Hello Everyone
Im planning to make a C program to check a proxy server if it is working or bot, test the proxy speed ,response time , as well as a proxy type.
i'm learning using libcurl right now to fetch http headers. do you guys have some links about how to check proxy headers?. Thank you.
... (0 Replies)
I'm trying to write a small utility for syntax checking. I've tried using Flex/Bison, but these seem too advanced for my task. A simpler tool would be appreciated. (1 Reply)
Hi,
I am involved in a project on Debian. One of my requirement is to route an IP packet in my application to a proxy server and receive the reply from the proxy server as an IP packet. My application handles data at the IP frame level. My application creates an IP packet(with all the necessary... (0 Replies)
Hi,
Not sure if this post belongs to this forum but I have been trying every so often to setup a simple http server in awk. After a couple of try and errors I finally came across this:
REMCONF - TCP/IP Internetworking With `gawk'
This tutorial is not to cut and paste without change, so here... (0 Replies)
I am having problems receiving data from a remote server. It seems that I can send an HTTP request to any host such as http://www.google.com, but I can't get a reply.
I'm sending the host a HTTP 1.0 request that is formatted as such:
GET / HTTP/1.0
Host: http://www.google.com
Connection:... (0 Replies)
I'm fairly new to bash scripts, and all things unix in general. But I was in desperate need of this script, so I took matters into my own hands and built it!
The first script uses a password generator that creates 4 letter domain names and outputs only the ones that are available. Currently its... (0 Replies)
I am having a hard time with this one. We have a websocket server listening on port 80 at myserver.com/wsDemo?ID=12. We need to test a client program by connecting it to this server through a proxy. I am trying nginx 1.2.7 as the proxy on port 8080, running on proxy-server. We want the client to... (1 Reply)
Hi,
I am trying to configure an HTTP_PROXY so that suma can reach out beyond our intranet and pull updates from the IBM website. Currently, our suma config is the default as it's not been used before. When I attempt to issue the following command sudo suma... (7 Replies)
Discussion started by: JAR1
7 Replies
LEARN ABOUT PHP
unset
UNSET(3) 1 UNSET(3)unset - Unset a given variableSYNOPSIS
void unset (mixed $var, [mixed $...])
DESCRIPTION unset(3) destroys the specified variables.
The behavior of unset(3) inside of a function can vary depending on what type of variable you are attempting to destroy.
If a globalized variable is unset(3) inside of a function, only the local variable is destroyed. The variable in the calling environment
will retain the same value as before unset(3) was called.
<?php
function destroy_foo()
{
global $foo;
unset($foo);
}
$foo = 'bar';
destroy_foo();
echo $foo;
?>
The above example will output:
bar
To unset(3) a global variable inside of a function, then use the $GLOBALS array to do so:
<?php
function foo()
{
unset($GLOBALS['bar']);
}
$bar = "something";
foo();
?>
If a variable that is PASSED BY REFERENCE is unset(3) inside of a function, only the local variable is destroyed. The variable in the
calling environment will retain the same value as before unset(3) was called.
<?php
function foo(&$bar)
{
unset($bar);
$bar = "blah";
}
$bar = 'something';
echo "$bar
";
foo($bar);
echo "$bar
";
?>
The above example will output:
something
something
If a static variable is unset(3) inside of a function, unset(3) destroys the variable only in the context of the rest of a function. Fol-
lowing calls will restore the previous value of a variable.
<?php
function foo()
{
static $bar;
$bar++;
echo "Before unset: $bar, ";
unset($bar);
$bar = 23;
echo "after unset: $bar
";
}
foo();
foo();
foo();
?>
The above example will output:
Before unset: 1, after unset: 23
Before unset: 2, after unset: 23
Before unset: 3, after unset: 23
PARAMETERS
o $var
- The variable to be unset.
o $...
- Another variable ...
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
unset(3) example
<?php
// destroy a single variable
unset($foo);
// destroy a single element of an array
unset($bar['quux']);
// destroy more than one variable
unset($foo1, $foo2, $foo3);
?>
Example #2
Using (unset) casting
(unset) casting is often confused with the unset(3) function. (unset) casting serves only as a NULL-type cast, for completeness. It
does not alter the variable it's casting.
<?php
$name = 'Felipe';
var_dump((unset) $name);
var_dump($name);
?>
The above example will output:
NULL
string(6) "Felipe"
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Note
It is possible to unset even object properties visible in current context.
Note
It is not possible to unset $this inside an object method since PHP 5.
Note
When using unset(3) on inaccessible object properties, the __unset() overloading method will be called, if declared.
SEE ALSO isset(3), empty(3), __unset(), array_splice(3).
PHP Documentation Group UNSET(3)