How to get the current millisecond timestamp in php

php method to get the current millisecond timestamp: use the [microtime()] function to get it, the code is [list($msec, $sec) = explode(' ', microtime());].

php method to get the current millisecond timestamp:

provides a microtime() function. If called Without optional parameters, this function returns a string in the format "msec sec", where sec is the number of seconds since the Unix epoch (0:00:00 January 1, 1970 GMT) and msec is the microsecond portion . Both parts of the string are returned in seconds.

Detailed description of microtime() function

<?php
echo microtime();
//输出结果是
//0.25139300 1138197510

Note that its result is divided into two parts, that is, the first half is milliseconds (but the unit is seconds) , the second half is seconds.

Now, we make modifications based on this, as follows:

<?php
list($msec, $sec) = explode(&#39; &#39;, microtime());
$msectime = (float)sprintf(&#39;%.0f&#39;, (floatval($msec) + floatval($sec)) * 1000);

That’s it, $msectime is the current number of milliseconds! These two lines can be encapsulated into a function for easy use.

<?php
//返回当前的毫秒时间戳
function msectime() {
　　list($msec, $sec) = explode(&#39; &#39;, microtime());
　　$msectime = (float)sprintf(&#39;%.0f&#39;, (floatval($msec) + floatval($sec)) * 1000);
　　return $msectime;
}

Note: sprintf('%.0f', $num) outputs a floating point number without a decimal part

The thing is not over yet. After I changed the timestamp to millisecond level, When the database data was updated again, it was prompted that it was out of range. It turned out that I used int type to store the second-level timestamp obtained by the time() function in the database. The storage range was sufficient. If I changed it to millisecond level, I had to change it. It is of BIGINT type.

integer type byte range (with symbols) range (non-symbol) use

Tinyint 1 byte (-128, 127) (0,255) small integer Value

SMALLINT                   2 bytes                                                                                                         ( 65 535)                                               ’ to 3 byte       through ’’’’ out's ’ ’ s ’ through   ’ through through ’’'' through'''' through through‐‐to‐to‐‐‐under‐ coming to 3 bytes to be 88 608, 8 388 607) (0 , 16 777 215) Large integer value

INT or INTEGER 4 bytes (-2 147 483 648, 2 147 483 647) (0, 4 294 967 295) Large integer value

BIGINT 8 bytes (-9 233 372 036 854 775 808, 9 223 372 036 854 775 807) (0, 18 446 744 073 709 551 615) Very large integer value

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