PHP生成唯一订单号的四种方法

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return date('Ymd') . str_pad(mt_rand(1, 99999), 5, '0', STR_PAD_LEFT);

return date('Ymd') . str_pad(mt_rand(1, 99999), 5, '0', STR_PAD_LEFT);

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return date('Ymd').substr
(implode(NULL, array_map('ord', str_split(substr(uniqid(), 7, 13), 1))), 0, 8);

return date('Ymd').substr (implode(NULL, array_map('ord', str_split(substr(uniqid(), 7, 13), 1))), 0, 8);

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public function make_order($user_id)
{
 return mt_rand(10,99)
 . sprintf('%010d',time() - 946656000)
 . sprintf('%03d', (float) microtime() * 1000)
 . sprintf('%03d', (int) $user_id % 1000);
}

public function make_order($user_id) { return mt_rand(10,99) . sprintf('%010d',time() - 946656000) . sprintf('%03d', (float) microtime() * 1000) . sprintf('%03d', (int) $user_id % 1000); }

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$yCode = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J');
$orderSn = $yCode[intval(date('Y')) - 2011] . strtoupper
(dechex(date('m'))) . date('d') . substr(time(), -5)
 . substr(microtime(), 2, 5) . sprintf('%02d', rand(0, 99));

$yCode = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'); $orderSn = $yCode[intval(date('Y')) - 2011] . strtoupper (dechex(date('m'))) . date('d') . substr(time(), -5) . substr(microtime(), 2, 5) . sprintf('%02d', rand(0, 99));