After more then one hour of search on that follow command:
i don't understand why use the symbol { and } over the first parameter.
You're looking for something too specific.
{ } work when substituting any shell variable in any context shell variables can be substituted in. It's normal syntax, and the safe way to do substitution, because it's less ambiguous. Would $var1_$var2 substitute $var1 or $var1_ ? The latter, to prevent that you'd do ${var1}_${var2}.
Hi....can you guys help me out in this script??
Below is a text file script....called Bukom.txt and it contains these:
BUKOM 20060101 2.5 2.6 2.7 2.8 2.9 2.3 2.1
BUKOM 20060102 2.4 2.5 2.6 2.7 2.7 2.6 2.4
BUKOM 20060103 2.1 2.3 2.5 2.6 2.7 2.7 2.6
Can you guys help... (2 Replies)
hello hackers again. please help me out once again.
i have a script which executes CURL to fetch a file from the web and instantly outputs the files content to STDOUT.
now my question -
can i somehow write the progress-status to a file?
so that curl acts silently (-s) and only puts... (0 Replies)
Hi all,
I am a newbie to servlet programming using webrick...
Was wondering how to accept data from a form and do necessary
processing..
To start with i wrote a sample servlet that accepts a name and prints
"welcome <name>"
But I do not know how to take this value from the form into the... (0 Replies)
Dear All
I am trying to write one shell which will be running through Cron which contain one SQL query. But I want to draw/fetch the Username password and Instance name (required to loging to the database) from one single file to run that SQL query . Also this file contain details of multiple... (2 Replies)
I have one configuration file. The number of lines in the file will vary. I need to pass each line as a parameter to a shell script in a single shot.
Ex:
Suppose file contains:
ou=x,o=z
o=y
Suppose the shell script name is sample.sh. Then the script should be called like sample.sh ou=x.o=z... (6 Replies)
Hello to all,
I would like to search sequences of bytes inside big binary file.
The bin file contains blocks of information, each block begins is estructured as follow:
1- Each block begins with the hex 32 (1 byte) and ends with FF. After the FF of the last block, it follows 33.
2- Next... (59 Replies)
Hi, I have 2 different values in the same column and two different values in other column
Query 1
ins name value
1 Test 12345
1 TestV1 12/10/2014
8 Test 85435
8 TestV1 11/11/2005
9 Test 42232
9 TestV1 19/10/2000
6 Test 54321... (6 Replies)
Given this file (I separated them in block to make my explanation clearer):
92157768877;Sof_deme_Fort_Email_am_%yyyy%%mm%%dd%;EMAIL;20/02/2015;1;0;0
92157768877;Sof_trav_Fort_Email_am_%yyyy%%mm%%dd%;EMAIL;20/02/2015;1;0;0
91231838895;Sof_deme_faible_Email_am;EMAIL;26/01/2015;1 0;0... (1 Reply)
Hello gurus,
I have a csv file with bunch of datas in each column. (see attached)
Now I have an .xml file in the structure of below:
?xml version="1.0" ?>
<component id="root" name="root">
<component id="system" name="system">
<param name="number_of_A" value="8"/>
... (5 Replies)
Dear forum members,
My question is simple. I want to pass a single quote (') to be read as belonging as an addition to the letters C1', C2', C3', C4', C5', O1', O2', O3', O4' & O5' to the program voronota query-contacts which would be run through shell script and should print out numerical... (7 Replies)
Discussion started by: Aurimas
7 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 outputSYNOPSIS
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)