WEBVTT 00:00.920 --> 00:03.980 I will call you back again to another lecture in PHP. 00:03.980 --> 00:09.650 And in this video lecture we go ahead and look at strings in PHP. 00:16.520 --> 00:17.000 All right. 00:17.000 --> 00:19.370 So we have always discussed about strings. 00:19.370 --> 00:23.480 And right now we go ahead and focus just on strings alone. 00:23.480 --> 00:26.960 So when we discuss about data types we talked about strings. 00:26.960 --> 00:30.590 And when we discuss about variables we also discussed about strings. 00:30.590 --> 00:34.250 Right now we are discussing about strings on its own. 00:34.250 --> 00:41.090 So string is very important because anything we put in between a quotation mark is a string. 00:41.120 --> 00:46.100 Now let's go ahead and say equal. 00:46.400 --> 00:52.400 And if we go ahead and say this is a J Steve. 00:53.810 --> 00:55.040 Oh I made a mistake. 00:55.040 --> 00:59.570 So this is a just war academy. 00:59.930 --> 01:00.260 All right. 01:00.260 --> 01:06.280 Now if you have this undiagnosed semicolon at the end and if I refresh this, you see how just simple 01:06.280 --> 01:09.640 academy this right inside that quotation mark. 01:09.640 --> 01:12.670 Just simple Academy is a string. 01:13.030 --> 01:19.570 So now we're going to look at different aspects of strings and what I'm, what I'm going to do or what 01:19.570 --> 01:22.660 this string ah function does in PHP. 01:22.990 --> 01:28.660 Now first of all I'm going to put this inside a a variable. 01:28.660 --> 01:31.000 So let's go ahead and create a variable. 01:31.000 --> 01:34.750 And I'm going to call that variable to be my wall. 01:36.070 --> 01:41.860 So let my wall be equal to. 01:45.310 --> 01:46.540 Guest wall. 01:50.080 --> 01:50.920 Academy. 01:51.310 --> 01:53.560 So my wall is equal to guest academy. 01:53.590 --> 01:55.450 Or put a semicolon at the end. 01:55.480 --> 02:05.850 Now if I want to echo this I will simply, simply say see my wall, then press semicolon at the end. 02:05.880 --> 02:07.320 Then we refresh this. 02:07.350 --> 02:10.140 We still have just the War Academy right in there. 02:10.500 --> 02:14.070 Now there are many things we can actually do. 02:14.100 --> 02:19.050 Maybe I want to make this just war academy to have everything go to in lower case. 02:19.080 --> 02:20.340 What am I going to do? 02:20.370 --> 02:22.830 I will go ahead and say echo. 02:22.860 --> 02:25.320 Then I'm going to copy everything right in here. 02:25.320 --> 02:29.670 And I'm going to say echo style. 02:29.700 --> 02:32.220 So anytime you use style this is a string. 02:32.220 --> 02:37.470 And I'll go ahead and say string to string to lower. 02:37.950 --> 02:42.090 Oh I want to remove this just string to lower. 02:42.090 --> 02:48.330 And then we go ahead and uh, list everything right inside there. 02:48.360 --> 02:53.220 Now a war had on refresh this and you can see that everything is in lowercase. 02:53.730 --> 02:59.760 Now you can actually go ahead and, uh, let's go ahead and copy everything we have right in here and 02:59.760 --> 03:02.540 go down here, and I'm going to do that for oppa. 03:02.570 --> 03:12.860 So if I do that for oppa, I'm going to change this from STL to lower to STL to oppa. 03:15.680 --> 03:19.850 So I'm going to save this and I'm going to refresh this I have I just save all. 03:19.850 --> 03:21.740 And the next one is just this one. 03:21.770 --> 03:22.310 All right. 03:22.310 --> 03:27.350 So because everything there is no brick stack tag day, there is no brick tag. 03:27.380 --> 03:29.180 That is why we have everything in one line. 03:29.180 --> 03:32.720 So let me go ahead and, uh, close this other one. 03:32.720 --> 03:36.230 And if I run this, I have just the academy right in here. 03:36.260 --> 03:38.600 So you can see that everything to oppa. 03:38.900 --> 03:47.300 Now what if what if I want to assess only just a wall without assessing academy? 03:48.140 --> 03:49.820 How can you be able to do that? 03:49.850 --> 03:53.300 Walter says only just ignore that assistant academy. 03:53.300 --> 03:57.200 Or maybe you assess only academy without just wall. 03:57.290 --> 03:59.810 No, I will go ahead and, uh. 04:01.390 --> 04:03.790 let's go ahead and echo this out. 04:03.790 --> 04:06.520 So I want to say echo. 04:06.670 --> 04:13.180 And then we go ahead and, uh, create what is called a substring. 04:13.180 --> 04:18.700 So in that case, I want to collect just a portion of a string. 