Percabangan if/else/switch

if Sederhana

<?php
$nilai = 80;
if ($nilai >= 75) {
    echo "Lulus";
}
?>

if / else

<?php
$umur = 16;
if ($umur >= 17) {
    echo "Boleh punya KTP";
} else {
    echo "Belum cukup umur";
}
?>

if / elseif / else

<?php
$nilai = 78;
if ($nilai >= 85) {
    $grade = "A";
} elseif ($nilai >= 70) {
    $grade = "B";
} elseif ($nilai >= 55) {
    $grade = "C";
} else {
    $grade = "D";
}
echo "Grade: $grade";
?>

switch

Cocok untuk banyak nilai diskrit:

<?php
$hari = "Senin";
switch ($hari) {
    case "Senin":
        echo "Awal pekan, semangat!";
        break;
    case "Jumat":
        echo "Hampir weekend!";
        break;
    case "Sabtu":
    case "Minggu":
        echo "Libur!";
        break;
    default:
        echo "Hari biasa";
}
?>

Operator Ternary (Singkat)

<?php
$umur = 20;
$status = ($umur >= 17) ? "dewasa" : "anak";
echo $status;
?>

Null Coalescing ??

<?php
$nama = $_GET['nama'] ?? "Tamu";
echo "Halo, $nama";
?>