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< ? php
class ZcNumberHelper {
/**
* 返回当前时间的字符串，
*
* @param integer $dec 精确到小数点后几位
* @return string
*/
public static function microtimeFloat ( $scale = 3 ) {
list ( $usec , $sec ) = explode ( ' ' , microtime ());
return bcadd ( $usec , $sec , $scale );
}
public static function numFormat ( $number , $decimals = 2 ) {
return ( float ) number_format ( $number , $decimals , '.' , '' );
}
public static function percent ( $divisor , $denominator , $symbol = '%' , $decimals = 2 ){
if ( $denominator == 0 && $divisor == 0 ){
return '0' . $symbol ;
}
if ( $denominator == 0 ) {
return '∞' . $symbol ;
}
return self :: numFormat (( $divisor / $denominator ) * 100 , $decimals ) . $symbol ;
}
}