WEBVTT 00:00.380 --> 00:03.830 Let me show you another variant of the while loop. 00:03.830 --> 00:07.100 This time it can be called do while and. 00:07.100 --> 00:14.120 The difference between this while loop that we've seen previously is that in the case of the do while 00:14.120 --> 00:24.140 loop, the statements, the loop body is always executed at least once and only repeated if the expression 00:24.140 --> 00:25.340 returns true. 00:25.370 --> 00:28.220 So that's the main difference with the while loop. 00:28.220 --> 00:34.130 The expression needs to be true first for the body to run with the do while loop. 00:34.160 --> 00:39.050 The body runs first once and is repeated. 00:39.050 --> 00:44.030 If this condition, the expression in the condition returns true. 00:44.180 --> 00:46.130 Let's see a fun example. 00:47.480 --> 00:49.760 So first let's create a new file. 00:49.760 --> 00:56.990 Let's call it do while PHP and open it immediately add a PHP tag. 00:57.020 --> 01:01.850 So as an example we're going to create a simple dice roll game. 01:02.210 --> 01:04.430 So let's begin with the syntax. 01:04.430 --> 01:09.860 It starts with this do keyword followed by the curly braces. 01:09.860 --> 01:13.820 And that's the loop body. 01:14.360 --> 01:19.700 And the condition goes after this last curly brace. 01:19.700 --> 01:29.570 And only then you write while and here goes the condition the expression okay so dice roll game. 01:30.530 --> 01:33.290 We need to pick a random number. 01:33.890 --> 01:38.990 So let me define a dice roll variable inside. 01:39.890 --> 01:46.160 So again I'm going to use a function I know I haven't explained that yet, but without using some of 01:46.160 --> 01:51.530 the things explained in the future, those examples would be pretty dull. 01:51.530 --> 01:53.840 So you just need to bear with me. 01:53.840 --> 02:00.980 This code right here basically picks a random number between 1 and 6. 02:01.340 --> 02:02.240 Okay. 02:02.360 --> 02:06.530 Um, so we need to tell the user what's his role. 02:06.530 --> 02:17.180 So you rolled a and we can also immediately just output this variable inside double quotes. 02:18.140 --> 02:19.910 Add a new line character. 02:20.540 --> 02:20.990 Okay. 02:20.990 --> 02:23.930 So at this point we know what's our role. 02:23.960 --> 02:26.360 If someone rolls six. 02:26.810 --> 02:34.460 Remember about using the value on the left side of comparison to be super safe. 02:37.400 --> 02:38.270 Like that. 02:38.300 --> 02:47.810 We say congrats, you hit the jackpot. 02:48.920 --> 02:54.020 Okay, new line and let's add some celebration icon. 02:57.050 --> 02:58.370 Maybe this. 02:58.730 --> 02:59.660 All right. 02:59.690 --> 03:00.980 Semicolon. 03:00.980 --> 03:04.070 And what's next? 03:04.370 --> 03:09.560 Next we need to ask if the guy wants to roll again. 03:09.860 --> 03:11.390 So we ask a question. 03:11.390 --> 03:12.560 Roll again. 03:12.560 --> 03:16.070 And the answers we accept is yes or no. 03:16.070 --> 03:19.040 So it needs to be lowercase. 03:19.070 --> 03:23.630 And then let's add another variable. 03:23.630 --> 03:27.350 And again here we're going to get the input from the user. 03:27.350 --> 03:29.900 So you've seen that in previous examples. 03:29.900 --> 03:34.970 So there are some function calls like trim to remove the white spaces. 03:34.970 --> 03:41.120 And f gets with SD in to just accept some console input. 03:41.210 --> 03:43.910 And now the condition. 03:43.910 --> 03:47.750 So we only want this to run again if. 03:50.090 --> 03:56.390 Y equals roll again Let's go through this loop again. 03:56.390 --> 03:57.170 The code. 03:57.170 --> 04:04.640 The loop body will always run at least once, so we roll. 04:04.670 --> 04:06.830 We display the result. 04:06.980 --> 04:13.580 We say if someone hit a jackpot and we ask if he wants to roll again. 04:14.300 --> 04:15.830 Now to this roll again. 04:15.860 --> 04:24.200 We just take the user input from the command line and if he typed y then we let him roll again. 04:24.350 --> 04:32.240 So this body will run again, and the guy will be asked for the subsequent rolls until he quits. 04:32.750 --> 04:36.170 So let's save the changes and let's run it. 04:36.200 --> 04:37.460 So this is do while. 04:37.670 --> 04:38.090 PHP. 04:38.390 --> 04:40.220 Okay, so I rolled one. 04:40.760 --> 04:42.050 Let's try again. 04:42.920 --> 04:44.120 There is the jackpot. 04:44.120 --> 04:51.320 And if I choose no or basically any other character, to be honest, the game just quits.