The while Loop in PHP

The while loop allows you to execute a block of code a specified number of times.

Let's use while as an example to output a string of numbers from 1 to 9. To do this, the loop must iterate 9 times.

See the example solution below, followed by an analysis:

<?php
	$i = 1;
	while ($i <= 9) {
		echo $i;
		$i++;
	}
?>

Code execution result:

123456789

Example Analysis

To solve the problem, a counter variable is introduced, most often called $i. This variable is assigned an initial value before the loop, in our case 1.

Then the loop termination condition is set, in our case, it is the condition $i <= 9. It means that the loop continues as long as $i is less than or equal to 9.

Inside the loop, we must increment the counter variable so that the loop eventually stops. In our case, we will increase $i by 1 using the command $i++.

The while Loop in PHP

Example Analysis

See Also