? PHP Do While Loop

? Quick Overview

The do...while loop in PHP executes a block of code at least once before checking the condition. This makes it ideal when an operation must run initially regardless of the condition.

? Key Concepts

Condition is checked after execution
Guaranteed single execution
Useful for user-driven workflows

⚙️ Syntax / Theory

? View Code Example

// Basic structure of a PHP do...while loop
do {
echo "Code executes at least once";
} while (condition);

? Code Example

? View Code Example

// Print numbers from 1 to 5 using do...while
<?php
$count = 1;
do {
echo "Count is: $count<br>";
$count++;
} while ($count <= 5);
?>

? Live Output / Explanation

Count is: 1
Count is: 2
Count is: 3
Count is: 4
Count is: 5

The loop runs first, then checks the condition. Even if $count started above 5, the loop would still execute once.

? Interactive Example

Test the loop behavior. If you enter a number greater than 3, notice it still runs once because the condition is checked after the first iteration.

Start $i at:

Result will appear here... (Condition: $i <= 3)

? Use Cases

Menu-driven programs
Input validation loops
Retry mechanisms

✅ Tips & Best Practices

Always update the loop variable
Ensure the condition becomes false
Prefer do...while when one execution is mandatory

? Try It Yourself

Create do_while_loop.php
Ask user input and repeat until positive number
Modify conditions to observe behavior