# Reading JSON Files

• Count the number of items in an array
  • PHP
• Sum the values of an array
  • PHP
    • Multi-dimensional array
• Merge two arrays
  • PHP

# Count the number of items in an array

# PHP

Not to be confused with array_sum which sums the values of an array.

$values = [5, 3, 7];
$count = count($values);

# Sum the values of an array

# PHP

$values = [5, 3, 7];
$sum = array_sum($values);

# Multi-dimensional array

$cart = [
    'items' => [
        '5' => [
            'qty' => 11,
        ],
        '9' => [
            'qty' => 2,
        ],
    ],
];

$totalQty = array_sum(array_column($cart['items'], 'qty'));

# Merge two arrays

# PHP

$first = ['a', 'b', 'c'];
$second = ['d', 'e', 'f'];
$merged = array_merge($first, $second);