Creating PHP class instance with a string

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Yes, you can!

$str="One";
$class="Class".$str;
$object = new $class();

When using namespaces, supply the fully qualified name:

$class="\Foo\Bar\MyClass"; 
$instance = new $class();

Other cool stuff you can do in php are:
Variable variables:

$personCount = 123;
$varname="personCount";
echo $$varname; // echo's 123

And variable functions & methods.

$func="my_function";
$func('param1'); // calls my_function('param1');

$method = 'doStuff';
$object = new MyClass();
$object->$method(); // calls the MyClass->doStuff() method.

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