Description:
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I noticed when timing my scripts that include_once is pretty slow when one looks at how simple of a job this function has.

I timed an example further down.

Please don't disregard this request just because it might not seem very important. If it can't be improved though, C is not my domain, nevermind and thanks for reading :)

Reproduce code:
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include_once(components_dir.'style.php');
/* 0.0026910305023193 seconds */


include_once(components_dir.'style.php'); 
/* 0.00091314315795898 seconds
   only three times as fast as the first include_once call! whereas the next example?*/


$array = array('somefile.php','somefile.php','somefile.php','somefile.php','somefile.php',
               'somefile.php','somefile.php','somefile.php','somefile.php','somefile.php');
in_array('someotherfile.php',$array);
/* only takes 0.000065088272094727 seconds and hence is 40x as fast (if my calculations are correct) */