IF Statements

Program branching

if, elseif, and else enable different execution paths. The condition must be an expression that evaluates to bool. For short checks, use the ternary operator ?:. A guard clause – early return – often makes code more readable than deeply nested if statements.

Validation example

Check whether the email is empty before submitting the form; display an error message next to the field.

<?php
$godine = 17;
if ($godine >= 18) {
    echo "Punoletan";
} else {
    echo "Maloletan";
}

Branching in practice

Model a user age check for content access (e.g. 18+). Add a branch for invalid input.

<?php
$godine = (int) ($_POST["godine"] ?? 0);
if ($godine >= 18) {
    echo "Pristup dozvoljen";
} elseif ($godine > 0) {
    echo "Morate imati 18+ godina";
} else {
    echo "Unesite validan broj";
}