PHP实现记录代码运行时间封装类实例教程

class TimeCost{ private $cost = array(); private $record = array(); private $scale = 6; public function __construct($scale = 6) { $this->cost = array(); $this->record = array(); $this->scale = $scale; } public function __toString() { return $this->getString(); } /** * start to cal time. * * @param mixed $key */ public function addCost($key) { $this->cost[$key] = microtime(true); } /** * stop to cal time. * * @param mixed $key */ public function closeCost($key) { $cost = bcsub(microtime(true), $this->cost[$key], $this->scale); if (in_array($key, array_keys($this->record))) {  $this->record[$key] = bcadd($cost, $this->record[$key], $this->scale); } else {  $this->record[$key] = $cost; } return $cost; }  public function getString($key = null) { if ($key) {  return "{$key}[{$this->record[$key]}]"; } $str = ''; foreach ($this->record as $k => $v) {  $str .= "{$k}[{$v}]"; } return $str; }}

$obj = new TimeCost();$token = 'test_a';$obj->addCost($token);some_code();$obj->closeCost($token);$reslut = $obj->getString($token);