Welcome to the Cookbook

One tab will be used for indentation.

So, indentation should look like this:

<?php
// base level
    // level 1
        // level 2
    // level 1
// base level
?>

1. <?php
2. // base level
3. // level 1
4. // level 2
5. // level 1
6. // base level
7. ?>

Or:

$booleanVariable = true;
$stringVariable = "moose";
if ($booleanVariable) {
    echo "Boolean value is true";
    if ($stringVariable == "moose") {
        echo "We have encountered a moose";
    }
}

1. $booleanVariable = true;
2. $stringVariable = "moose";
3. if ($booleanVariable) {
4. echo "Boolean value is true";
5. if ($stringVariable == "moose") {
6. echo "We have encountered a moose";
7. }
8. }