What will be the output of the following code?

$var1="a";

$$var1="b";

echo "$var1 $a";

Which help to keep an eye on the existing number of objects of a given class without introducing a non-class member variable?

Which is correct regarding Linux devices?

Which statement is true? Statement 1: mysql_fetch_object - Returns an object with properties that correspond to the fetched row, or FALSE if there are no more rows Statement 2: mysql_fetch_row - Returns a positive MySQL result resource to the query result, or FALSE on error.

Which statement is incorrect regarding referential integrity?

'Perfect Services' provides financial services worldwide. You want to display data from the table pers for joining_date from #1/1/2005# to #31/12/2005# and the job should either be of an analyst, a clerk or a salesman. Which is correct?

What will happen if AUTO INCREMENT field reaches its maximum value?

What is the output of the command "service httpd configtest" if no errors are found in Apache's configuration file?

The command "service httpd ______" allows users to check the syntax of Apache's configuration files.

In which tcp_wrappers file can you specify all connections from all hosts?

The SELinux (Security Enhanced Linux) security policies are enabled/disabled through which file?