while statement

while means while. It is a loop statement like the for statement. It is used to repeat something.
The syntax is different from the for statement.
The while statement first declares a variable.
After that, we write a while(condition)
Enter the increment value in the statement.
As a source

$num = 1;   //Variable declaration
while($num <= 10){  //do the following while num is less than or equal to 10 

    echo "{$num} output............... {$a} <br />"; // Do this sentence

    $num++  //Here's the run. When executed, the num value becomes 2, and then back to the while statement, the result is true and the following is repeated.

}

Now type the output directly from 1 to 10 with the while statement !!!

<?php
    $num = 1;

    while($num <= 10){
        echo " $num ";
        $num++;
    }
?>

if so!! Now output the odd sum from 1 to 10 using the while statement.

<?php
    echo "Sum of odd numbers from 1 to 10<br />";

    $num = 1;  // Initial value declaration
    $sum = 0;  // Declaration of Variables in Cumulative Totals

    while($num <= 10){
        echo $num."Cumulative sum to";
        $sum += $num;
        $num+=2;
        echo " = {$sum} <br />";
    }

    echo "The cumulative sum of odd numbers 1 through 10 is {$sum}.<br />";
?>

Declare an initial value of 1 for num.
Then we declare sum to accumulate the sum of odd numbers from 1 to 10.

Set the condition to 10 with the while statement

Accumulate the value of num in $sum. num is currently 1, so sum is 1.
After that, the value of num is +2. Then num becomes 3.
Going back to while and running as above, 1 3 5 7 9 accumulates in sum.

If you accumulate multiples of 5 from 1 to 100,
Set the condition of the while statement to 100
$num += 5