The alternate PHP cache is free and open opcode cache for PHP.
http://en.wikipedia.org/wiki/Opcode

$variable= 'Iam ok';
apc_add('foo',$variable);
var_dump(apc_fetch('foo'));

the above code is not working as desired.
the output we get is “bool(false)”

http://www.techterms.com/definition/parse
-r code Run PHP code without using script tags ‘

Armstrong, Neil: The Eagle Has Landed