PHP ob_get_clean removing newlines after ?>

I am trying to create a function that grabs a script file and executes the output on a telnet device. I have it working, but ob_get_clean seems to be removing any newlines after a 开发者_JAVA技巧php closing brace (?>). Has anyone encountered this problem?

public final function execScript($name, $args)
{
    ob_start();
    include("../apps/frontend/modules/device/scripts/" . $name . ".php");
    $partial = ob_get_clean();
    $commands = explode("\n", $partial);

    foreach($commands as $command)
    {
        $output .= $this->telnet->exec($command);
    }

    return $output;
}

"Script"

conf
int ethernet 1/<?php echo $args['port']; ?>
switchport allowed vlan add <?php echo $args['vlan_id']; ?> tagged
switchport native vlan <?php echo $args['vlan_id']; ?>
switchport allowed vlan remove 1
end

Expected Output

conf
int ethernet 1/18
switchport allowed vlan add 100 tagged
switchport native vlan 100
switchport allowed vlan remove 1
end

Actual Output

conf
int ethernet 1/18switchport allowed vlan add 100 tagged
switchport native vlan 100switchport allowed vlan remove 1
end

One newline will always be ignored after a closing ?> tag -- using output buffering doesn't change anything.

As a reference, see Instruction separation :

The closing tag for the block will include the immediately trailing newline if one is present.

And Escaping from HTML :

when PHP hits the ?> closing tags, it simply starts outputting whatever it finds (except for an immediately following newline - see instruction separation )

According to those two sentences from the PHP manual (and from my own experience), losing a newline after the ?>, like you do, is documented and expected behavior¹.

^1._{Even if surprising, the first time you encounter it ^^}

Yes, PHP does that - it removes one single newline after the ?>

It does that because in a normal PHP file, you close it with ?> then you have a trailing newline which would often mess things up.

In your case, it's not helping.

I would do this:

conf
int ethernet 1/<?php echo $args['port'] . "\n";
?>switchport

I moved the closing ?> to the next line just so you are not depending on newline removal.