And tidier still to avoid the rat's nest of test backticks echo.
This assumes some things about how $dow and $cld and $hot are set up; you might need to tweak this if they are not simply one-to-one, but you get the idea. This is IMHO much more readable, as well as more efficient.
If $dow is the numeric day of the week and the values of $cld and $hot are something like 7 (signifying Sunday) and 135 (Mon Wed Fri), then perhaps
Hello all,
I have a situation where I have a web root directory with a few thousand users spread out into 100 subdirectories in a 00/firstname.lastname, 01/firstname.lastname, etc. hierarchy. I suddenly need to make sure that each of these user directories contains a default index.html file... (6 Replies)
I need a way to grep -v a list of times/date from the output of postqueue -p that are a few hours old, in order to remove them with postsuper -d.
Right now I have a script that is deleting the previous day of messages left in the queue, which runs once each day.
I want to clean up the job and... (1 Reply)
Hallo,
I need to test a String (a special ip number-string).
So I want to run that:
ipadress=172.0.0.0
# for debugging:
echo $ipadress | egrep -e '172\.?\.??\.??$'
# the test that doesnt work
if test -z `echo $ipadress | egrep -e '172\.?\.??\.??$'` != ""
then
echo "match"
else... (1 Reply)
I'm very very new to shell scripting (about 4 hours)
i've google'd till i can't google no more
is it possible to have store values in a config file .e.g
/etc/foo.conf
data=/home/
mount=/dev/sda1
size=1GB
and access these values from a shell script but also
be able to use... (3 Replies)
Suppose I have a text file that contains the tags <foo> and <bar>. The text file can have unlimted occurances of <foo> and <bar> and looks somthing like this:
<foo>
Some
Text
<foo>
Some
Text
<bar>
Some
Text
<foo>
Some (1 Reply)
I'm not all that much of a newbie but I've not encountered this before. Happens both in Cygwin and in Mac OS X (Darwin):
cp -R /path/to/foo/.* /path/to/bar
(where directory 'bar' exists)
... seems to copy not only the contents of directory 'foo', but also other directories that are... (3 Replies)
Sometimes it works for me and sometimes I get this error:
syntax error on line 1, teletype
Basically I've got no idea whats going on, especially at the end of the command: bc
Any help is appreciated (1 Reply)
I am writing a BASH script to update a webserver and then restart Apache. It looks basically like this:
#!/bin/bash
rsync /path/on/local/machine/ foo.com:path/on/remote/machine/
ssh foo.com sudo /etc/init.d/apache2 reloadrsync and ssh don't prompt for a password, because I have DSA encryption... (9 Replies)
Discussion started by: fluoborate
9 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)