Benchmarking PHP page load times

Question

How could I measure the time taken to load a page (with various different PHP statements)?

Somewhat like the stats available here - http://talks.php.net/show/drupal08/24

Answer 1

1. method one: use xdebug.

2. method two: Put these statements all around your your scripts

   $TIMER['label']=microtime(1);
/* some code */
$TIMER['sql1_before']=microtime(1);
a/* some code */
$TIMER['sql1_after']=microtime(1);
/* some code */

and then output it, with code like this:

  echo "";
  reset($TIMER);
  $start=$prev=current($TIMER);
  $total=end($TIMER)-$start;
  foreach($TIMER as $name => $value) {
    $sofar=round($value-$start,3);
    $delta=round($value-$prev,3);
    $percent=round($delta/$total*100);
    echo "";
    $prev=$value;
  }
    echo "
name
so far
delta
per cent
$name
$sofar
$delta
$percent
";

Thus, you'll get tetailed report on how your code goes. this action called profiling and take most important place in the optimization process.