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9.7 Using PHP
9 FAQ : Foire Aux Questions
 Manuel PHP
-> 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?
.  I need to convert all single-quotes (') to a backslash followed by a single-quote. How can I do this with a regular expression?
.  When I do the following, the output is printed in the wrong order:
.  Hey, what happened to my newlines?
.  I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.
.  I need to access information in the request header directly. How can I do this?
.  When I try to use authentication with IIS I get 'No Input file specified'.
.  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.
.  How am I supposed to mix XML and PHP? It complains about my <?xml> tags!
.  How can I use PHP with FrontPage or some other HTML editor that insists on moving my code around?
.  Where can I find a complete list of pre-set variables available to me, and why are these not documented in the PHP documentation?
.  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?

9.7.1 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?

Make sure that the track_vars feature is enabled in your php.ini file. Since PHP 4.0.3, this feature is always on. When track_vars is on, it creates some associative arrays, the most important here is: $_POST (this used to be called $HTTP_POST_VARS in PHP versions prior 4.1.0). So, to write a generic script to handle POST method variables you would need something similar to the following: 


foreach ($_POST as $var => $value) {
    echo "$var = $value<br>\n";
}

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FAQ : Foire Aux Questions Using PHP I need to convert all single-quotes (') to a backslash followed by a single-quote. How can I do this with a regular expression?