Collation of microtime related knowledge in PHP

Class RunTime { var $StartTime = 0; var $StopTime = 0; var $TimeSpent = 0; function Start () { $this->starttime = Microtime (); } function Stop () { $this->stoptime = Microtime (); } function spent () { if ($this->timespent) { return $this->timespent; } else { $StartMicro = substr ($this->starttime,0,10); $StartSecond = substr ($this->starttime,11,10); $StopMicro = substr ($this->stoptime,0,10); $StopSecond = substr ($this->stoptime,11,10); $start = Floatval ($StartMicro) + $StartSecond; $stop = Floatval ($StopMicro) + $StopSecond; $this->timespent = $stop-$start; Return round ($this->timespent,8); } }//End Function } Copy Code Annotations: 1. Why is the encapsulation defective? In the process of use, I found that the properties of those classes, there is no need to appear as VAR (public), since the use of class, then follow the next object-oriented basic rules, these variables can be fully controlled with private access. 2. Microtime used well enough? Some notes on Microtime in the manual: Definition and Usage the Microtime () function returns the current Unix timestamp and the number of microseconds. If called without optional arguments, this function returns a string in the format "msec sec", where the SEC is the number of seconds since the Unix era (0:00:00 January 1, 1970 GMT) and msec is the microsecond portion. The two parts of a string are returned in seconds. In PHP5 or above, you can accept the parameter true so that you can return the floating-point number directly, and it will be much more efficient than it is now. Here is a small code found on the Internet, can be used as a reference: function Microtime_float3 () { Return Microtime (TRUE); } function Microtime_float2 () { if (Php_version > 5) { Return Microtime (TRUE); }else{ List ($usec, $sec) = Explode ("", Microtime ()); return (float) $usec + (float) $sec); } } function Microtime_float () { List ($usec, $sec) = Explode ("", Microtime ()); return (float) $usec + (float) $sec); } function Runtime ($t 1) { Return Number_format ((Microtime_float ()-$t 1) *1000, 4). ' Ms '; } $t 1 = microtime_float (); for ($i =0; $i <10000; $i + +) { Microtime_float (); } echo "microtime_float====="; Echo Runtime ($t 1). ' '; $t 1 = microtime (true); for ($i =0; $i <10000; $i + +) { Microtime (TRUE); } echo "microtime_true====="; Echo Runtime ($t 1). ' '; $t 1 = microtime (true); for ($i =0; $i <10000; $i + +) { MICROTIME_FLOAT2 (); } echo "microtime_float2====="; Echo Runtime ($t 1). ' '; $t 1 = microtime (true); for ($i =0; $i <10000; $i + +) { MICROTIME_FLOAT3 (); } echo "microtime_float3====="; Echo Runtime ($t 1). ' '; ?> Copy Code Native WinXP run Result: microtime_float=====109.5631ms microtime_true=====38.8160ms microtime_float2=====52.7902ms microtime_ Float3=====45.0699ms running results on Linux: microtime_float=====47.2510ms microtime_true=====9.2051ms microtime_float2===== 16.3319ms microtime_float3=====12.2800ms

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