php - Simple round function doesn't round -

i'm trying round 1 value 8 symbol after decimal doesn't round anything. example:

12/653.44 result: 0.018364348677767 

i want round , output 8 symbols after ,. function:

public static function getusdrate() {   $urldata = get_curl_content('https://example.com/');   $rates = json_decode($urldata, true);   if (!$rates) {         return '-';   }   $usdrate = $rates['usd']['sell'];     if (!$usdrate) {         return '-';     }     return round($usdrate, 8); } 

function calling: $singles->price/getusdrate() when call function echoes whole number...

if want result have 8 decimals, should use:

echo round($singles->price/getusdrate(), 8); 

with information in question, can see rounding early, since perform more calculations later. remove rounding getusdrate() function.

if want 8 decimals in number display, rounding must performed after computations. modify getusdrate() function include rounding there:

public static function getusdrate($value) {   $urldata = get_curl_content('https://example.com/');   $rates = json_decode($urldata, true);   if (!$rates) {         return '-';   }   $usdrate = $rates['usd']['sell'];     if (!$usdrate) {         return '-';     }     return round($value/$usdrate, 8); }  echo getusdrate($singles->price); 

note: declaration of getusdrate function indicates part of class. in case call static function should be:

echo your_class_here::getusdrate($singles->price);