<?php

// Here we create an array $a that will hold 5 integers.
// By default, PHP arrays are zero-indexed.
$a = array_fill(0, 5, 0);
echo "emp: " . json_encode($a) . "\n";

// We can set a value at an index using the
// array[index] = value syntax, and get a value with
// array[index].
$a[4] = 100;
echo "set: " . json_encode($a) . "\n";
echo "get: " . $a[4] . "\n";

// The count() function returns the length of an array.
echo "len: " . count($a) . "\n";

// Use this syntax to declare and initialize an array
// in one line.
$b = [1, 2, 3, 4, 5];
echo "dcl: " . json_encode($b) . "\n";

// In PHP, you don't need to specify the size of the array
// when initializing it. It will automatically adjust.
$b = [1, 2, 3, 4, 5];
echo "dcl: " . json_encode($b) . "\n";

// PHP doesn't have a direct equivalent to Go's index-based
// initialization, but we can achieve a similar result:
$b = array_fill(0, 5, 0);
$b[0] = 100;
$b[3] = 400;
$b[4] = 500;
echo "idx: " . json_encode($b) . "\n";

// Array types in PHP are flexible and can hold different types.
// Here's an example of a 2D array:
$twoD = array(
    array(0, 1, 2),
    array(1, 2, 3)
);
echo "2d: " . json_encode($twoD) . "\n";

// You can also create and initialize multi-dimensional
// arrays at once.
$twoD = [
    [1, 2, 3],
    [1, 2, 3]
];
echo "2d: " . json_encode($twoD) . "\n";