04:18.700 --> 04:21.880 That means I'm collecting a substring right in here. 04:21.910 --> 04:23.830 So I'm going to say so. 04:24.190 --> 04:26.440 And then you add string. 04:26.470 --> 04:28.690 This is a substring in PHP. 04:28.750 --> 04:37.030 And now I'll go ahead and uh input my variable which is my wall. 04:37.060 --> 04:39.130 Then I have to count these. 04:39.160 --> 04:40.510 The first one here is 04:40.510 --> 04:47.500 0123456789 04:47.500 --> 04:48.430 1011. 04:48.460 --> 04:50.830 That means I'm going to start from a. 04:50.860 --> 04:53.200 So I'll go ahead and put 11. 04:53.230 --> 04:55.090 Then put a semicolon at the end. 04:55.090 --> 04:57.940 And let's refresh this academy. 04:58.360 --> 05:04.710 So you can see I was able to get a portion of that strain, which is called a substring, and that is 05:04.740 --> 05:05.370 academy. 05:05.370 --> 05:06.780 So is that academy. 05:06.810 --> 05:14.940 Maybe I want to start from I just want to take only a C, a D, let's say acad. 05:14.970 --> 05:22.350 So that is I'm going to say this started from four. 05:22.380 --> 05:29.520 And if I save this out of fresh I have a cat because I just need only this first four right in here. 05:30.330 --> 05:37.950 Now this is about substring how to, you know, collect some portion of your string. 05:37.980 --> 05:40.740 I'll go ahead and show us another one. 05:40.830 --> 05:44.160 What if you want to calculate the length of this string? 05:44.190 --> 05:51.420 Everything right in the sky let's say echo then STL length. 05:51.450 --> 05:58.560 So if I go ahead I'm going to pass in my variable right in there and go ahead and say this is my wall. 05:58.560 --> 06:01.400 And let's go here, refresh this and check it out. 06:01.400 --> 06:05.480 So it means it is 18 characters that are right in here. 06:05.480 --> 06:08.810 So we have 18 characters right in there. 06:09.500 --> 06:18.050 So you use the SQL Len to be able to check out how many characters you have in a string. 06:18.710 --> 06:24.410 So what if what if I want to get maybe only G. 06:24.650 --> 06:28.940 So anytime you're working with a string, I want us to note this. 06:28.970 --> 06:31.580 The first character I have here is zero. 06:31.610 --> 06:42.290 Next one is next one is one, two, three, four, five, six, seven, eight, nine and so on to 18. 06:42.290 --> 06:44.420 So the very first one is zero. 06:44.450 --> 06:45.590 Now let's go ahead. 06:45.590 --> 06:51.230 And uh, I'm going to comment on this so that it will always be here. 06:52.970 --> 06:54.500 So our first one is zero. 06:54.500 --> 06:59.030 And uh let's go ahead and check it out to make sure we have it. 06:59.030 --> 07:09.280 So echo and I will go ahead and input in my variable my wall. 07:09.670 --> 07:13.900 And then I'm going to pass the index zero of that. 07:13.900 --> 07:21.010 If I pass in index zero then I go ahead and print out only the first one. 07:21.040 --> 07:22.900 Or first is I check it out G. 07:23.560 --> 07:29.410 So you can see I'm able to get G, because that is a first one right in there. 07:29.440 --> 07:37.300 So if I go over here and input one, I refresh and half as a s. 07:37.330 --> 07:42.730 Now remember we input 11 and a got academy. 07:42.760 --> 07:48.310 So if I go back right here and put 11 I'm going to get just a correct out is a refresh. 07:48.310 --> 07:50.320 And that is what we have right in here. 07:50.770 --> 07:56.200 So I believe that this is really making sense to us because we need to know all this. 07:56.230 --> 07:59.700 It helps us in our day to day execution of our programs. 08:00.570 --> 08:03.480 Now there is another wall right in here. 08:03.750 --> 08:07.320 What if I want to change? 08:07.320 --> 08:09.750 Just wall to wall Academy. 08:09.780 --> 08:11.280 To my academy? 08:11.430 --> 08:16.440 Then I will go ahead and use what is called a string replace. 08:16.440 --> 08:23.790 So go ahead and say echo zero underscore replace. 08:24.180 --> 08:31.500 And now I want to be able to replace this wall with moi. 08:31.530 --> 08:36.600 Now I'm going to pass in the first one which is a DST wall. 08:36.990 --> 08:43.110 Then the next argument or the next parameter I'm going to put in here is going to be what you want to 08:43.140 --> 08:46.740 use to replace that first one, which is just a wall. 08:46.770 --> 08:48.840 So that is moi. 08:48.990 --> 08:59.360 And then I'll go ahead and pass in my variable name, which is uh, my wall, because that is the string. 