PHP do while loop

Description

The PHP do...while construct is similar to a while loop. The difference is that the do...while loop is executed at least once.

Syntax

The do while loop has the following syntax.

do{
  loop body
}while(condition is true);

Example

Consider the following piece of code:

<?php//from  www  .  j  a v  a 2 s .c  om
        $i = 1;
        do {
                print "Number $i\n";
        } while ($i < 10);
?>

The code above generates the following result.

Example rewrite

In comparison, that same code could be written using a while loop:

<?php/* w w w  . j a v a2s  .c  om*/
        $i = 1;
        while ($i < 10) {
                print "Number $i\n";
        }
?>

The difference is that the while loop would output nothing, because it checks the value of $i before entering the loop. Therefore, do...while loops are always executed a minimum of once.

The code above generates the following result.