Podręcznik PHP
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# Rozdział 50. Using PHP

This section gathers many common errors that you may face while writing PHP scripts.

1. I would like to write a generic PHP script that can handle data coming from any form. How do I know which POST method variables are available?
2. I need to convert all single-quotes (') to a backslash followed by a single-quote (\'). How can I do this with a regular expression? I'd also like to convert " to \" and \ to \\.
3. All my " turn into \" and my ' turn into \', how do I get rid of all these unwanted backslashes? How and why did they get there?
4. When I do the following, the output is printed in the wrong order:

`<?php function myfunc($argument) { echo $argument + 10; } $variable = 10; echo "myfunc($variable) = " . myfunc($variable); ?>`

what's going on?
5. Hey, what happened to my newlines?

`<pre> <?php echo "This should be the first line."; ?> <?php echo "This should show up after the new line above."; ?> </pre>`

6. I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.
7. I need to access information in the request header directly. How can I do this?
8. When I try to use authentication with IIS I get 'No Input file specified'.
9. My PHP script works on IE and Lynx, but on Netscape some of my output is missing. When I do a "View Source" I see the content in IE but not in Netscape.
10. How am I supposed to mix XML and PHP? It complains about my <?xml tags!
11. How can I use PHP with FrontPage or some other HTML editor that insists on moving my code around?
12. Where can I find a complete list of variables are available to me in PHP?
13. How can I generate PDF files without using the non-free and commercial libraries ClibPDF and PDFLib? I'd like something that's free and doesn't require external PDF libraries.
14. I'm trying to access one of the standard CGI variables (such as $DOCUMENT_ROOT or $HTTP_REFERER) in a user-defined function, and it can't seem to find it. What's wrong?

1. I would like to write a generic PHP script that can handle data coming from any form. How do I know which POST method variables are available?

PHP offers many predefined variables, like the superglobal `$_POST`. You may loop through `$_POST` as it's an associate array of all POSTed values. For example, let's simply loop through it with foreach, check for empty() values, and print them out.

`<?php $empty = $post = array(); foreach ($_POST as $varname => $varvalue) { if (empty($varvalue)) { $empty[$varname] = $varvalue; } else { $post[$varname] = $varvalue; } } print "<pre>"; if (empty($empty)) { print "None of the POSTed values are empty, posted:\n"; var_dump($post); } else { print "We have " . count($empty) . " empty values\n"; print "Posted:\n"; var_dump($post); print "Empty:\n"; var_dump($empty); exit; } ?>`

> Tablice superglobalne: uwaga na temat dostępności: Od PHP w wersji 4.1.0, udostępnione zostały tablice superglobalne takie jak `$_GET`, `$_POST` czy `$_SERVER`. Więcej informacji można znaleźć w rozdziale superglobals

2. I need to convert all single-quotes (') to a backslash followed by a single-quote (\'). How can I do this with a regular expression? I'd also like to convert " to \" and \ to \\.

The function addslashes() will do this. See also mysql_escape_string(). You may also strip backslashes with stripslashes().

> uwaga na temat dyrektywy: magic_quotes_gpc: Domyślną wartością dyrektywy konfiguracji PHP magic_quotes_gpc jest `on`. Powoduje ona wykonywanie funkcji addslashes() na wszystkich danych GET, POST i COOKIE. Można użyć funkcji stripslashes() aby usunąć dodane znaki slash.

3. All my " turn into \" and my ' turn into \', how do I get rid of all these unwanted backslashes? How and why did they get there?

The PHP function stripslashes() will strip those backslashes from your string. Most likely the backslashes magically exist because the PHP directive magic_quotes_gpc is on.

> uwaga na temat dyrektywy: magic_quotes_gpc: Domyślną wartością dyrektywy konfiguracji PHP magic_quotes_gpc jest `on`. Powoduje ona wykonywanie funkcji addslashes() na wszystkich danych GET, POST i COOKIE. Można użyć funkcji stripslashes() aby usunąć dodane znaki slash.

4. When I do the following, the output is printed in the wrong order:

`<?php function myfunc($argument) { echo $argument + 10; } $variable = 10; echo "myfunc($variable) = " . myfunc($variable); ?>`

what's going on?

To be able to use the results of your function in an expression (such as concatenating it with other strings in the example above), you need to return() the value, not echo() it.

5. Hey, what happened to my newlines?

`<pre> <?php echo "This should be the first line."; ?> <?php echo "This should show up after the new line above."; ?> </pre>`

In PHP, the ending for a block of code is either "?>" or "?>\n" (where \n means a newline). So in the example above, the echoed sentences will be on one line, because PHP omits the newlines after the block ending. This means that you need to insert an extra newline after each block of PHP code to make it print out one newline.

Why does PHP do this? Because when formatting normal HTML, this usually makes your life easier because you don't want that newline, but you'd have to create extremely long lines or otherwise make the raw page source unreadable to achieve that effect.

