Which symbol is used for creating a variable in PHP?

What will be the output?

<?php

$a = 10+10*5+15/5;

echo "$a";

?>

Who is the father of PHP?

What will be the output?

<?php

if($a=0){

    echo "Sun";

}

else{

    echo "Moon";

}

?>

What will be the output?

<?php

$a=0;

$b=0;

for($i=0;$i<10;$i++)

{

      if(++$a<5 && $b++<7){  }

}

echo $a." ".$b;

?>

Which of the following is/are an exception?

i) OutOfBoundException
ii) OutOfRangeException
iii) OverflowException
iv) UnderflowException

Which of the following are exceptions?

i) BadFunctionCallException
ii) BadMethodCallException
iii) LogicException
iv) DomainException

 What will be the output of the following PHP code? 

<?php

function a()

{

   function b()

   {

       echo 'I am b';

   }

   echo 'I am a';

}

a();

?>

 Which function initializes the constants necessary for using the openlog(), clodelog(), and syslog() functions? 

What will be the output of the following PHP code?

<?php

$num = "123";

if (!filter_var($num, FILTER_VALIDATE_INT))

echo("Integer is not valid");

else

echo("Integer is valid");

?>