variable variables interesting ??

$foo = “Variable!\n”;
$bar = “foo”;
$wom = “bar”;
$bat = “wom”;
print $foo;
print $$bar;
print $$$wom;
print $$$$bat;
Here if you will print the output you will get
Variable! Variable! Variable! Variable!

what is the difference between “23″ and “\x23″

023 is octal number where as x23 is a hex number.

how to find difference between two revisions in svn

shell > svn diff -r filename
It will show +++++ where the changes had been done.

how to get number of arguments in functions

well we can get it by using “func_num_args“
most important thing is that we have to call this function inside the called function
like
function example(1,2,3)
{
$num=func_num_args();
return $num;
}

how can you call the constructor for parent class

parrent :: constructor($value)
example is :
class A {
function example() {
echo “I am A::example() and provide basic functionality.\n”;
}
}
class B extends A {
function example() {
echo “I am B::example() and provide additional functionality.\n”;
[...]

how can we send mail through javascript

Here we can send email by using “mailto” function in javascript
here is the script to do the task
function sendEmail(formName)
{
var inputMessage=document.formName.msgbox.value;
location=”mailto:emailaddress@domainname.com?subject=hi&message=”+inputMessage;
return true;
}

how to open your pc in 10 seconds

Follow the following steps:
1) Press start button .
2) Click on run
3) write regedit and press enter
4) search for HKEY_LOACAL_MECHINE\SYSTEM\CurrentControlSet\Control\ContentIndex
5) now there u find the “Startup Delay”
6) double click on it . its default value is 4800000 (75300:hexadecimal)
7) change the setting to 400000
restart your computer and you are all set.

how to start/stop mysql in windows in dos

DOS > net start mysql
this will start mysql
DOS> net stop mysql
this will stop mysql

mysql transaction

it is the set of instructions or queries i.e is either executed or rolled backas a single atomic unit.
berkeleyDB and mysql are two storage engines that support mysql transaction.

mysql table locks

There is 3 types of table locking.
1) table level locking // locks the entire table
2) page level locking // locks some [...]