variables that are available globally. 05:23.470 --> 05:26.710 And you don't need to add the global keyword. 05:26.710 --> 05:32.560 They are really available globally and you can't override their value. 05:32.590 --> 05:34.960 They are kind of read only. 05:34.960 --> 05:40.180 That's why they are not called globals, but they are called super globals. 05:40.960 --> 05:45.250 The names of those variables typically start with an underscore. 05:45.250 --> 05:46.660 So you've got cookie. 05:46.690 --> 05:53.160 You've got environment variables, files that are uploaded and others. 05:53.400 --> 05:57.540 For now, let's vardump the server super global. 05:57.540 --> 06:04.260 So as you see, this contains quite some information like HTTP headers. 06:04.260 --> 06:09.690 The the request URI uh server name which is localhost. 06:09.690 --> 06:12.240 Well useful information. 06:12.810 --> 06:22.830 So now we're going to use this server super global and display this information nicely in a table. 06:22.830 --> 06:29.580 So what we want to do here is a kind of information page about PHP okay. 06:29.580 --> 06:37.170 So right below this paragraph let me add a table because we want this information in a table. 06:37.170 --> 06:44.760 Every table needs a header where you have some columns with titles of those columns. 06:44.760 --> 06:49.210 Let's add a row and two columns. 06:49.870 --> 06:53.050 I'd like this text to be in bold. 06:53.050 --> 06:55.150 So we've got the key. 06:55.150 --> 07:05.770 And next up we've got the value after the T head section we've got T body, which as you can guess contains 07:05.770 --> 07:07.270 the actual elements. 07:07.300 --> 07:15.250 Now you're gonna see the alternative control structure syntax, which is not super different, but it 07:15.250 --> 07:20.380 is often used with when PHP is mixed with HTML. 07:20.380 --> 07:22.780 It is more convenient then. 07:22.840 --> 07:31.780 So we're gonna iterate over this server super global and we want both the key and the value. 07:32.500 --> 07:35.050 So this is this alternative syntax. 07:35.050 --> 07:39.760 Instead of using curly braces you're gonna use a colon. 07:39.880 --> 07:41.560 And that's everything. 07:41.590 --> 07:46.820 Now you need to also close this for each loop. 07:46.940 --> 07:51.980 And you do that by typing and for each. 07:54.830 --> 07:55.550 All right. 07:55.580 --> 08:04.580 Now inside let's add a row and two columns that will display the value. 08:04.880 --> 08:14.570 So we basically now need to output the key without semicolons in case of this shorthand syntax. 08:14.570 --> 08:18.770 And as you can guess the value. 08:20.210 --> 08:23.210 I think this should work fine. 08:23.210 --> 08:27.410 So now initially we had this data var dumped. 08:27.410 --> 08:29.480 It's totally unreadable. 08:29.480 --> 08:31.400 Now let me refresh the page. 08:31.400 --> 08:34.250 And this is what we have right now. 08:34.640 --> 08:42.320 The current server time and all the information about the request in a nicely formatted table.