PHP contains a various statement types Conrol structures allow us to manage script to do or not to do anything. When you use do while control structure, script does its job until condition turns false. When you use do while script statement once, always return true. Beginning expression is always true. End of each iteration, PHP evaluates control structure. Main difference from while do, first expression must be return true.

Let's see it in an example:

<?php
$i = 0;
echo 'This code will run at least once because i default value is 0.<br/>';
do {
echo 'i value is ' . $i . ', so code block will run. <br/>';
++$i;
} while ($i < 10);
?>

Happy Coding

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