Test array_key_exists()

array_key_exists_test.php

<?php

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

define ("TESTARRAY_MIN", 1);
define ("TESTARRAY_MAX", 10000);
define ("WINNERARRAY_MAX", 10);
define ("MEASURE_MAX", 10);

srand ((double) microtime() * 1000000);
$j = rand ();
$testArr = array ();
for ($i = TESTARRAY_MIN; $i < TESTARRAY_MAX; $i++) {
    $testArr[$i] = $i * $j;
}

srand ((double) microtime () * 1000000);
$winnerArr = array ();
for ($i = 0; $i < WINNERARRAY_MAX; $i++) {
    $winnerArr[] = rand (TESTARRAY_MIN, TESTARRAY_MAX);
}

$measureArr = array ();
$trash = 0;
for ($i = 0; $i < MEASURE_MAX; $i++) {
    $starttime = getmicrotime ();
    foreach ($winnerArr as $key) {
        if (array_key_exists ($key, $testArr)) {
            $trash = $testArr[$key];
        }
    }
    $measureArr[$i][0] = getmicrotime() - $starttime;

    $starttime = getmicrotime ();
    foreach ($winnerArr as $key) {
        if (isset ($testArr[$key])) {
            $trash = $testArr[$key];
        }
    }
    $measureArr[$i][1] = getmicrotime() - $starttime;
}

$average = 0;
foreach ($measureArr as $value) {
    $average += $value[0] * 100.00 / $value[1];
}
printf ('%01.2f', ($average / MEASURE_MAX));

?>

Related post: http://lloc.de/haende-weg-von-array_key_exists.html