PHP Fundamentals

Chapter 6: Control Structures

6.1 Conditional Statements

Control program flow based on conditions.

if ($age >= 18) {
    echo "Adult";
} elseif ($age >= 13) {
    echo "Teenager";
} else {
    echo "Child";
}

6.2 Switch Statements

switch ($day) {
    case "Monday":
        echo "Start of week";
        break;
    case "Friday":
        echo "End of week";
        break;
    default:
        echo "Midweek";
}

6.3 Loops

Repeat code execution.

// For loop
for ($i = 0; $i < 10; $i++) {
    echo $i;
}

// While loop
while ($i < 10) {
    echo $i;
    $i++;
}

// Foreach loop (for arrays)
foreach ($array as $value) {
    echo $value;
}