Why does my float store in MYSQL as .9999 when it's greater than 1?

Question

I'm storing process time in a MySQL database as a float(4,4).

$start_time = microtime( TRUE );

// things happen in my script

$end_time = microtime( TRUE );
$process_time = $end_time - $start_time;

// insert $process time into mysql table

$process_time always displays correctly when outputted to the command line, but if it's value is greater than 1, it stores into mysql as .9999.

What gives?

Answer 1

float(4,4) means total 4 digits, 4 of them are after the decimal point. So you have to change to 10,4 for example

MySQL permits a nonstandard syntax: FLOAT(M,D) or REAL(M,D) or DOUBLE PRECISION(M,D). Here, “(M,D)” means than values can be stored with up to M digits in total, of which D digits may be after the decimal point.