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Introduction to PHP

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Associative Arrays

Associative arrays in PHP are arrays that provide a mapping between keys and values. They are used to store data in the form of key-value pairs, where each key is unique and associated with a specific value.

Creation Syntax

Associative arrays are created using the key operator => to establish the relationship between the key and the value. For example:

php

main

copy
$user = [
"name" => "John",
"age" => 30,
"city" => "New York"
];

              
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$user = [
    "name" => "John",
    "age" => 30,
    "city" => "New York"
];

As a result, this code creates an associative array $user with three keys: "name", "age", and "city", and their corresponding values: "John", 30, and "New York". You can access these values using their respective keys:

php

main

copy
<?php
$user = array(
"name" => "John",
"age" => 30,
"city" => "New York"
);

echo $user["name"]; // Output "John"
?>

              
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<?php
$user = array(
    "name" => "John",
    "age" => 30,
    "city" => "New York"
);

echo $user["name"]; // Output "John"
?>
Taak

Swipe to start coding

Fill in the blanks in the code to create an associative array $person with three key-value pairs (e.g., 'name' => 'John', 'age' => 25, 'profession' => 'Engineer'). Then, access the value by the key 'name' and print it to the screen.

Oplossing

<?php
$person = [
'name' => 'John',
'age' => 25,
'profession' => 'Engineer'
];

echo 'Name: ' . $person['name'];
?>

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Sectie 4. Hoofdstuk 3
<?php
// Fill in the blanks to create an associative array with three key-value pairs
$person = [
___ => 'John',
'age' ___ 25,
'profession' => ___
];

// Access the value by the key 'name' and print it to the screen
echo 'Name: ' . $person[___];
?>

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