Here is what I did . . . . I FTP'd several *.pdf files from a web site to a UNIX server, and did not set the transfer mode to BIN, now Adobe thinks that the documents are corrupted. Is there a way to convert the *.pdf files to Binary so that Adobe can open them again. I would just re-download... (2 Replies)
Dear Experts
I need to read a binary file. I know for example in byte number 3801-3804 there is a 4 byte number embeded. Is there a way to extract this number from this file and then convert it to ascii via unix??
Your help would be highly appreciated.
Very Best Regards
Reza (5 Replies)
i hav tried to convert binary 2D data into text using binreader and writing into text file using streamwriter.
i use ReadSingle() function to convert from binary to ascii, although it works good in 1D data but not in more dimensions.
the kind of values i get are
-1.265369923E+038
and like
... (2 Replies)
Hi all,
I have a binary file (orig.dat) and two special delimiter strings 'AAA' and 'BBB'. My binary file's content is as follow:
<Data1.1>AAA<Data1.2>BBB
<Data2.1>AAA<Data2.2>BBB
...
<DataN.1>AAA<DataN.2>BBB
DataX.Y might have any length, and contains any kind of special/printable... (1 Reply)
Hello!
Everytime when a specific binaryfile grows (in 4 byte steps) I want to get the newest 2 bytes immediately when they occur. That can be done by
tail -f binfile but I need the bytes in hex format. Therefore I use hexdump
tail -f binfile | hexdump -xwhat only prints out complete lines of... (6 Replies)
Hello!
Have some problem with extract files from saved session.
File contains any kind of special/printable characters.
DATA NumberA DATA
DATA Begin
DATA1.1
DATA1.2 NumberB1 DATA1.3
DATA1.4
End DATA
DATA
DATA Begin
DATA2.1
DATA2.2 NumberB2 DATA2.3
DATA2.4
End DATA
DATA
... (4 Replies)
Hi
I need to display the binary text of an clearn text which is sent as input to the shell script (c shell);
ex: I will pass "HELLO" as input, and i should get the binary format of the text
Thanks in advance
Mohan (1 Reply)
Hello *nix specialists,
Im working for a non profit organisation in Germany to transport DSL over WLAN to people in areas without no DSL. We are using Linksys WRT 54 router with DD-WRT firmware There are at the moment over 180 router running but we have to change some settings next time. So my... (7 Replies)
I have a huge files in binary format
thanks to help me in finding a way to convert these files from Binary format to ASCII format. (0 Replies)
Discussion started by: PRINCESS_RORO
0 Replies
LEARN ABOUT PHP
substr
SUBSTR(3) 1 SUBSTR(3)substr - Return part of a stringSYNOPSIS
string substr (string $string, int $start, [int $length])
DESCRIPTION
Returns the portion of $string specified by the $start and $length parameters.
PARAMETERS
o $string
- The input string. Must be one character or longer.
o $start
- If $start is non-negative, the returned string will start at the $start'th position in $string, counting from zero. For
instance, in the string ' abcdef', the character at position 0 is ' a', the character at position 2 is ' c', and so forth. If
$start is negative, the returned string will start at the $start'th character from the end of $string. If $string is less than or
equal to $start characters long, FALSE will be returned.
Example #1
Using a negative $start
<?php
$rest = substr("abcdef", -1); // returns "f"
$rest = substr("abcdef", -2); // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"
?>
o $length
- If $length is given and is positive, the string returned will contain at most $length characters beginning from $start (depend-
ing on the length of $string). If $length is given and is negative, then that many characters will be omitted from the end of
$string (after the start position has been calculated when a $start is negative). If $start denotes the position of this trunca-
tion or beyond, false will be returned. If $length is given and is 0, FALSE or NULL, an empty string will be returned. If
$length is omitted, the substring starting from $start until the end of the string will be returned.
Example #2
Using a negative $length
<?php
$rest = substr("abcdef", 0, -1); // returns "abcde"
$rest = substr("abcdef", 2, -1); // returns "cde"
$rest = substr("abcdef", 4, -4); // returns false
$rest = substr("abcdef", -3, -1); // returns "de"
?>
RETURN VALUES
Returns the extracted part of $string; or FALSE on failure, or an empty string.
CHANGELOG
+--------------+---------------------------------------------------+
| Version | |
| | |
| | Description |
| | |
+--------------+---------------------------------------------------+
|5.2.2 - 5.2.6 | |
| | |
| | If the $start parameter indicates the position |
| | of a negative truncation or beyond, false is |
| | returned. Other versions get the string from |
| | start. |
| | |
+--------------+---------------------------------------------------+
EXAMPLES
Example #3
Basic substr(3) usage
<?php
echo substr('abcdef', 1); // bcdef
echo substr('abcdef', 1, 3); // bcd
echo substr('abcdef', 0, 4); // abcd
echo substr('abcdef', 0, 8); // abcdef
echo substr('abcdef', -1, 1); // f
// Accessing single characters in a string
// can also be achieved using "square brackets"
$string = 'abcdef';
echo $string[0]; // a
echo $string[3]; // d
echo $string[strlen($string)-1]; // f
?>
Example #4
substr(3) casting behaviour
<?php
class apple {
public function __toString() {
return "green";
}
}
echo "1) ".var_export(substr("pear", 0, 2), true).PHP_EOL;
echo "2) ".var_export(substr(54321, 0, 2), true).PHP_EOL;
echo "3) ".var_export(substr(new apple(), 0, 2), true).PHP_EOL;
echo "4) ".var_export(substr(true, 0, 1), true).PHP_EOL;
echo "5) ".var_export(substr(false, 0, 1), true).PHP_EOL;
echo "6) ".var_export(substr("", 0, 1), true).PHP_EOL;
echo "7) ".var_export(substr(1.2e3, 0, 4), true).PHP_EOL;
?>
The above example will output:
1) 'pe'
2) '54'
3) 'gr'
4) '1'
5) false
6) false
7) '1200'
ERRORS /EXCEPTIONS
Returns FALSE on error.
Example #5
<?php
var_dump(substr('a', 1)); // bool(false)
?>
SEE ALSO strrchr(3), substr_replace(3), preg_match(3), trim(3), mb_substr(3), wordwrap(3), String access and modification by character.
PHP Documentation Group SUBSTR(3)