SUPERGLOBALS(3) 1 SUPERGLOBALS(3)Superglobals - Superglobals are built-in variables that are always available in all scopes
Several predefined variables in PHP are "superglobals", which means they are available in all scopes throughout a script. There is no need
to do global $variable; to access them within functions or methods.
These superglobal variables are:
o$GLOBALS
o$_SERVER
o$_GET
o$_POST
o$_FILES
o$_COOKIE
o$_SESSION
o$_REQUEST
o$_ENV
+--------+---------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------+
| 4.1.0 | |
| | |
| | Superglobals were introduced to PHP. |
| | |
+--------+---------------------------------------+
Note
Variable availability
By default, all of the superglobals are available but there are directives that affect this availability. For further information,
refer to the documentation for variables_order.
Note
Dealing with register_globals
If the deprecated register_globals directive is set to on then the variables within will also be made available in the global scope
of the script. For example, $_POST['foo'] would also exist as $foo.
For related information, see the FAQ titled "How does register_globals affect me?"
Note
Variable variables
Superglobals cannot be used as variable variables inside functions or class methods.
variable scope, The variables_order directive, The filter extension.
PHP Documentation Group SUPERGLOBALS(3)
Check Out this Related Man Page
_ENV(3) 1 _ENV(3)
$_ENV - Environment variables
An associative array of variables passed to the current script via the environment method.
These variables are imported into PHP's global namespace from the environment under which the PHP parser is running. Many are provided by
the shell under which PHP is running and different systems are likely running different kinds of shells, a definitive list is impossible.
Please see your shell's documentation for a list of defined environment variables.
Other environment variables include the CGI variables, placed there regardless of whether PHP is running as a server module or CGI proces-
sor.
$HTTP_ENV_VARS contains the same initial information, but is not a superglobal. (Note that $HTTP_ENV_VARS and $_ENV are different variables
and that PHP handles them as such)
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 4.1.0 | |
| | |
| | Introduced $_ENV that deprecated $HTTP_ENV_VARS. |
| | |
+--------+---------------------------------------------------+
Example #1
$_ENV example
<?php
echo 'My username is ' .$_ENV["USER"] . '!';
?>
Assuming "bjori" executes this script
The above example will output something similar to:
My username is bjori!
Note
This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script.
There is no need to do global $variable; to access it within functions or methods.
getenv(3), The filter extension.
PHP Documentation Group _ENV(3)
are they any server variables in bash/SSH scripting as is in PHP or Perl, for example in PHP:
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OS HPUX 11.11
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