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Introduzione a PHP
Sezione 5. Capitolo 2
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While-Loops

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A while loop is a programming construct that allows you to execute a specific block of code as long as a certain condition is true.

The syntax for a while loop in PHP is as follows:

while (condition) { 
// Statements to be executed while a condition is true 
}

  • First, before entering the loop, the condition (which is enclosed in parentheses) is checked. If this condition is true, then the code inside the loop is executed;

  • After executing the code inside the loop, the condition is checked again. If the condition is still true, the loop is executed again. This process continues until the condition becomes false;

  • Once the condition becomes false, the execution of the loop stops, and the program moves on to the code after the loop.

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Note
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It is important to remember that while loops can be infinite if the condition never becomes false.
Always check the condition carefully to avoid infinite loops.

main.php

main.php


              
1234567

            
<?php
$counter = 0;
while ($counter < 5) {
    echo $counter;
    $counter = $counter + 1;
}
?>

The while loop will repeat as long as the value of the variable counter is less than 5. The loop will repeat five times since the variable counter is initialized to 0. Each time the loop repeats, the value of the variable counter will be incremented by 1.

Compito

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Fill in the blanks in the code to create a while loop that calculates the sum of numbers from 1 to 10.

  1. The variable $sum is initialized with 0 to store the total sum.
  2. The variable $number is initialized with 1 to start counting from 1.
  3. Complete the while condition so that the loop continues as long as $number is less than or equal to 10.
  4. Inside the loop, add the current value of $number to $sum using the += operator.
  5. Increment $number by 1 in each iteration to move to the next number.

Soluzione

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Sezione 5. Capitolo 2
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