php 获取毫秒级时间戳的方法实例代码

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;