floating point - How to print a very small float value in php? -

i have function print calculate loading time of each page:

function microtime_float() {     list($usec, $sec) = explode(" ", microtime());     return ((float)$usec + (float)$sec); }  $time_start = microtime_float();  $time_end = microtime_float(); $time = $time_end - $time_start; 

but when echo $time, this:

5.60283660889e-5 

but have value 0.000000000000xxxx, how can convert this? thank you.

there's no need "float" function, do

$time_start = microtime(true); 

which returns value float.

to display decimals, try

printf('%.16f', $time); 

which tells php format float 16 decimal places of output.