Note:
1. The first two strings seperated by whitespace combines to be the first element of the array.
2. Not all white spaces between the strings are the same.
Below code code does not split all the elements of the string as desired.
I'd like to create a variable with the value of X number of space( no Perl please), printf seems to work, but , in following example,10 spaces becomes 1 space when assinged to a variable, Why? other solutions are welcome.
$printf "=%10s=\n"
= =
$var=$(printf "=%10s=\n")
echo... (4 Replies)
hello,
i have this string:
variable="1234 /PARAMETER_1:text /PARAMETER_2:othertext"
i tried to do
expr match $variable '.*\(*\)'
but i keep getting expr error
i need to extract the word text...
thank you (4 Replies)
I have an array and two variables as below,
I need to check if $datevar is present in $filename.
If so, i need to replace $filename with the values in the array.
I need the output inside an ARRAY
How can this be done.
Any help will be appreciated. Thanks in advance. (2 Replies)
Hi everybody!!
Here is the thing; I have a trouble in this simple situation, I'm trying to write an array with all the arguments of a command. I mean, if I have:
./mycommand.sh aa bb cc dd
I need to take an array like this:
myarray=(aa bb cc dd)
So I use a simple for loop like this:
for... (4 Replies)
Hi guys and gals...
MacBook Pro.
OSX 10.13.2, default bash terminal.
I have a flat file 1920 bytes in size of whitespaces only. I need to put every single whitespace character into a bash array cell.
Below are two methods that work, but both are seriously ugly.
The first one requires that I... (7 Replies)
Hi Experts
I have an escape seperated fields in the unix file. And in the below format file I need to extract the first column. Please help its urgent.
cat -v op.dat | head
24397028^
I want to extract the file in below format ( with only first column )
24397028
2439707
thanks.
... (6 Replies)
I will start with an example of what I'm trying to do and then describe how I am approaching the issue.
File
PS028,005
Lexeme HRS # M #
PhraseType 1(1:1) 7(7)
PhraseLab 501 503
ClauseType ZYq0
PS028,005
Lexeme W # L> # BNH # M #... (17 Replies)
Discussion started by: jvoot
17 Replies
LEARN ABOUT PHP
unpack
UNPACK(3) 1 UNPACK(3)unpack - Unpack data from binary stringSYNOPSIS
array unpack (string $format, string $data)
DESCRIPTION
Unpacks from a binary string into an array according to the given $format.
The unpacked data is stored in an associative array. To accomplish this you have to name the different format codes and separate them by a
slash /. If a repeater argument is present, then each of the array keys will have a sequence number behind the given name.
PARAMETERS
o $format
- See pack(3) for an explanation of the format codes.
o $data
- The packed data.
RETURN VALUES
Returns an associative array containing unpacked elements of binary string.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.5.0 | |
| | |
| | Changes were made to bring this function into |
| | line with Perl: The "a" code now retains trail- |
| | ing NULL bytes. The "A" code now strips all |
| | trailing ASCII whitespace (spaces, tabs, new- |
| | lines, carriage returns, and NULL bytes). The |
| | "Z" code was added for NULL-padded strings, and |
| | removes trailing NULL bytes. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
unpack(3) example
<?php
$binarydata = "x04x00xa0x00";
$array = unpack("cchars/nint", $binarydata);
?>
The resulting array will contain the entries "chars" with value 4 and "int" with 160.
Example #2
unpack(3) example with a repeater
<?php
$binarydata = "x04x00xa0x00";
$array = unpack("c2chars/nint", $binarydata);
?>
The resulting array will contain the entries "chars1", "chars2" and "int".
NOTES
Caution
Note that PHP internally stores integral values as signed. If you unpack a large unsigned long and it is of the same size as PHP
internally stored values the result will be a negative number even though unsigned unpacking was specified.
Caution
Be aware that if you do not name an element, an empty string is used. If you do not name more than one element, this means that
some data is overwritten as the keys are the same such as in:
Example #3
unpack(3) example with unnamed keys
<?php
$binarydata = "x32x42x00xa0";
$array = unpack("c2/n", $binarydata);
var_dump($array);
?>
The resulting array will contain the entries "1" with value 160 and "2" with 66. The first value from the c specifier is
overwritten by the first value from the n specifier.
SEE ALSO pack(3).
PHP Documentation Group UNPACK(3)