log1p

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

log1p — 锟斤拷锟斤拷 log(1 + number)锟斤拷锟斤拷锟斤拷锟斤拷 number 锟斤拷值锟接斤拷锟斤拷也锟杰硷拷锟斤拷锟阶既凤拷锟斤拷

说锟斤拷

log1p ( float $number ) : float

log1p() 锟斤拷锟斤拷 log(1 + number)锟斤拷锟斤拷锟斤拷锟斤拷 number 锟斤拷值锟接斤拷锟斤拷也锟杰硷拷锟斤拷锟阶既凤拷锟斤拷锟斤拷 log() might only return log(1) in this case due to lack of precision.

锟斤拷锟斤拷

number

要锟斤拷锟斤拷牟锟斤拷锟�

锟斤拷锟斤拷值

log(1 + number)

锟斤拷锟斤拷锟斤拷志

锟芥本 说锟斤拷
5.3.0 锟剿猴拷锟斤拷锟斤拷锟斤拷锟斤拷平台锟较撅拷锟斤拷锟斤拷

锟轿硷拷

  • expm1() - 锟斤拷锟斤拷 exp(number) - 1锟斤拷锟斤拷锟斤拷锟斤拷 number 锟斤拷值锟接斤拷锟斤拷也锟杰硷拷锟斤拷锟阶既凤拷锟斤拷
  • log() - 锟斤拷然锟斤拷锟斤拷
  • log10() - 锟斤拷 10 为锟阶的讹拷锟斤拷