php - do while loop

php - do while loop

A "do while" loop is a slightly modified version of the while loop. If you 

recal from one of the previous lessons on While Loops the conditional 

statement is checked comes back true then the code within the while 

loop is executed. If the conditional statement is false then the code 

within the loop is not executed.

On the other hand, a do-while loop always executes its block of code at 

least once. This is because the conditional statement is not checked 

until after the contained code has been executed.

php - while loop and do while loop contrast

 

A simple example that illustrates the difference between these two loop types is a conditional statement that is always false. First the while loop:

PHP Code:

$cookies = 0;

while($cookies > 1){

        echo "Mmmmm...I love cookies! *munch munch munch*";

}

As you can see, this while loop's conditional statement failed (0 is not greater than 1), which means the code within the while loop was not executed. Now, can you guess what will happen with a do-while loop?

PHP Code:

$cookies = 0;

do {

                echo "Mmmmm...I love cookies! *munch munch munch*";

} while ($cookies > 1);