Number formatting_PHP tutorial

I used to use my own defined number formatting method before. It turns out that PHP has always had a number formatting function, haha~
For example, echo number_format(285266237);
Can output 285,266,237
In addition, if you need to format the file byte size, the following method can be used for reference:
function byte_format($input, $dec=0)
{
$prefix_arr = array(" B", "K", "M", "G", "T");
$value = round($input, $dec);
$i=0;
while ($value>1024)
{
$value /= 1024;
$i ;
}
$return_str = round($value, $dec).$prefix_arr[$i];
return $return_str;
}
echo byte_format(285266237);
The displayed result is 272M

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