For Loop

<?php
for ($i = 1; $i <= 5; $i++) 
{
    echo "Line $i<br>";
}
?>

Output:
Line 1
Line 2
Line 3
Line 4
Line 5

While Loop

<?php
$i = 1;
while ($i <= 3) 
{
    echo "Number: $i<br>";
    $i++;
}
?>

Output:
Number: 1
Number: 2
Number: 3