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while (condition)
{
    code to be executed;
}

<html>
<body>

<?php
$i=1;
while($i<=5)
{
    echo "The number is " . $i . "<br>";
    $i++;
}
?>

</body>
</html>

do
{
    code to be executed;
}
while (condition);

<html>
<body>

<?php
$i=1;
do
{
    $i++;
    echo "The number is " . $i . "<br>";
}
while ($i<=5);
?>

</body>
</html>