Hi
I have a text file which has two sets of lines repeating for "n" number of times.Some data is printed between the two lines.I want to retrieve all the data thats there in between those two set of lines.I have the string value of those two set of lines.
To be much more clearer
... (4 Replies)
Hi there, if i had a file that looked like this
my_server1
red
green
blue
yellow
blue
my_server2
blue
blue
yellow
green
blue
my_server3
yellow (9 Replies)
I'm having trouble with extracting certain lines from a file based on whether they have all the required fields.
Original file:
snt:594:Sam N This
bpt:2342:Bob P That
lr:123
wrp:23:Whoever Person
cor:794
Desired output:
snt:594:Sam N This
bpt:2342:Bob P That
wrp:23:Whoever Person
... (3 Replies)
Hi,
I have one file, say file 1, that has data like below where 19900107 is the date,
19900107 12 144 129 0.7380047
19900108 12 168 129 0.3149017
19900109 12 192 129 3.2766666E-02
... (3 Replies)
Hi everybody,
I'd like to think I've been through the search tool not only on this site, but also on google too, but I haven't been able to find what I was looking for. If I might've missed something on this forum, please slap me in the face with a link that you consider useful for my query :D
... (4 Replies)
Hell,
I want to grep certain word from file and display above 2 lines and after two lines.
Here is the content of sample file.
Mar 14, 2013 12:56:59 AM Agent.Agent SendTo
INFO: Connection to server:7041 - Credential Transmit Successesful
Mar 14, 2013 8:54:21 AM cgent SendTo
WARNING:... (7 Replies)
Hello
I have a file with nearly 90000 lines in x,y,z format but have some lines that I do not need to show. Is there anyway to delete those 3 lines after every 288 lines.
Eg I keep the first 288 lines delete (289, 290 291); keep the next 288 lines after those and so on...
Thanks (6 Replies)
Discussion started by: Madiouma Ndiaye
6 Replies
LEARN ABOUT PHP
openssl_random_pseudo_bytes
OPENSSL_RANDOM_PSEUDO_BYTES(3) 1 OPENSSL_RANDOM_PSEUDO_BYTES(3)openssl_random_pseudo_bytes - Generate a pseudo-random string of bytesSYNOPSIS
string openssl_random_pseudo_bytes (int $length, [bool &$crypto_strong])
DESCRIPTION
Generates a string of pseudo-random bytes, with the number of bytes determined by the $length parameter.
It also indicates if a cryptographically strong algorithm was used to produce the pseudo-random bytes, and does this via the optional
$crypto_strong parameter. It's rare for this to be FALSE, but some systems may be broken or old.
PARAMETERS
o $length
- The length of the desired string of bytes. Must be a positive integer. PHP will try to cast this parameter to a non-null integer
to use it.
o $crypto_strong
- If passed into the function, this will hold a boolean value that determines if the algorithm used was "cryptographically
strong", e.g., safe for usage with GPG, passwords, etc. TRUE if it did, otherwise FALSE
RETURN VALUES
Returns the generated string of bytes on success, or FALSE on failure.
EXAMPLES
Example #1
openssl_random_pseudo_bytes(3) example
<?php
for ($i = -1; $i <= 4; $i++) {
$bytes = openssl_random_pseudo_bytes($i, $cstrong);
$hex = bin2hex($bytes);
echo "Lengths: Bytes: $i and Hex: " . strlen($hex) . PHP_EOL;
var_dump($hex);
var_dump($cstrong);
echo PHP_EOL;
}
?>
The above example will output something similar to:
Lengths: Bytes: -1 and Hex: 0
string(0) ""
NULL
Lengths: Bytes: 0 and Hex: 0
string(0) ""
NULL
Lengths: Bytes: 1 and Hex: 2
string(2) "42"
bool(true)
Lengths: Bytes: 2 and Hex: 4
string(4) "dc6e"
bool(true)
Lengths: Bytes: 3 and Hex: 6
string(6) "288591"
bool(true)
Lengths: Bytes: 4 and Hex: 8
string(8) "ab86d144"
bool(true)
SEE ALSO random_bytes(3), bin2hex(3), crypt(3), mt_rand(3), uniqid(3).
PHP Documentation Group OPENSSL_RANDOM_PSEUDO_BYTES(3)