PHP Do-While Loop

The do-while loop in PHP is similar to the while loop, but it ensures the code inside the loop runs at least once before checking the condition.

Syntax of a PHP Do-While Loop

<?php
do {
    // Code to be executed
} while (condition);
?>

📝 Example 1: Simple Do-While Loop

Prints numbers from 1 to 5.

<?php
$i = 1;
do {
    echo "Number: $i <br>";
    $i++;
} while ($i <= 5);
?>

Try It Now

📝 Example 2: Do-While Loop That Runs at Least Once

Executes at least once, even if the condition is false.

<?php
$i = 10;
do {
    echo "This will print once, even if condition is false. <br>";
} while ($i < 5);
?>

Try It Now

📝 Example 3: Do-While Loop with User Input

Keep asking for user input until they enter "exit" (Assuming input is simulated).

<?php
do {
    $input = readline("Enter something (type 'exit' to stop): ");
    echo "You entered: $input <br>";
} while ($input != "exit");
?>

Try It Now

🎯 When to Use a Do-While Loop?

  • When you need the loop to execute at least once.
  • When working with user input validation.
  • For tasks requiring an initial execution before condition checking.

📝 Practice Time!

Modify the examples above and experiment with different conditions to understand how do-while loops work.