test_readfile_vs_file..

```
<?php
$file = "audio.mp3";
ob_start(); 
$start = microtime(true); 
echo file_get_contents($file); 
$end = microtime(true) - $start; 
ob_end_clean();

echo 'file_get_contents: '.$end;
echo "\n";

ob_start(); 
$start = microtime(true); 
echo readfile($file); 
$end = microtime(true) - $start; 
ob_end_clean();

echo 'readfile: '.$end;
echo "\n";


ob_start(); 
$start = microtime(true); 
echo exec('cat ~/htdocs/josek/'.$file); 
$end = microtime(true) - $start; 
ob_end_clean();

echo 'exec: '.$end;
echo "\n";