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Introduction to PHP

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Strings

Strings are used to represent textual information and can be defined within single ' ' or double " " quotes.

main.php

main.php

copy
<?php
$name = "John";
$message = 'Hello, World!';
?>

              
1234

            
<?php
$name = "John";
$message = 'Hello, World!';
?>

Strings can contain any characters, including letters, digits, and special symbols.

String Concatenation

Concatenation in PHP is used to join strings together into one string. The concatenation operator . (dot) is used for this purpose:

main.php

main.php

copy
<?php
$firstName = "John";
$lastName = "Doe";

$fullName = $firstName . " " . $lastName; // `$fullName` will be `"John Doe"`
echo $fullName;
?>

              
1234567

            
<?php
$firstName = "John";
$lastName = "Doe";

$fullName = $firstName . " " . $lastName;  // `$fullName` will be `"John Doe"`
echo $fullName;
?>

The code above defines two variables, $firstName and $lastName, with values "John" and "Doe" respectively. It concatenates them into $fullName using the dot operator and then outputs the full name "John Doe" using echo.

Using Single and Double Quotes

You can use both '(single) and "(double quotes) to define strings. They have some differences in how they handle variables and special characters.

Double quotes allow variables to be directly used within the string and support escaping special characters:

main.php

main.php

copy
<?php
$name = "John";
$message = "Hello, $name!";

echo $message;
?>

              
123456

            
<?php
$name = "John";
$message = "Hello, $name!";

echo $message;
?>

Single quotes treat everything inside them as literal text, ignoring variables and special characters:

main.php

main.php

copy
<?php
$name = "John";
$message = 'Hello, $name!';

echo $message;
?>

              
123456

            
<?php
$name = "John";
$message = 'Hello, $name!';

echo $message;
?>
Opgave

Swipe to start coding

  1. Assign any name to the variable $name.

  2. Concatenate the strings using the . operator so that running the code outputs the greeting "Hello, SomeName!".

Løsning

<?php
$name = "Alex";

$greeting = "Hello, " . $name . "!";
echo $greeting;
?>

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 3
single

single

<?php
$name = "___";

$greeting = "Hello, " ___ $name ___ "!";
echo $greeting;
?>

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