<?php 

$customergroup = 0;

while ($customergroup++ < 10) {
    echo "\n$customergroup. check: ";

    if ($customergroup == 1) {
        ?>First content if variable is/equals 1<?php 
    } else if ($customergroup == 2) {
        ?>Second content if variable is/equals 2<?php
    } else if ($customergroup == 3) {
        ?>Third content if variable is/equals 3<?php
    } else if ($customergroup == 4) {
        ?>Fourth content if variable is/equals 4<?php
    } else {
        ?>No number equals.<?php
    }
}

?>

1. check: First content if variable is/equals 1
2. check: Second content if variable is/equals 2
3. check: Third content if variable is/equals 3
4. check: Fourth content if variable is/equals 4
5. check: No number equals.
6. check: No number equals.
7. check: No number equals.
8. check: No number equals.
9. check: No number equals.
10. check: No number equals.