<?php

for ($i = 0; $i < 10; $i++) {
    echo "Requiring setup for run {$i}\n";
    require_once('example.php');
}


$mypid = getmypid();
echo "\n";
echo "Take a look and see what's included:\n\n";
echo "lsof -p {$mypid}\n\n";
passthru("lsof -p {$mypid}");

<?php

require('example.php');
print_r(get_included_files());

Array
(
    [0] => /private/tmp/argh/test2.php
    [1] => /private/tmp/argh/example.php
)

php test2.php
Array
(
    [0] => /private/tmp/argh/test2.php
    [1] => /private/tmp/argh/example.php
)

phpdbg -rr test2.php
[Welcome to phpdbg, the interactive PHP debugger, v0.5.0]
To get help using phpdbg type "help" and press enter
[Please report bugs to <http://bugs.php.net/report.php>]
Array
(
    [0] => /private/tmp/argh/example.php
)