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Swank, скорость file_get_contents 1.062059879303 секунд
скорость fopen 1.1420660018921 секунд

function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

$time_start = microtime_float();

for ($i = 1; $i < 10000; $i++) {
   $ai = file_get_contents('koeimg.php');
}

$time_end = microtime_float();
$time = $time_end - $time_start;

echo "скорость file_get_contents $time секунд<br />";

$time_start = microtime_float();

for ($i = 1; $i < 10000; $i++) {
   $handle = fopen('koeimg.php', "r");
   $ai = fread($handle, filesize('koeimg.php'));
   fclose($handle); 
}

$time_end = microtime_float();
$time = $time_end - $time_start;

echo "скорость fopen $time секунд<br />";