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downgrading script to work with pre-4.3 php

Posted on 2004-08-08
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Last Modified: 2012-06-27

I deliver content to other sites by having them put this script on their php enabled site:

<?
//code for the Currency Exchange Calculator
$rqst=$HTTP_SERVER_VARS["HTTP_HOST"].$HTTP_SERVER_VARS["PHP_SELF"];
$url="http://www.onyoursite.com/data/cxc.htp?rqst=".$rqst;
$content = @file_get_contents($url);
print $content;
?>

It gets the url the script is on ($rqst), sets up the url, sends the requesting url to me and grabs the content, and prints it.

Some of my users are using pre 4.3 versions of php.  I need this script redesigned for earlier versions of php.  For example, I know that file_get_contents wasn't part of php before 4.3.  I don't know about the server vars.

I don't want it to be an 'include', as, if I understand things correctly, that would allow me to run a script on their site, a security breach for the user.  It should be something that gets the text and prints it onto their page.

A short, efficient code is preferred over long winded scripts.

Thank you,    Chris
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Question by:St_Aug_Beach_Bum
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11 Comments
 
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Accepted Solution

by:
Jaime Olivares earned 400 total points
Comment Utility
About file_get_contents() have you tried with readfile() ? It read entire file and send directly to standard output.
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Expert Comment

by:Jaime Olivares
Comment Utility
About $HTTP_SERVER_VARS, them are compatible with versions previous to PHP 4.1
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by:waygood
Comment Utility
if (!function_exists('file_get_contents'))
{
    function file_get_contents($filename, $use_include_path = 0)
    {
        $file = @fopen($filename, 'rb', $use_include_path);
        if ($file)
        {
            if ($fsize = @filesize($filename))
            {
                $data = fread($file, $fsize);
            }
            else
            {
                while (!feof($file))
                {
                    $data .= fread($file, 1024);
                }
            }
            fclose($file);
        }
        return $data;
    }
}
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Author Comment

by:St_Aug_Beach_Bum
Comment Utility

Replacing file_get_contents with readfile worked except I also get a number below the content, the number of bytes read I guess.  How can I suppress that?

Waygood, I will know ahead of time that the user doesn't have 4.3 or more, so I don't need the if statement.  Can you boil this down to just the pre - 4.3 part and I will test it as well :)

Chris
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Assisted Solution

by:waygood
waygood earned 100 total points
Comment Utility
Also because the $HTTP vars are going to be dropped at some point in favour of the $_SERVER stuff then use:-

if(isset($_SERVER))
{
      $rqst=$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"];
}
else
{
      $rqst=$HTTP_SERVER_VARS["HTTP_HOST"].$HTTP_SERVER_VARS["PHP_SELF"];
}
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Expert Comment

by:waygood
Comment Utility
but using both bits you can give the script to everyone, no need to check if they are pre 4.3
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by:Jaime Olivares
Comment Utility
>Replacing file_get_contents with readfile worked except I also get a number below the content, the number of bytes read I
> guess.  How can I suppress that?
I guess you are trying to do something like this:

print (readfile($url));

readfile returns bytes read and your are printing them. Just use:

readfile($url), no need to call print() or echo()
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Author Comment

by:St_Aug_Beach_Bum
Comment Utility

ah, ok Jaime, that works :)

Waygood, I understand, but I want to keep this code as short and simple looking as possible.  But I really do appreciate your help.  In fact, I am going to use part of your answer as well.  The part about using $_SERVER.  I'm glad you pointed that out.

Thank you both,    Chris
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Author Comment

by:St_Aug_Beach_Bum
Comment Utility

In fact, are readfile and file_get_contents compariable efficiency wise, maybe I should be using readfile for more current versions of php as well?
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Expert Comment

by:Jaime Olivares
Comment Utility
I think readfile could be more efficient because it don't store entire file content in a variable.
file_get_contents could be useful when you have to parse file contents.
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Author Comment

by:St_Aug_Beach_Bum
Comment Utility

Thank you Jaime,

Chris
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