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

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