codice:function getmicrotime(){ list($usec, $sec) = explode(" ",microtime()); return ((float)$usec + (float)$sec); } $time_start = getmicrotime(); //for ($i=0; $i < 1000; $i++){ // //do nothing, 1000 times // } $st=mysql_query("SELECT * FROM tabella"); $time_end = getmicrotime(); $time = $time_end - $time_start; echo "Did nothing in $time seconds";