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HomeBackend DevelopmentPHP TutorialPHP method example code for obtaining millisecond timestamp

这篇文章主要介绍了PHP获取毫秒级时间戳的方法,涉及php针对microtime函数返回结果的处理技巧,非常简单实用,需要的朋友可以参考下

本文实例讲述了PHP获取毫秒级时间戳的方法。分享给大家供大家参考。具体分析如下:

PHP本身没有提供获取毫秒级时间戳的函数,java里面可以通过gettime();获取。如果是要与java写的某些程序进行高精度的毫秒级的对接通信,则需要使用PHP输出毫秒级的时间。之前我采取的方法是采用不精准的方式,也就是在PHP原生的时间函数后面加上一个三位数字构成。为获取更为精准的毫秒级时间戳可以使用下面的代码:

function getMillisecond() { 
    list($s1, $s2) = explode(' ', microtime()); 
    return (float)sprintf('%.0f', (floatval($s1) + floatval($s2)) * 1000); 
}

/* 
     * 获取时间差,毫秒级 
     */  
      
    function get_subtraction()  
    {  
            $t1 = microtime(true);  
            $t2 = microtime(true);  
            return (($t2-$1)*1000).'ms';  
    }
    
    /* 
     * microsecond 微秒     millisecond 毫秒 
     *返回时间戳的毫秒数部分 
     */  
    function get_millisecond()  
    {  
            list($usec, $sec) = explode(" ", microtime());  
            $msec=round($usec*1000);  
            return $msec;  
               
    }  
       
    /* 
     * 
     *返回字符串的毫秒数时间戳 
     */  
    function get_total_millisecond()  
    {  
            $time = explode (" ", microtime () );   
            $time = $time [1] . ($time [0] * 1000);   
            $time2 = explode ( ".", $time );   
            $time = $time2 [0];  
            return $time;  
    }  
      
    /* 
     * 
     *返回当前 Unix 时间戳和微秒数(用秒的小数表示)浮点数表示,常用来计算代码段执行时间 
     */  
       
    function microtime_float()  
    {  
        list($usec, $sec) = explode(" ", microtime());  
        return ((float)$usec + (float)$sec);  
    }
    
    $millisecond = get_millisecond();
    $millisecond = str_pad($millisecond,3,'0',STR_PAD_RIGHT);
    echo date("YmdHis").$millisecond;

PS:在32位系统中php的int最大值远远小于毫秒数,所以不能使用int类型,而php中没有long类型,所以只好使用浮点数来表示。由于使用了浮点数,如果精度设置不对,使用echo显示获取的结果时可能会不正确,要想看到输出正确的结果,精度设置不能低于13位。

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