6. I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.

The functions header(), setcookie(), and the session functions need to add headers to the output stream but headers can only be sent before all other content. There can be no output before using these functions, output such as HTML. The function headers_sent() will check if your script has already sent headers and see also the Output Control functions.

7. I need to access information in the request header directly. How can I do this?

The getallheaders() function will do this if you are running PHP as an Apache module. So, the following bit of code will show you all the request headers:

`<?php $headers = getallheaders(); foreach ($headers as $name => $content) { echo "headers[$name] = $content<br />\n"; } ?>`

See also apache_lookup_uri(), apache_response_headers(), and fsockopen()

8. When I try to use authentication with IIS I get 'No Input file specified'.

The security model of IIS is at fault here. This is a problem common to all CGI programs running under IIS. A workaround is to create a plain HTML file (not parsed by PHP) as the entry page into an authenticated directory. Then use a META tag to redirect to the PHP page, or have a link to the PHP page. PHP will then recognize the authentication correctly. With the ISAPI module, this is not a problem. This should not effect other NT web servers. For more information, see: http://support.microsoft.com/support/kb/articles/q160/4/22.asp and the manual section on HTTP Authentication .

9. My PHP script works on IE and Lynx, but on Netscape some of my output is missing. When I do a "View Source" I see the content in IE but not in Netscape.

Netscape is more strict regarding HTML tags (such as tables) then IE. Running your HTML output through a HTML validator, such as validator.w3.org, might be helpful. For example, a missing </table> might cause this.

Also, both IE and Lynx ignore any NULs (`\0`) in the HTML stream, Netscape does not. The best way to check for this is to compile the command line version of PHP (also known as the CGI version) and run your script from the command line. In *nix, pipe it through `od -c` and look for any `\0` characters. If you are on Windows you need to find an editor or some other program that lets you look at binary files. When Netscape sees a NUL in a file it will typically not output anything else on that line whereas both IE and Lynx will.

10. How am I supposed to mix XML and PHP? It complains about my <?xml tags!

In order to embed <?xml straight into your PHP code, you'll have to turn off short tags by having the PHP directive short_open_tags set to `0`. You cannot set this directive with ini_set(). Regardless of short_open_tags being on or off, you can do something like: `<?php echo '<?xml'; ?>`. The default for this directive is on.

11. How can I use PHP with FrontPage or some other HTML editor that insists on moving my code around?

One of the easiest things to do is to enable using ASP tags in your PHP code. This allows you to use the ASP-style <% and %> code delimiters. Some of the popular HTML editors handle those more intelligently (for now). To enable the ASP-style tags, you need to set the asp_tags `php.ini` variable, or use the appropriate Apache directive.

12. Where can I find a complete list of variables are available to me in PHP?

Read the manual page on predefined variables as it includes a partial list of predefined variables available to your script. A complete list of available variables (and much more information) can be seen by calling the phpinfo() function. Be sure to read the manual section on variables from outside of PHP as it describes common scenarios for external variables, like from a HTML form, a Cookie, and the URL.

> register_globals: ważna uwaga: Od PHP w wersji 4.2.0 domyślną wartością dyrektywy register_globals jest off. Społeczność PHP zaleca, aby nie polegać na tej dyrektywie, ale zamiast tego używać innych środków, takich jak superglobals.

13. How can I generate PDF files without using the non-free and commercial libraries ClibPDF and PDFLib? I'd like something that's free and doesn't require external PDF libraries.

There are a few alternatives written in PHP such as http://www.ros.co.nz/pdf/, http://www.fpdf.org/, http://www.gnuvox.com/pdf4php/, and http://www.potentialtech.com/ppl.php. There is also the Panda module.

14. I'm trying to access one of the standard CGI variables (such as $DOCUMENT_ROOT or $HTTP_REFERER) in a user-defined function, and it can't seem to find it. What's wrong?

It's important to realize that the PHP directive register_globals also affects server and environment variables. When register_globals = off (the default is off since PHP 4.2.0), `$DOCUMENT_ROOT` will not exist. Instead, use `$_SERVER['DOCUMENT_ROOT']` . If register_globals = on then the variables `$DOCUMENT_ROOT` and `$GLOBALS['DOCUMENT_ROOT']` will also exist.

If you're sure register_globals = on and wonder why `$DOCUMENT_ROOT` isn't available inside functions, it's because these are like any other variables and would require `global $DOCUMENT_ROOT` inside the function. See also the manual page on variable scope. It's preferred to code with register_globals = off.

> Tablice superglobalne: uwaga na temat dostępności: Od PHP w wersji 4.1.0, udostępnione zostały tablice superglobalne takie jak `$_GET`, `$_POST` czy `$_SERVER`. Więcej informacji można znaleźć w rozdziale superglobals

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