<?php
$includes = array(
    'some text',
    '<?php print "some text"; ?>',
    '<?php print "some text";',
    'some text<?php',
    'some text<?php ',
    'some text<?php;',
    'some text<?php ?>',
    '<?php ?>some text',
);

$tempFile = tempnam('/tmp', 'test_');

print "\r\n" . "Include:" . "\r\n";
foreach ($includes as $include)
{
    file_put_contents($tempFile, $include);
    var_dump(include $tempFile);
}

unlink($tempFile);

print "\r\n" . "Eval 1:" . "\r\n";
foreach ($includes as $include)
    var_dump(eval('?>' . $include . '<?php '));

print "\r\n" . "Eval 2:" . "\r\n";
foreach ($includes as $include)
    var_dump(eval('?>' . $include));

print "\r\n" . "Eval 3:" . "\r\n";
foreach ($includes as $include)
    var_dump(eval('?>' . $include . '<?php;'));