PHP Control Statements: Guide to Conditional Statements and Loops

Nested if statements allow you to place one if...else structure inside another if or else block, creating a more complex decision-making flow. This is useful when you need to check multiple conditions that depend on each other.

Basic Syntax of Nested if

if (condition1) {
    // Code to execute if condition1 is true
    if (condition2) {
        // Code to execute if both condition1 and condition2 are true
    } else {
        // Code to execute if condition1 is true and condition2 is false
    }
} else {
    // Code to execute if condition1 is false
}

Example

<!DOCTYPE html>

<html>

<body>

<?php

$age = 20;

$hasID = true;

if ($age >= 18) {

// Nested if inside the first if

if ($hasID) {

echo "You are allowed entry.";

} else {

echo "You need an ID to enter.";

}

} else {

echo "You are too young to enter.";

}

</body>

</html>

Try it yourself

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