Hashing is a process for message digest. Hash value is the collection of text.
Producing hash values for accessing data or for security. A hash value (or simply hash), also called a message digest, is a number generated from a string of text. The hash is substantially smaller than the text itself, and is generated by a formula in such a way that it is extremely unlikely that some
Hashing is also a common method of accessing data records. Consider, for example, a list of names:
John Smith
Sarah Jones
Roger Adams
To create an index, called a hash table, for these records, you would apply a formula to each name to produce a unique numeric value. So you might get something like:
1345873 John smith
3097905 Sarah Jones
4060964 Roger Adams
Then to search for the record containing Sarah Jones, you just need to reapply the formula, which directly yields the index key to the record. This is much more efficient than searching through all the records till the matching record is found.
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Basically it has three core feature.
1. It retains the value between function calls.
2.By default function is extern..so it will be visible from other files if the function declaration is as static..it is invisible for the outer files
3. By default we can use the global variables from outside files If it is static global..that variable is limited to with in the file.
#include <stdio.h>
int variable = 10;
main(){
int i = 0;
void useStatic();
useStatic();
printf("after 1st call \n");
useStatic();
printf("after 2nd call \n");
useStatic();
printf("after IIIrd call \n");
}
void useStatic()
{
static int j = 0;
int k = 10;
printf("value of j %d k %d",j,k);
j=j+10;
} |
value of j 0 k 10 After 1st call
value of j 10 k 10 After IInd call
value of j 20 k 10 After IIUrd call
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There are number of way to generate unique number or id in mysql and php.
Using Rand() function. we can get random data with in limit
SELECT * FROM company ORDER BY RAND() LIMIT 10
<?
echo str_replace ("}","",str_replace("{","",com_create_guid()));
?>
<? $number = mt_rand(500,1000); ?>
<? $uniqid = date('U') . mt_rand(0,9); ?>
<? echo time();?>
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There are number of way to get file extension in php.
-
function getFileExtension($filename)
-
{
-
-
return $fileinfo['extension'];
-
}
$ext = end(explode(‘.’, $file));
$ext = substr(strrchr($file, ‘.’), 1);
$ext = substr($file, strrpos($file, '.') + 1);
$ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $file);
$exts = split("[/\\.]", $file);
$n = count($exts)-1;
$ext = $exts[$n];
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you can use below code to show all child of
parent who has id 10.
<?php wp_list_cats('child_of=10'); ?>
you can also use this
<?php wp_list_pages('child_of=10&
sort_column=post_title&title_li=') ?>
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<?php
if($post->post_parent) {
$parent_title = get_the_title($post->post_parent);
echo $parent_title;
} else {
wp_title('');
}
?>
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If you fired a query, that takes more time to complete their execution.
but you want to stop this query.
To stop this query you must use Kill command to achieve it.
Follow two step to kill your query.
mysql> SHOW PROCESSLIST;
above command will show all running process on the server.
Here you will see thread ID return by above command.
mysql> KILL 22;
kill thread 22 to kill your query.
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