Arrays

Indexed arrays

Arrays can hold ordered lists.

<?php
$colors = ["red", "green", "blue"];
echo $colors[1], "\n";
$colors[] = "yellow";

Associative arrays

String keys create map-like structures.

$user = [
  "name" => "Ada",
  "lessons" => 4,
];
echo $user["name"], "\n";

Loop with foreach

foreach is the everyday tool for arrays.

foreach ($user as $key => $value) {
  echo "$key=$value\n";
}

Array helpers

• count for length
• in_array to search values
• array_key_exists for keys
• print_r / var_dump for debugging