08:59.360 --> 09:01.730 I want this to be executed off. 09:01.730 --> 09:04.490 So go ahead and save this and let's refresh this. 09:04.700 --> 09:05.360 And then what? 09:05.390 --> 09:13.280 Academy are no longer just a war academy, so I hope that is really making sense. 09:13.310 --> 09:16.160 That is really making sense. 09:16.160 --> 09:18.380 So that is really very interesting. 09:18.770 --> 09:25.520 So I believe that everything we are doing right in here is actually making sense to us. 09:25.520 --> 09:32.840 And uh, I believe that, uh, with time, you're going to master everything. 09:32.870 --> 09:44.870 Let me say I want to replace let's say I want to have my I'll go ahead and delete this and save. 09:44.870 --> 09:53.030 And let's refresh this just for a memoir Academy, because I just want to replace only this portion, 09:54.620 --> 09:55.430 you understand? 09:55.460 --> 09:58.100 I want to replace just this portion alone. 09:58.510 --> 10:03.100 So I've replaced the wall with suggestive Memoir Academy. 10:03.190 --> 10:07.510 So if you put everything you have a pleasant everything right in there. 10:07.570 --> 10:09.160 Everything right in there. 10:10.180 --> 10:14.410 Okay, so what if you just wanted a place? 10:14.440 --> 10:19.210 Let me say a half wall, and I want to call this. 10:19.240 --> 10:20.740 Let's go ahead and remove this. 10:20.770 --> 10:24.040 And I want to the place let me say G. 10:26.170 --> 10:29.650 With e let's go ahead and save our refresh. 10:29.680 --> 10:34.150 And we have Estival Academy and no longer Festival Academy. 10:34.150 --> 10:35.980 So we have still four. 10:36.010 --> 10:39.220 Academy because I just want to replace only the G. 10:40.990 --> 10:41.740 You understand? 10:41.740 --> 10:43.990 So I hope that is really very cool. 10:44.350 --> 10:47.590 Now there is one more thing I'm going to show us before we run out. 10:47.620 --> 10:54.790 So when I talked about, uh, the index, you kind of press an index. 10:54.820 --> 10:56.290 Let me say, without. 10:56.320 --> 10:58.800 Going this way, there is something I got to do. 10:58.830 --> 11:04.980 Let me say I have a couple of days, and then I'm going to. 11:05.640 --> 11:06.090 Okay. 11:06.120 --> 11:11.700 Number four, start with a my variable name, which is my. 11:11.700 --> 11:12.330 Whoa. 11:12.330 --> 11:17.970 And then I'm going to pass in in the index I want to replace index zero now. 11:17.970 --> 11:19.590 And that index zero is G. 11:19.680 --> 11:23.880 And then I'll go ahead and say this is equal to. 11:24.450 --> 11:26.220 In the first one I use a e. 11:26.250 --> 11:34.200 Let me go ahead and say I'm going to use um p and then put a semicolon at the end. 11:34.200 --> 11:37.440 And now let's go ahead and equal. 11:38.280 --> 11:44.010 And I'm going to see my work. 11:44.220 --> 11:48.660 Now let's go ahead and refresh this and check it out Steve Wall. 11:49.140 --> 11:53.250 So you can see it two different ways I use to replace the first index. 11:53.250 --> 11:55.560 So you can actually replace any index. 11:55.560 --> 11:58.070 Maybe I want to replace index Nine. 11:58.700 --> 12:02.060 So this guide on refreshes just TiVo P. 12:03.110 --> 12:05.030 So just TiVo P. 12:05.510 --> 12:06.080 All right. 12:06.080 --> 12:07.520 So hope that is cool. 12:07.910 --> 12:12.890 If you repressed index ten which is the character the space the skyline check it out. 12:12.920 --> 12:15.830 We edit P right in between just TiVo Academy. 12:15.830 --> 12:18.890 So instead of that space right in there what is in it. 12:19.280 --> 12:26.630 Uh, that string, which is P right in there, that's character P, because everything is a character, 12:26.660 --> 12:28.250 including a space is a character. 12:28.250 --> 12:31.940 So one of I has been calculating how many characters you have in a string. 12:31.940 --> 12:34.580 It always calculate even the space. 12:34.760 --> 12:37.220 So this is all about string. 12:37.220 --> 12:40.700 And uh, I hope that is really very cool. 12:40.700 --> 12:46.550 So play around with them, try out more on these and uh, check out other resources. 12:46.550 --> 12:51.500 And if you have any questions on these please use the question and answer section. 12:51.500 --> 12:54.170 And I'm going to get back to you as soon as possible. 12:54.170 --> 12:55.130 Thank you so much. 12:55.130 --> 12:58.310 And I'm going to see you in the next video lecture.