[nycphp-talk] PHP Compatibility and Portability
Tracy
tech_learner at yahoo.com
Wed May 28 09:38:09 EDT 2003
may be this can egt things started...
http://www.weberdev.com/index.php3?GoTo=get_example.php3?count=3660
Make your PHP 4.1 (or higher) script compatible with PHP 4.0 (still used by some prviders)
<?php
// PHP4 < 4.1 Compatibility
if (!function_exists('version_compare')) {
function version_compare ($a, $b, $c) {
return (TRUE);
}
}
if (version_compare(phpversion(), "4.1.0", "<")) {
$_SERVER = $HTTP_SERVER_VARS;
$_REQUEST = array_merge ($HTTP_GET_VARS, $HTTP_POST_VARS, $HTTP_COOKIE_VARS);
$_GET = $HTTP_GET_VARS;
$_POST = $HTTP_POST_VARS;
$_COOKIE = $HTTP_COOKIE_VARS;
$_FILES = $HTTP_POST_FILES;
$_SESSION = $HTTP_SESSION_VARS;
$_ENV = $HTTP_ENV_VARS;
} // End PHP4 < 4.1 Compatibility
?>
User Comments:
You aren`t REALLY ensuring compatability of an entire script, just the $_SERVER (etc) arrays.
There is still one LARGE difference however. $_SERVER, $_POST, etc are all superglobal arrays, which means you don`t have to do things like:
function foo()
{
global $_SERVER;
}
In your example, the user would still have to have a global ... statement in any user functions they declared.
Your example solves a LOT of problems, but not all :)
Tracy
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