PHP array (For demonstration purpose only)

array.php

<?php

// For demonstration purpose only

// Arrays
$names = ['clement', 'tomy', 'jacques'];
print_r($names);
echo $names[0];

$people = [
    'Clement' => [
        'name' => 'Barbaza',
        'first_name' => "Clément",
        'email' => 'clement@webstart.com',
        'classes' => ['dev 2', 'dev 3'],
    ],
    'Tomy' => [
        'name' => 'Spagnoletti',
        'first_name' => 'Tomy',
        'email' => 'tomy@webstart.com',
        'classes' => ['dev 1', 'dev 2'],
    ]
];
print_r($people);
echo $people['clement']['email'];

// Counting
echo count($names);
echo sizeof($names);
$count = array_count_values($names);
print_r($count);
echo count($people);

// Loops
foreach($people as $key => $person) {
    echo $key . ' ' . $person['name'] . ': ' . $person['email'] . "\n";
    foreach ($person['classes'] as $class) {
        echo $class . "\n";
        break 2;
    }
    echo "\n";
}

// In array
$in = in_array('tomy', $names);
print_r($in);

// Explode
$allowed = ['jpg', 'jpeg', 'png'];
$filename = 'image.bmp';
$parts = explode('.', $filename);
$extension = end($parts); // $parts[1];
if (in_array($extension, $allowed)) {
    echo 'Upload authorized';
}

// Implode
$string = implode(', ', $allowed);
echo $string;

// Keys
$array = ['clement' => 31, 'tomy' => 81, 'jacques' => 75];
$keys = array_keys($array);
print_r($keys);

// Mapping
foreach($people as $person) {
    echo $person['first_name'] . ' ' . $person['name'] . "\n";
}
$people = array_map(function($person) {
    $person['full_name'] = $person['first_name'] . ' ' . $person['name'];
    return $person;
}, $people);
print_r($people);

// Sum
$numbers = [1, 2, 3, 4];
echo array_sum($numbers);

// Filters
$users = [
    ['username' => 'clement', 'score' => 0],
    ['username' => 'tomy', 'score' => 0],
    ['username' => 'jacques', 'score' => 50],
];
$users = array_filter($users, function($user) {
    if ($user['score'] > 0) {
        return true;
    }
});
print_r($users);

// Walk
array_walk($users, function(&$user, $index) {
    $user['username'] = 'Michel';
    return $user;
});
print_r($users);

function changeName(&$user, $index) {
    $user['username'] = 'Michel';
    return $user;
}
array_walk($users, 'changeName');
print_r($users);

// Sorting
$names = ['Clement', 'Tomy', 'Jacques'];
$numbers = [1, 8, 4, 12, 13, 53];
sort($names);
rsort($names);
print_r($names);
$names = ['Clement' => 33, 'Tomy' => 32, 'Jacques' => 35];
asort($names);
arsort($names);
print_r($names);
array_multisort($numbers, SORT_DESC);
print_r($numbers);
$files = ['img12.png', 'img10.png', 'img2.png', 'img1.png'];
array_multisort($files, SORT_NATURAL);
print_r($files);

// Push and pop
$names = ['Clement', 'Tomy', 'Jacques'];
$names[] = 'Michel';
$names[] = 'Julie';
array_push($names, 'Michel', 'Julie');
print_r($names);
$popped = array_pop($names);
print_r($popped);

// Reduce
$items = [
    ['price' => 5],
    ['price' => 2],
    ['price' => 10],
];
$total = array_reduce($items, function ($cart, $item) {
    if (!$cart) {
        return $item;
    }
    $cart['price'] += $item['price'];
    return $cart;
});
print_r($total['price']);

// Random
$random = rand(0, 2);
$randomName = $names[$random];
echo $randomName;
$randomKey = array_rand($names, 1);
echo $randomKey;
echo $names[$randomKey];

// Merge arrays
$otherNames = ['Julien', 'Romain', 'Vincent'];
$allNames = array_merge($names, $otherNames);
print_r($allNames);