在对类执行100w次循环后， 常量最快，变量其次，静态变量消耗时间最高
其中：
常量消耗：101.1739毫秒
变量消耗：2039.7689毫秒
静态变量消耗：4084.8911毫秒
测试代码：
class Timer_profiler {public static $begin_timer;public static $finish_timer;public static $timer_html;/*** 计算时间差* @return type*/public static function getRecordTimer() {return (self::getFinishTimer() - self::getBeginTimer()) * 1000;}/*** 生成输出HTML* @param type $message* @return type*/public static function recordHtml($message = '') {self::setFinishTimer();return "<p>{$message}耗时： " . self::getRecordTimer() . " 毫秒</p>";}/*** 设置开始时间*/public static function setBeginTimer() {self::$begin_timer = self::getTime();}/*** 设置结束时间*/public static function setFinishTimer() {self::$finish_timer = self::getTime();}/*** 获取开始时间* @return type*/public static function getBeginTimer() {return self::$begin_timer;}/*** 获取结束时间* @return type*/public static function getFinishTimer() {return self::$finish_timer;}/*** 获取带微妙的时间戳 * @return type*/private static function getTime() {list($usec, $sec) = explode(" ", microtime());return (number_format($sec+$usec,6,'.', ''));}}function computeTime($otime,$message){return;$ntime = xdebug_time_index();$str = '';$str .= $message . ($ntime*1000-$otime*1000);$str .= "<br>";echo $str;}function getMemoryUsed(){$str = '消耗内存<h3 style="color:red"> ';$str .= round(memory_get_usage()/1024/1024, 4).'MB';$str .= '</h3>';echo $str;}$count_i = 100*10000;//$count_i = 100000;Timer_profiler::setBeginTimer();computeTime(xdebug_time_index(),'开始执行');echo Timer_profiler::recordHtml('开始执行');getMemoryUsed();class TestVar {public $A1 = 'aaaaaaaaaaaaaaaaa';public $A2 = 'aaaaaaaaaaaaaaaaa';public $A3 = 'aaaaaaaaaaaaaaaaa';public $A4 = 'aaaaaaaaaaaaaaaaa';public $A5 = 'aaaaaaaaaaaaaaaaa';public $A6 = 'aaaaaaaaaaaaaaaaa';public $A7 = 'aaaaaaaaaaaaaaaaa';public $A8 = 'aaaaaaaaaaaaaaaaa';}$TestVar = new TestVar();for($i=0;$i<=$count_i;$i++){$t = $TestVar->A1;$t = $TestVar->A2;$t = $TestVar->A3;$t = $TestVar->A4;$t = $TestVar->A5;$t = $TestVar->A6;$t = $TestVar->A7;$t = $TestVar->A8;}getMemoryUsed();echo Timer_profiler::recordHtml('变量完成');computeTime(xdebug_time_index(),'变量完成');Timer_profiler::setBeginTimer();class TestStaticVar {static $A1 = 'aaaaaaaaaaaaaaaaa';static $A2 = 'aaaaaaaaaaaaaaaaa';static $A3 = 'aaaaaaaaaaaaaaaaa';static $A4 = 'aaaaaaaaaaaaaaaaa';static $A5 = 'aaaaaaaaaaaaaaaaa';static $A6 = 'aaaaaaaaaaaaaaaaa';static $A7 = 'aaaaaaaaaaaaaaaaa';static $A8 = 'aaaaaaaaaaaaaaaaa';}for($i=0;$i<=$count_i;$i++){$t = TestStaticVar::$A1;$t = TestStaticVar::$A2;$t = TestStaticVar::$A3;$t = TestStaticVar::$A4;$t = TestStaticVar::$A5;$t = TestStaticVar::$A6;$t = TestStaticVar::$A7;$t = TestStaticVar::$A8;}getMemoryUsed();echo Timer_profiler::recordHtml('静态变量完成');computeTime(xdebug_time_index(),'静态变量完成');Timer_profiler::setBeginTimer();class TestConstVar {const A1 = 'aaaaaaaaaaaaaaaaa';const A2 = 'aaaaaaaaaaaaaaaaa';const A3 = 'aaaaaaaaaaaaaaaaa';const A4 = 'aaaaaaaaaaaaaaaaa';const A5 = 'aaaaaaaaaaaaaaaaa';const A6 = 'aaaaaaaaaaaaaaaaa';const A7 = 'aaaaaaaaaaaaaaaaa';const A8 = 'aaaaaaaaaaaaaaaaa';}for($i=0;$i<=$count_i;$i++){$t = TestConstVar::A1;$t = TestConstVar::A2;$t = TestConstVar::A3;$t = TestConstVar::A4;$t = TestConstVar::A5;$t = TestConstVar::A6;$t = TestConstVar::A7;$t = TestConstVar::A8;}getMemoryUsed();echo Timer_profiler::recordHtml('常量完成');computeTime(xdebug_time_index(),'常量完成');//echo Timer_profiler::recordHtml('共执行');computeTime(xdebug_time_index(),'共执行');exit;
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