php测试性能代码

php测试性能代码

function microtime_float ()
{
    list ($usec, $sec) = explode(" ", microtime());
    return ((float) $usec + (float) $sec);
}
function echotime ($name)
{
    static $t_start = 0;
    $t_end = microtime_float();
    if ($name != 'start') {
        $time = $t_end - $t_start;
        echo ($name . ':');
        echo intval($time * 1000);
        echo "
\n";
    }
    $t_start = $t_end;
}
$index = 1000;
$loop = 10000;
$length = 10000;
$key = "abc" . $index;
$array = array();
for ($i = 0; $i     $array['abc' . $i] = 'abc' . $i;
}
echotime('start');
for ($i = 0; $i     if (array_key_exists($key, $array)) {
        $a = true;
    }
}
echotime('array_key_exists');
for ($i = 0; $i     if (isset($array[$key])) {
        $a = true;
    }
}
echotime('isset');
for ($i = 0; $i     if (in_array($key, $array)) {
        $a = true;
    }
}
echotime('in_array');
for ($i = 0; $i     if (array_search($key, $array)) {
        $a = true;
    }
}
echotime('array_search');
$array2 = array_flip($array);
for ($i = 0; $i     if (isset($array2[$key])) {
        $a = true;
    }
}
echotime('flip and search');
$array2 = $array;
foreach ($array2 as $k => $v) {
    $array2[$k] = strtoupper($v);
}
echotime('foreach1');
$array2 = $array;
foreach ($array2 as &$v) {
    $v = strtoupper($v);
}
echotime('foreach2');
$array2 = $array;
$array2 = array_map('strtoupper', $array2);
echotime('array_map');