a day in the pit my view from inside

<?php
print_r($argv);
$runs = $argv[2];
echo "$iterations\n";
$data_size = $argv[4];
echo $data_size;
$big_set = array();
for($i = 1; $i < $data_size; $i++){
  $big_set[] = "Hello there ".rand(500,5000);
}
$to_diff = array();
for($i = 1; $i < $data_size; $i++){
  $to_diff[] = "Hello there ".rand(500,5000);
}
 
for ($i=0; $i<$runs; $i++) {
   $time = 0;
   $start = microtime(true);
   $diff = array_diff ($big_set, $to_diff);
   $t = microtime(true) - $start;
   $time += $t;
}
 
echo $runs, ' runs (php array diff): ', sprintf('%2.9f',$time/$runs), ' secs', BR;
 
for ($i=0; $i<$runs; $i++) {
   $time2 = 0;
   $start = microtime(true);
 
   foreach($big_set as $p) {
        unset($to_diff[0]); // cost of an associative array lookup & delete
   }
   $t = microtime(true) - $start;
   $time2 += $t;
}
 
echo $runs, ' runs (forloop): ', sprintf('%2.9f',$time2/$runs), ' secs <br />';
 
if($time2 > $time) {
    $seconds = $time2 - $time;
    echo "forloop slower by ". $seconds/$runs ." seconds";
}
else {
    $seconds = $time - $time2;
    echo "php array diff slower by ". $seconds/$runs ." seconds";
}