Count php script run time.

timeDebug.php

<?php

/**
 * PHP time debug
 * @param  string $mark
 * @param  string $separate
 * @return array
 */
function timeDebug($mark, $echo = true, $separate)
{
    global $timeDebug;
    $separate = $separate ?: (PHP_SAPI == 'cli' ? PHP_EOL : '<br>');

    $mt = microtime();
    if (!$mark) $mark = 'timeDebug';
    $timeDebug[$mark][] = (float) (substr((string) $mt, 17) . substr((string) $mt, 1, 6));
    $arr = $timeDebug[$mark];
    $endKey = count($arr) - 1;
    if (array_key_exists($endKey - 1, $arr)) {
        $timeDiff = sprintf('%.5f', $arr[$endKey] - $arr[$endKey - 1]);
        $separate = '    >> ' . $timeDiff . 's' . $separate;
        $markDiff = $endKey . '_' . $endKey - 1;
        $markDiffKey = $mark . '_diff';
        $timeDebug[$markDiffKey][$markDiff] = $timeDiff;
    }
    if ($echo) {
       echo $mark, '  ', date('Y-m-d H:i:s') . substr((string) microtime(), 1, 6), $separate;
    }
    return $timeDebug;
}

How to use?

<?php

timeDebug();

sleep(1);

timeDebug();

sleep(1);

timeDebug('forTime');

for ($i = 0; $i < 999999; $i++) {
    $a = count(['a', 'b', $i]);
}

timeDebug('forTime');

timeDebug();