简单检测PHP运行效率脚本

<?php$stratTime ??= microtime(true);$startMemory = memory_get_usage();$a = 1;for($i = 1; $i <= 100000; $i++){ ???$a++;}echo $a;$endTime ???= microtime(true);$runtime ???= ($endTime - $stratTime) * 1000; //将时间转换为毫秒$endMemory ?= memory_get_usage();$usedMemory = ($endMemory - $startMemory) / 1024;echo "运行时间: {$runtime} 毫秒<br />";echo "耗费内存: {$usedMemory} K";