? PHP If Elseif Statement

? Quick Overview

The if...elseif...else statement in PHP allows checking multiple conditions in sequence. Only the first true condition executes, and the remaining conditions are skipped.

? Key Concepts

Conditions are evaluated from top to bottom
Only one block executes per decision chain
Useful for grading systems, ranges, and decision trees

⚙️ Syntax / Theory

? View Syntax Structure

// PHP if-elseif-else syntax structure
<?php
if (condition1) {
    // Executes when condition1 is true
} elseif (condition2) {
    // Executes when condition2 is true
} else {
    // Executes when all conditions are false
}
?>

? Code Example

? View Code Example

// Determine grade based on marks
<?php
$marks = 75;

if ($marks >= 90) {
    echo "Grade: A";
} elseif ($marks >= 75) {
    echo "Grade: B";
} elseif ($marks >= 60) {
    echo "Grade: C";
} else {
    echo "Grade: F";
}
?>

? Live Output / Explanation

Output

Grade: B

The condition $marks >= 75 evaluates to true, so PHP prints Grade: B and ignores the remaining conditions.

? Live Grade Simulator

Adjust the marks to see how PHP evaluates each condition sequentially.

Enter Marks (0-100):

if ($marks >= 90) { echo "Grade: A"; }

elseif ($marks >= 75) { echo "Grade: B"; }

elseif ($marks >= 60) { echo "Grade: C"; }

else { echo "Grade: F"; }

Result: Grade B

? Interactive Logic Flow

This logic works like a vertical decision ladder where PHP stops at the first true condition and exits the chain.

? Use Cases

Student grading systems
Salary tax slabs
Discount calculation
User role validation

✅ Tips & Best Practices

Order conditions from most specific to least specific
Use elseif instead of multiple if blocks
Always include an else for fallback handling

? Try It Yourself

Create grade_check.php
Change the marks value
Observe how different grades are displayed