02-10-2009
9 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
HI.
I just accidently wipe out my hard drive when i installed sun solaris, this is the last thing i remember, it ask me if want to delete the partition table, and i said yes" Im a retard" i thought solaris can't see xp partition table. Could anyone help me recover my data back, is it really... (21 Replies)
Discussion started by: souldier
21 Replies
2. UNIX for Dummies Questions & Answers
actually i have important question about unix / linux
i'm working on visuall basic and visuall c++
i heared from someone that i can't open them while i useing unix / linux
is that right?
if yes .......... what's the solution
if no ............. thanks :) :D :D
thanks my friends (1 Reply)
Discussion started by: M_Hafez
1 Replies
3. AIX
Hi guys,
I would like to inform you that I have cleared ....
IBM Certified Specialist - p5 and pSeries Administration and Support for AIX 5L V5.3 with 89%
thanks to you all.
Manu (0 Replies)
Discussion started by: b_manu78
0 Replies
4. Shell Programming and Scripting
Hello Guys,
I have written the following script to do certain job. I have more than 300 files, all are .pdb & .out files. and the files are (1,3,5,7,11,13,15,17,21,.......787,791,793,795).pdb /.out . But the way I created the for loop in my script works only one file at a time. But that is not... (2 Replies)
Discussion started by: chuchu
2 Replies
5. UNIX for Advanced & Expert Users
I want a Bash Shell Script for taking backup of all files created to day and killing all the Process still active of mine at evening every day (1 Reply)
Discussion started by: vinayraj
1 Replies
6. UNIX for Advanced & Expert Users
Dear All
I have a pattern which look like this :
2 20080226_18:02:09.749 ISC-Libya Egypt-Cairo2 111 IAM 2913258040 218927157966 b 61 REL f 143 RLC :COMMA:NCI=10,FCI=6101,CPC=0A,TMR=00,OFI=80,USI: :COMMB:: :RELCAUSE:15:
2 20080226_18:02:11.629 ISC-Libya Egypt-Cairo2 170 IAM 93572641... (8 Replies)
Discussion started by: zanetti321
8 Replies
7. UNIX for Advanced & Expert Users
Dear All
I have an important request:
I have a pattern which look like this:
2 20080219_21:43:22.194 ISC-Libya Belgium1 24 IAM 20115139248 218913265641 b 11672 ACM b 20614 CPG b 20619 CPG b 20626 CPG f 33925 REL b 34215 RLC :COMMA: NCI=00,FCI=6001,CPC=0A,TMR=00,USI: :COMMB: BCI=0201:... (15 Replies)
Discussion started by: zanetti321
15 Replies
8. Cybersecurity
Hey guys, new geek here, sorry I didnt see a intro section. But I do have a question and hope to make my stay here perma. I am interested in IT security, ands I really want to learn, I was hoping for whatever questions I had you guys could lead me through the narrowest path with a broad selection... (1 Reply)
Discussion started by: abeja
1 Replies
9. Shell Programming and Scripting
how to print first line of each repeated 2 fields only if i got files like :
USA|Tony|12:25:22:431
USA|John|14:22:42:981
USA|John|08:22:12:349
France|Adam|14:22:42:981
Italy|Tony|18:22:42:212
Italy|Tony|04:22:42:212
Italy|Tony|08:22:42:212
to make output like :
... (9 Replies)
Discussion started by: teefa
9 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)