Question on PHP variable allocation

[bigD]

I have a question on when PHP will allocate space in the code.  Does it happen up front, or as the code executes?

 

// some stuff

if (some_conditional)
{
     // something happens here and returns or exits
}

// we never get here

$foo = array();

exit(0);

 

In this example, does $foo get created?

[roopurt18]

No.  $foo is not created.

 

<?php
// some stuff

if (some_conditional)
{
     // something happens here and returns or exits
     echo var_export( isset( $foo ), true ) . PHP_EOL;
     exit();
}

// we never get here

$foo = array();

exit(0);
?>

[bigD]

No.  $foo is not created.

Thank you.