PHP: Statements
A statement is a command given to a computer to do something. Code in PHP is a collection of instructions, usually separated from each other by a ;.
Here's an example of some code with two statements.
<?php
print_r('Mother of Dragons. ');
print_r('Dracarys!');
When you run this code, two sentences are displayed in sequence:
Mother of Dragons. Dracarys!
Theoretically, the instructions can be written one after the other without moving them to a new line:
<?php
print_r('Mother of Dragons.'); print_r('Drakarys!');
But it's considered bad practice as it's difficult to read.
Why is it important to know? A statement is a unit of execution. The interpreter is a program that runs the code in PHP and executes the instructions strictly in order. An interpreter's principle of operation is (approximately) as follows. It reads the file with the code, splits the code into statements, and then executes them.
Instructions
Print these three names, one after the other: Robert, Stannis, Renly. As a result, the editor should print:
RobertStannisRenly
Use a print_r() call for each name.
Definitions
- The interpreter
- is a program that runs the code in PHP.
- An instruction (statement)
- is a command for a computer written in a programming language. PHP code is a set of instructions separated (most often) by a `;`.
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
My code is different from the teacher's one 🤔
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
I've read the lessons but nothing is clear 🙄
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.
Your exercise will be checked with these tests:
1<?php // phpcs:ignore PSR1.Files.SideEffects
2
3namespace HexletBasics\Basics\Instructions;
4
5use PHPUnit\Framework\TestCase;
6
7\HexletBasics\Functions\runScript();
8
9class Test extends TestCase
10{
11 public function test()
12 {
13 $expected = 'RobertStannisRenly';
14 $this->expectOutputString($expected);
15 require 'index.php';
16 }
17}
18Teacher's solution will be available in:
