7 More Discussions You Might Find Interesting
1. What is on Your Mind?
This is an excellent video comment on modern society and the remix is good too:
https://www.youtube.com/watch?v=5DU1B_XkyIk
5DU1B_XkyIk
Watch the video above and post your comments. (3 Replies)
Discussion started by: Neo
3 Replies
2. Programming
Hello!
I have a question to native English-speaking people. In the popular program's "hello world" greeting, what meaning the "world" has: "all", "everybody", "people", "friends" or "whole world", "planet", "Earth", "Universe"?
In other words, to whom this greeting is addressed: to the... (14 Replies)
Discussion started by: Eugene Muzychen
14 Replies
3. Programming
Hello! I know I must take the efforts of learning C..! I need to recompile a binary with the following at the beginning: test if a file exists, remove it and exit. All in "C". As simple as this in sh:
file=/tmp/filename
if ; then
rm -f $file
exit 0
fi
Thanks! (8 Replies)
Discussion started by: teresaejunior
8 Replies
4. What is on Your Mind?
What does the world need now.... ???
Feel free to suggest new items to the poll .... we might add them :) (25 Replies)
Discussion started by: Neo
25 Replies
5. Solaris
just wanted to give salutations to all in here.
i hope to contribute as much as i take.
happy "unix-ing" :b: (0 Replies)
Discussion started by: JeepResQ
0 Replies
6. Post Here to Contact Site Administrators and Moderators
I just want to say how much I love the unix forum. You all are awesome!
I find the UNIX forum very educational, very prompt in responding and a really great website. I want to thank each an everyone of you for doing a fantastic job.
Great Customer Service in educating and assisting us with our... (2 Replies)
Discussion started by: kflanigan
2 Replies
7. Solaris
I am having trouble getting the aide/configure to see the static link libmash.
I verifyed that I had a static of mhash installed.
#./configure --enable-static=yes
did
#make install
#make check
Everything looks good.
Ran Aide 0.10 configure by:
#./configure
And I get the... (0 Replies)
Discussion started by: siamhien
0 Replies
LEARN ABOUT PHP
debug_zval_dump
DEBUG_ZVAL_DUMP(3) 1 DEBUG_ZVAL_DUMP(3)
debug_zval_dump - Dumps a string representation of an internal zend value to output
SYNOPSIS
void debug_zval_dump (mixed $variable, [mixed $...])
DESCRIPTION
Dumps a string representation of an internal zend value to output.
PARAMETERS
o $variable
- The variable being evaluated.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
debug_zval_dump(3) example
<?php
$var1 = 'Hello World';
$var2 = '';
$var2 =& $var1;
debug_zval_dump(&$var1);
?>
The above example will output:
&string(11) "Hello World" refcount(3)
Note
Beware the refcount
The refcount value returned by this function is non-obvious in certain circumstances. For example, a developer might expect the
above example to indicate a refcount of 2. The third reference is created when actually calling debug_zval_dump(3).
This behavior is further compounded when a variable is not passed to debug_zval_dump(3) by reference. To illustrate, consider a
slightly modified version of the above example:
Example #2
<?php
$var1 = 'Hello World';
$var2 = '';
$var2 =& $var1;
debug_zval_dump($var1); // not passed by reference, this time
?>
The above example will output:
string(11) "Hello World" refcount(1)
Why refcount(1)? Because a copy of $var1 is being made, when the function is called.
This function becomes even more confusing when a variable with a refcount of 1 is passed (by copy/value):
Example #3
<?php
$var1 = 'Hello World';
debug_zval_dump($var1);
?>
The above example will output:
string(11) "Hello World" refcount(2)
A refcount of 2, here, is extremely non-obvious. Especially considering the above examples. So what's happening?
When a variable has a single reference (as did $var1 before it was used as an argument to debug_zval_dump(3)), PHP's engine opti-
mizes the manner in which it is passed to a function. Internally, PHP treats $var1 like a reference (in that the refcount is
increased for the scope of this function), with the caveat that if the passed reference happens to be written to, a copy is made,
but only at the moment of writing. This is known as "copy on write."
So, if debug_zval_dump(3) happened to write to its sole parameter (and it doesn't), then a copy would be made. Until then, the
parameter remains a reference, causing the refcount to be incremented to 2 for the scope of the function call.
SEE ALSO
var_dump(3), debug_backtrace(3), References Explained, References Explained (by Derick Rethans).
PHP Documentation Group DEBUG_ZVAL_DUMP(3)