Do While statement is same as the while statement, the only difference is that it evaluates the expression at the end.

    do	
      {
       Statements
      }while (expr1);

In do while, the statements are executed first, then the expr1 is checked, only drawback of Do While is that it may execute statements once even if the condition is false.

     <?php
     $c =1;
     do {
         echo $c;
        }
     while ($c>5);
     ?>

In the above example the value of $c should be displayed only if its greater than 5,but using the Do while statement it displays the value of $c as 1 first and then checks the expression or condition.

    <?php
    $c = 6;
    do 
     {
      if ($c>5)
       {
        echo "Enter the a value less than 5";
        break;
       }
     }
    while ($c<5);
    ?>

Use the "Break" statement to terminate the code execution in a loop