Arrays

<?php
$liste = ["Apfel", "Birne", "Kirsche"];
$person = ["name" => "Mia", "alter" => 17, "hobbys" => ["Lesen", "Judo"]];

echo $liste[0], " ", $person["name"], " ", $person["hobbys"][1], " ", count($liste), "\n";
$liste[] = "Dattel";                 // anhängen
$person["ort"] = "Berlin";            // hinzufügen
unset($liste[1]);                     // entfernen (Schlüssel bleiben!)
print_r($liste);
print_r(array_values($liste));        // neu durchnummerieren
var_dump(isset($person["ort"]), array_key_exists("alter", $person), in_array("Judo", $person["hobbys"]));

<?php
$z = [5, 3, 9, 1];
array_push($z, 7);                    // am Ende
array_unshift($z, 0);                 // am Anfang
echo array_pop($z), array_shift($z), " ", implode(",", $z), "\n";
echo array_sum($z), " ", max($z), " ", min($z), " ", count($z), " ", array_product([2, 3]), "\n";
sort($z);        echo implode(",", $z), "\n";
rsort($z);       echo implode(",", $z), "\n";
echo implode(",", array_reverse($z)), " ", implode(",", array_slice($z, 1, 2)), "\n";
$z2 = [1, 2, 3, 4, 5];
array_splice($z2, 1, 2, ["x"]);       // ersetzt 2 Elemente ab Index 1
echo implode(",", $z2), "\n";
echo implode(",", array_unique([1, 2, 2, 3, 1])), " ", implode(",", array_merge([1], [2, 3])), " ", implode(",", [...[1, 2], ...[3]]), "\n";
echo array_search(9, [5, 9, 1]), " ", implode(",", array_fill(0, 3, "x")), " ", implode(",", array_pad([1], 3, 0)), "\n";
print_r(array_chunk([1, 2, 3, 4, 5], 2));
print_r(array_combine(["a", "b"], [1, 2]));
print_r(array_count_values(["x", "y", "x"]));

<?php
$preise = ["Brot" => 2.5, "Milch" => 1.2, "Käse" => 4.0];
print_r(array_keys($preise));
print_r(array_values($preise));
asort($preise);   print_r($preise);          // nach Wert sortieren, Schlüssel behalten
ksort($preise);   print_r($preise);          // nach Schlüssel
arsort($preise);  echo implode(",", array_keys($preise)), "\n";
print_r(array_flip(["a" => 1, "b" => 2]));
print_r(array_merge(["a" => 1, "b" => 2], ["b" => 3, "c" => 4]));
print_r(["a" => 1, "b" => 2] + ["b" => 9, "c" => 3]);     // + behält links
foreach ($preise as $produkt => $preis) printf("%-6s %5.2f\n", $produkt, $preis);

<?php
$z = [1, 2, 3, 4, 5, 6];
print_r(array_map(fn($x) => $x * $x, $z));
print_r(array_filter($z, fn($x) => $x % 2 === 0));              // behält Schlüssel
print_r(array_values(array_filter($z, fn($x) => $x > 4)));
echo array_reduce($z, fn($summe, $x) => $summe + $x, 0), "\n";
print_r(array_filter(["a" => 1, "b" => 5], fn($v, $k) => $v > 2 && $k !== "x", ARRAY_FILTER_USE_BOTH));
print_r(array_map(null, [1, 2], ["a", "b"]));                    // zip
usort($z, fn($a, $b) => $b <=> $a);                              // eigene Sortierung
echo implode(",", $z), "\n";
$personen = [["n" => "Tom", "a" => 30], ["n" => "Mia", "a" => 17], ["n" => "Zoe", "a" => 17]];
usort($personen, fn($a, $b) => [$a["a"], $a["n"]] <=> [$b["a"], $b["n"]]);
echo implode(",", array_column($personen, "n")), "\n";
print_r(array_column($personen, "a", "n"));

<?php
$matrix = [[1, 2, 3], [4, 5, 6]];
echo $matrix[1][2], "\n";
foreach ($matrix as $zeile) echo implode(" ", $zeile), "\n";
$kunden = [
    ["name" => "Mia", "punkte" => 120],
    ["name" => "Tom", "punkte" => 80],
];
foreach ($kunden as ["name" => $n, "punkte" => $p]) echo "$n: $p\n";
echo json_encode(array_map(null, ...$matrix)), "\n";             // transponieren