newline on source code?

I'm making a simple global get configuration.

try to make a index.php

function config( $string ){
    require 'configuration开发者_运维问答.php';
    return $config[$string];
}

echo config('hello');
echo config('hello');

and a configuration.php

$config['hello'] = TRUE;

and yes as we can see it outputs 1.

but when we see the source, it will give us something like

sorry for the stupid question, but I just cant stop asking.

Thanks for looking in.

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Are there any newlines before your <?PHP - Tag or after the ?> in your 'configuration.php' ? If so, remove them, because PHP outputs everything it sees directly to the browser, if it's not enclosed by PHP Tags.

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You're requiring configuration.php inside the config function. Any blank lines in configuration.php before the <?php or after the ?> are being output to the page.

Consider moving the require line outside the config function.

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See this answer: Mysterious line break is being appended to ajax loaded content

You probably have line breaks from a different OS, and your editor isn't capable of displaying them. Some editors can, some ignore them. So for instance, if I were to have edited the file on a Mac and left a blank line, then you open it in Windows, your text editor might not show you the blank line, and you might even have a hard time deleting it.

Try to copy/paste the code into something like Windows Notpad, then copy/paste it back out. Notepad ignores everything it doesn't recognize.