Indexed Lookup

An indexed array lookup reads one value by its zero-based position.

indexed_lookup.php

<?php
$index = ;
$value = [4, 8, 12][$index];
$doubled = $value * 2;

echo "index=" . $index . "\n";
echo "value=" . $value . "\n";
echo "doubled=" . $doubled . "\n";

<?php
$index = ;
$value = [4, 8, 12][$index];
$doubled = $value * 2;

echo "index=" . $index . "\n";
echo "value=" . $value . "\n";
echo "doubled=" . $doubled . "\n";

<?php
$index = ;
$value = [4, 8, 12][$index];
$doubled = $value * 2;

echo "index=" . $index . "\n";
echo "value=" . $value . "\n";
echo "doubled=" . $doubled . "\n";

index An index is the numeric position used to choose a value from an array.