Simple Array Example PHP

<?php
// Using array() to construct an array:
$prime_numbers = array(2, 3, 5, 7, 11, 13, 17);

// Using short array syntax:
$animals = ["dog", "cat", "turtle", "cow"];

// Printing with print_r():
print_r($prime_numbers);

echo "\n\n";

// Printing with echo and implode()
echo implode(", ", $animals);

// Adding an element with square brackets:
$prime_numbers[] = 19;

// Accessing an array element:
$favorite_animal = $animals[0];
echo "\nMy favorite animal: " . $favorite_animal;

// Reassigning an element:
$animals[1] = "tiger";

// Using array_pop():
echo "\nBefore pop: " . implode(", ", $animals);
array_pop($animals);
echo "\nAfter pop: " . implode(", ", $animals);

// Using array_push():
echo "\nBefore push: " . implode(", ", $prime_numbers);
array_push($prime_numbers, 23, 29, 31, 37, 41);
echo "\nAfter push: " . implode(", ", $prime_numbers);

//Using array_shift():
echo "\nBefore shift: " . implode(", ", $animals);
array_shift($animals);
echo "\nAfter shift: " . implode(", ", $animals);

//Using array_unshift():
echo "\nBefore unshift: " . implode(", ", $animals);
array_unshift($animals, "horse", "zebra", "lizard");
echo "\nAfter unshift: " . implode(", ", $animals);

//Using chained operations with nested arrays:
$treasure_hunt = ["garbage", "cat", 99, ["soda can", 8, ":)", "sludge", ["stuff", "lint", ["GOLD!"], "cave", "bat", "scorpion"], "rock"], "glitter", "moonlight", 2.11];

echo "\nWe found " . $treasure_hunt[3][4][2][0];