PHP log1p()用法及代碼示例

log1p() 函數是預定義的 php 數學函數，它返回 log(1+number)。即使 $number 的值接近於零，它的計算也是準確的。

用法:

log1p(number);

參數	描述	必需/可選
Number	指定要處理的數量	Required

<?php
$num=6;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log1p($num);
?>

輸出：

Your number is:6
By using log10() function your number is:1.9459101490553

<?php
$num=(-0.3);
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log1p($num);
?>

輸出：

Your number is:-0.3
By using log10() function your number is:-0.35667494393873

<?php
$num=(2.7183);
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log1p($num);
?>

輸出：

Your number is:2.7183
By using log10() function your number is:1.3132665745863

<?php
$num=0;
echo "Your number is:".$num;
echo "<br>"."By using log10() function your number is:".log1p($num);
?>

輸出：

Your number is:0
By using log10() function your number is:0

相關用法

注：本文由純淨天空篩選整理自 PHP log1p() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。