01-25-2013
Webcasting
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Hi
I'd like to know if to reboot a work station I need the root permission.
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Cheers
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Hello all,
A quick question on Sparc Station 5.
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hi,
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hi
I wanna make radio broadcasting from my web page. I am planning to use a linux server. I have no idea about how can I do :( I heard about RealPlayer can be used but ,unfortunatelly, I don't know how!
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I am trying to write a client server chat program in C and am unsure as to how I would broadcast all the users IDs over the network. At the moment I have the usernames stored in a array clientsock.cl_id, I am able to output this information to the server but am unsure how to transmit this... (1 Reply)
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Hey guys...hopefully this will be a fairly easy one.
I've got an old SPARCstation 5 running Sun 5.5.1 that I just hooked up to the network so that I can run HP OpenView. The box is working fine, but it is broadcasting as a boot server. In other words, when co-workers come in and get ready to log... (2 Replies)
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Hey guys...hopefully this will be a fairly easy one.
I've got an old SPARCstation 5 running Sun 5.5.1 that I just hooked up to the network so that I can run HP OpenView. The box is working fine, but it is broadcasting as a boot server. In other words, when co-workers come in and get ready to... (2 Replies)
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8. Shell Programming and Scripting
for secure access purposes I want to know where somebody logs in
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I have
who am i= giving user and terminal =gxb pts/4 Jan 22 15:0
finger user => gives all sessions of user
=
Login name: gxb
Directory: /home/gxb ... (17 Replies)
Discussion started by: ghislain
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UNSET(3) 1 UNSET(3)
unset - Unset a given variable
SYNOPSIS
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)